CN103592040B - A kind of temperature monitoring method of generator of nuclear power station stator winding and system - Google Patents

Abstract

The present invention is applicable to the control field of a million-kilowatt pressurized water reactor nuclear power plant, and provides a temperature monitoring method and system for a stator winding of a generator of a nuclear power plant. The operating parameters of the stator bar under the current operating condition are mapped to the outlet water temperature of the stator bar under the generator's reference operating condition by mapping the outlet water temperature of the stator bar under the current operating condition of the generator. Outlet water temperature mapping value of the sub-bar. The method provided by the invention eliminates the influence of generator operating conditions on the outlet water temperature of the stator bars, so that the monitored temperature of each stator bar can more truly and accurately reflect the actual temperature state of each stator bar, and can be timely , Accurately monitor the thermal fault of the generator stator winding.

Description

A temperature monitoring method and system for a stator winding of a nuclear power plant generator

technical field

The invention relates to the control field of a million-kilowatt pressurized water reactor nuclear power plant, in particular to a temperature monitoring method and system for a stator winding of a generator of a nuclear power plant.

Background technique

The generator is a key equipment in a million-kilowatt pressurized water reactor nuclear power plant, and the generator stator winding is the core component of the generator, and the generator stator winding generally includes multiple stator bars. The main problem of generator stator winding is temperature problem. Especially in the field of nuclear power control, because nuclear power plants have extremely high safety requirements, in order to meet the high safety requirements of nuclear power plants, it is necessary to monitor the temperature of the stator windings of generators used in nuclear power plants.

However, the temperature of the stator windings of generators used in nuclear power plants is related to multiple operating parameters such as active power, reactive power, stator current, and inlet temperature of stator cooling water, and is also related to the operating conditions of the generator. In the AC circuit, there are two kinds of electric power supplied by the power supply to the load; one is active power and the other is reactive power. Active power is the electrical power required to keep electrical equipment running normally, that is, the electrical power that converts electrical energy into other forms of energy (such as mechanical energy, light energy, and thermal energy). Reactive power is the electric power used to exchange electric and magnetic fields in a circuit and to establish and maintain a magnetic field in electrical equipment. Reactive power does not do work, but is transformed into other forms of energy.

Due to the ever-changing operating conditions of the generator, correspondingly, it is necessary to monitor the outlet water temperature of the stator bars of the countless generator stator windings corresponding to the various operating conditions of the generator. Therefore, the generator used in nuclear power plants There are many difficulties in monitoring the temperature of the stator winding. And because the temperature of the generator stator winding is related to the operating condition of the generator, the temperature curve of the monitored stator bar will change with the change of the operating condition of the generator, so that the monitored generator stator winding The temperature cannot truly and accurately reflect the actual thermal state of the generator stator winding, which further leads to difficulties in troubleshooting the generator, and brings great safety hazards and economic losses to the nuclear power plant.

Contents of the invention

The invention provides a temperature monitoring method for a generator stator winding of a nuclear power plant to solve the problem that the temperature monitored by the existing temperature monitoring method cannot truly and accurately reflect the actual thermal state of the generator stator winding.

The present invention is achieved in this way, a temperature monitoring method for a stator winding of a nuclear power plant generator, the stator winding of the generator includes several stator bars, and the method includes:

Collecting the operating parameters of the stator bar under the current operating condition of the generator, the operating parameters of the stator bar include the outlet water temperature of the stator bar, the inlet water temperature of the stator bar, the active power of the generator and the reactive power of the generator;

According to the collected operating parameters of the stator bar under the current operating condition of the generator, the collected outlet water temperature of the stator bar under the current operating condition of the generator is mapped to the outlet water temperature of the stator bar under the reference operating condition of the generator, Obtain the outlet water temperature mapping value of the stator bar under the current operating condition of the generator;

Display the outlet water temperature mapping value of the stator bar under the current operating condition of the generator.

Another object of the present invention is to provide a temperature monitoring system for a stator winding of a nuclear power plant generator, the generator stator winding includes several stator bars, and the system includes:

The acquisition unit is used to collect the operating parameters of the stator bar under the current operating condition of the generator. The operating parameters of the stator bar include the outlet water temperature of the stator bar, the inlet water temperature of the stator bar, the active power of the generator and the reactive power;

The mapping unit is used to map the collected outlet water temperature of the stator bar under the current operating condition of the generator to the stator wire under the reference operating condition of the generator according to the collected operating parameters of the stator bar under the current operating condition of the generator. The outlet water temperature of the stator bar is obtained to obtain the mapping value of the outlet water temperature of the stator bar under the current operating condition of the generator;

The display unit is used to display the mapped value of the outlet water temperature of the stator bar under the current operating condition of the generator.

In the present invention, by mapping the collected water outlet temperature of the stator bar under various operating conditions of the generator to the outlet water temperature of the stator bar under the reference operating condition of the generator, the stator temperature of the stator bar under various operating conditions of the generator is obtained. The map value of the outlet water temperature of the wire bar, and display the map value of the outlet water temperature of the stator bar under various operating conditions of the generator, thereby eliminating the influence of the generator operating condition on the outlet water temperature of each stator bar included in the stator winding of the generator The influence of the influence, so that the temperature of each stator bar included in the generator stator winding is more real and accurate to reflect the actual temperature state of each stator bar of the generator stator winding, and the generator stator can be monitored timely and accurately Thermal failure of the winding.

Description of drawings

Fig. 1 is the implementation flowchart of the temperature monitoring method of the stator winding of the nuclear power plant generator provided by the embodiment of the present invention;

Fig. 2 is a structural schematic diagram of a stator winding of a nuclear power plant generator provided by an embodiment of the present invention;

Fig. 3 is a simplified schematic diagram of the series water circuit and the parallel water circuit in Fig. 2 provided by the embodiment of the present invention;

Fig. 4 is a temperature trend comparison diagram of the stator bars obtained during the operation of the nuclear power plant provided by the embodiment of the present invention;

Fig. 5 is an implementation flowchart of a method for monitoring the temperature of a stator winding of a nuclear power plant generator provided by another embodiment of the present invention;

Fig. 6 is a schematic diagram showing the clogging rate of the stator bar provided by the embodiment of the present invention;

Fig. 7 is an implementation flowchart of a method for monitoring the temperature of a stator winding of a nuclear power plant generator provided by another embodiment of the present invention;

Fig. 8 is a schematic diagram of the variation trend of the clogging coefficient over time of some stator bars included in the stator winding of the generator provided by the embodiment of the present invention;

Fig. 9 is a structural block diagram of a temperature monitoring system for a stator winding of a nuclear power plant generator provided by an embodiment of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the embodiment of the present invention, the operating parameters of each stator bar included in the generator stator winding under various operating conditions of the generator are collected, and the collected stator wires included in the generator stator winding under various operating conditions of the generator are collected. The operating parameters of the bars map the outlet water temperature of each stator bar included in the generator stator winding to the outlet water temperature under the generator reference operating condition, thereby eliminating the influence of the generator operating condition on each stator bar included in the generator stator winding The influence of the outlet water temperature makes the monitored temperature of each stator bar included in the generator stator winding more truly and accurately reflect the actual temperature state of each stator bar of the generator stator winding.

In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.

Fig. 1 shows the implementation process of the temperature monitoring method for the stator winding of the nuclear power plant generator provided by the embodiment of the present invention, which is described in detail as follows:

S101. Collect the operating parameters of the stator bar under the current operating condition of the generator.

The operating parameters of the stator bar include, but are not limited to, the outlet water temperature of the stator bar, the inlet water temperature of the stator bar, active power of the generator, reactive power of the generator, and the like.

In this embodiment, collecting the operating parameters of the stator bar under the current operating condition of the generator may be specifically collecting the operating parameters of the stator bar under various operating conditions of the generator.

In this embodiment, the outlet water temperature of each stator bar included in the generator stator winding can be collected through each temperature sensor arranged on the outlet water collection ring of the generator.

Please refer to FIG. 2 , which is a schematic structural diagram of a stator winding of a nuclear power plant generator provided by an embodiment of the present invention. The stator winding of the nuclear power plant generator adopts a three-phase double-layer short-distance distributed winding. Each coil includes two single-turn rod-type bar-shaped bars, which are welded at the end wire lugs to form a complete coil. Each phase winding contains several coils, using 2 branches, and the three phases are connected into a double Y shape. Both the water inlet water collection ring and the water outlet water collection ring of the coil are installed on the steam side of the generator, with a total of 48 water outlets. The waterways of generator stator windings are divided into two categories. The first type is the water branch in series. The cooling water enters from the inlet water collecting ring on the steam side, and after cooling the two stator bars, it gathers to the outlet water collecting ring on the steam side and flows out. There are a total of 36 branches in series. The other type is the parallel water circuit. The cooling water enters from the neutral point or the outgoing line of the excitation side, and after cooling a stator bar, it is collected to the water outlet ring on the steam side and flows out. The parallel water circuit has a total of 12 branches. The temperature sensor can be arranged on the water outlet water collection ring of the generator, and the temperature sensor can collect the outlet water temperature of each stator bar included in the stator winding of the generator. For each stator bar included in the stator winding of the generator, a corresponding temperature sensor can be provided, and the temperature sensor can collect the outlet water temperature of the corresponding stator bar. However, the structure of the stator winding of the nuclear power plant generator shown in Figure 2 is only to provide a structural representation, and the structure of the stator winding of the nuclear power plant generator is not limited to that shown in Figure 2 above, and the structure of the stator winding of the nuclear power plant generator can also be any other structure.

In order to more clearly illustrate the detailed process of collecting the outlet water temperature of each stator bar contained in the stator winding of the generator through the temperature sensor, please refer to Figure 3, which shows the series water circuit and parallel water circuit in Figure 2 provided by the embodiment of the present invention A simplified schematic diagram of . in:

In the parallel water circuit, the cooling water enters from the inlet water collecting ring 11 on the steam side of the generator, cools the two stator bars 12, and then gathers to the outlet water collecting ring 13 on the steam side to flow out. In the parallel water circuit, the temperature sensor used to collect the stator wire rods can be set on the water outlet ring of the generator, and the temperature sensor can collect the temperature of the two stator wire rods 12 cooled in the parallel water circuit and collect them in the steam The outlet water temperature of the stator bar when the side outlet water collecting ring 13.

In the series water circuit, the cooling water enters from the neutral point of the excitation side or the outgoing line, cools a stator bar 12, and collects it to the outlet water collecting ring 13 on the steam side to flow out. In the series water circuit, the temperature sensor used to collect the stator wire rod in the series water circuit can be set on the water outlet ring of the generator, and the temperature sensor can collect the cooling temperature of a stator wire in the series water circuit through the temperature sensor. The outlet water temperature of the stator wire rod when the rod 12 is collected to the steam side outlet water collecting ring 13.

The specific process of collecting the water inlet temperature of each stator bar included in the stator winding of the generator, the active power of the generator, and the reactive power of the generator is an existing technology, and will not be repeated here.

The specific acquisition process of the operating parameters of each stator bar included in the generator stator winding described above is only a specific example provided by the embodiment of the present invention, but the acquisition of the operating parameters of each stator bar included in the generator stator winding The process is not limited to the above example, and any collection method provided by the prior art may also be used to collect the operating parameters of each stator bar included in the generator stator winding under various operating conditions of the generator.

S102, according to the collected operating parameters of the stator bar under the current operating condition of the generator, map the collected outlet water temperature of the stator bar under the current operating condition of the generator to the outlet water temperature of the stator bar under the reference operating condition of the generator temperature, to obtain the mapping value of the outlet water temperature of the stator bar under the current operating condition of the generator.

For the convenience of description, the outlet water temperature of the stator bar obtained through the mapping under the reference operating condition of the generator will be referred to as the stator bar outlet water temperature mapping value in the following.

Among them, the benchmark operating condition of the generator can be set arbitrarily according to the needs. For example, the benchmark operating condition is set to a working condition that meets the following conditions: the active power of the generator is 984 megawatts (MW), the reactive power of the generator is 100MW, and the stator wire The entry temperature of the rod is 43 degrees. The above-mentioned setting of the base operating condition of the generator is only an example, and the setting of the base operating condition of the generator is not limited to the above example.

In this embodiment, according to the operating parameters of the stator bar collected under various operating conditions of the generator, the outlet water temperature of the stator bar collected under each operating condition of the generator is mapped to the reference operation of the generator The specific process of obtaining the outlet water temperature mapping value of the stator bar under the working condition is as follows:

A. Obtain the temperature difference of the stator bar under a certain operating condition of the generator. The temperature difference of the stator bar under a certain operating condition of the generator refers to the difference between the outlet water temperature of the stator bar and the inlet water temperature of the stator bar collected under the operating condition of the generator.

B. Get the power ratio. The power ratio refers to the ratio of the sum of the squares of the generator active power reference value and the generator reactive power reference value to the sum of the squares of the generator active power and generator reactive power collected under a certain operating condition of the generator.

C. The product of the ratio of the temperature difference and power of the stator bar under a certain operating condition of the generator plus the reference value of the inlet water temperature of the stator bar is determined as the outlet water temperature mapping value of the stator bar.

The above mapping process is expressed by formulas as follows. This mapping formula is only one example of mapping. The specific mapping method is not limited to the following mapping formula. The water outlet temperature of the stator bar collected under these operating conditions is mapped to the outlet water temperature of the stator bar under the generator reference operating condition, and the outlet water temperature mapping value of the stator bar is obtained:

${\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>\frac{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, T1 is the outlet water temperature of a stator bar collected under _a certain operating condition of the generator. t ₁ is the water inlet temperature of the stator bar collected under the operating condition of the generator. P ₁ is the active power of the generator collected under this operating condition of the generator. Q ₁ is the reactive power of the generator collected under this operating condition of the generator. T ₂ is the temperature mapping value of the electronic wire rod. t ₂ is the reference value of the stator bar entering water temperature. P ₂ is the generator active power reference value. Q ₂ is the reference value of generator reactive power. Examples are as follows:

Assume that the preset benchmark operating conditions of the generator are: the active power of the generator is 984 megawatts (MW), the reactive power of the generator is 100 MW, and the temperature of the water entering the stator bar is 43 degrees. Under a certain operating condition of the generator, the collected operating parameters of a certain stator bar are as follows: the outlet water temperature of the stator bar is 65°C, the inlet water temperature is 45°C, the active power is 997MW, and the reactive power is 180MW. In this example, P ₂ =984MW, Q ₂ =100MW, t ₂ =43 degrees, T ₁ =65°C, t ₁ =45°C, P ₁ =997MW, Q ₁ =180MW, then use the above-mentioned mapping formula Map the outlet water temperature T ₁ =65°C of a certain stator bar collected under the operating condition of the generator to the outlet water temperature T ₂ of the stator bar under the reference operating condition of the generator as: 43+(65- 45)*(984 ² +100 ² )/(997 ² +180 ² )=62.0617°C. For other operating conditions of the generator and the outlet water temperature of other stator bars included in the stator winding of the generator, the above principle is also used for mapping. Since the outlet water temperature of the stator bar collected under different operating conditions of the generator is mapped to the outlet water temperature of the stator bar under the generator's reference operating condition, the influence of the generator operating condition on the generator stator is eliminated. The influence of the outlet water temperature of each stator bar included in the winding, so that the monitored outlet water temperature of each stator bar included in the generator stator winding can more truly and accurately reflect the actual temperature state of each stator bar of the generator stator winding .

S103, displaying the mapped value of the outlet water temperature of the stator bar under the current operating condition of the generator.

In this embodiment, in order to more intuitively reflect the temperature of each stator bar contained in the stator winding of the generator, a comparison chart can be used to show the changes in the collected stator bar outlet water temperature and the stator bar outlet water temperature mapping value trend. The specific process is as follows:

A temperature trend comparison chart is generated and displayed according to the collected stator bar outlet water temperature and the stator bar outlet water temperature mapping value. Please refer to FIG. 4 , which is a temperature trend comparison diagram of stator bars obtained during operation of a nuclear power plant provided by an embodiment of the present invention, but the temperature trend comparison diagram is not limited to that shown in FIG. 4 .

The temperature trend comparison chart of a certain stator bar shown in Figure 4 includes the collected water outlet temperature of the stator bar within a certain period of time and the mapped value of the outlet water temperature of the stator bar during this period of time, from which it can be intuitively It is known that, according to the temperature trend comparison graph collected in the temperature trend comparison chart, the temperature trend of the outlet water of the stator bar can be judged to be worse than that of the generator at T2. According to the The change trend of the temperature map value of the outlet water temperature of the stator bar in the temperature trend comparison chart can determine that the operating condition of the generator at T2 is worse than that at T1, and the field inspection during the nuclear power plant overhaul found that, The actual working condition of the stator bar in the nuclear power plant is that the operating condition of the generator at T2 is worse than that at T1. Therefore, it has been verified that the outlet water temperature of each stator bar included in the generator stator winding monitored by the above outlet water temperature monitoring method provided by the embodiment of the present invention can more truly and accurately reflect the temperature contained in the generator stator winding used in a nuclear power plant. The actual outlet water temperature of each stator bar provides an accurate analysis reference for generator fault troubleshooting, so that nuclear power plant operators can detect the faults of generators used in nuclear power plants in advance.

In this embodiment, the water outlet temperature of the stator bar collected under various operating conditions of the generator is mapped to the outlet water temperature of the stator bar under the reference operating condition of the generator, thereby eliminating the generator running The influence of working conditions on the outlet water temperature of each stator bar included in the generator stator winding makes the monitored temperature of each stator bar included in the generator stator winding more truly and accurately reflect the temperature of each stator wire of the generator stator winding The actual temperature state of the rod.

Fig. 5 shows the implementation process of the temperature monitoring method of the stator winding of the nuclear power plant generator provided by another embodiment of the present invention, which is described in detail as follows:

S201. Obtain the temperature rise of the mapped value of the outlet water temperature of the stator bar under the initial operating condition of the generator, and the temperature rise of the mapped value of the outlet water temperature of the stator bar under the current operating condition of the generator.

Among them, the temperature rise of the mapped value of the outlet water temperature of the stator bar under the initial operating condition of the generator refers to the temperature of the mapped value of the outlet water temperature of the stator bar under the initial operating condition of the generator relative to the reference value of the inlet water temperature of the stator bar amount of change. The temperature rise of the water outlet temperature map value of the stator bar under the current operating condition of the generator refers to the temperature change of the water outlet temperature map value of the stator bar under the current operating condition of the generator relative to the reference value of the inlet water temperature of the stator bar quantity.

In this embodiment, the specific steps for obtaining the outlet water temperature mapping value of the stator bar under the initial operating condition of the generator are as follows:

A. Collect the operating parameters of the stator bar under the initial operating condition of the generator; the specific steps of collecting are as described above, and will not be repeated here.

B. According to the collected operating parameters of the stator bars under the initial operating conditions of the generator, map the outlet water temperature of the stator bars collected under the initial operating conditions of the generator to the stator bar under the reference operating conditions of the generator The outlet water temperature of the wire rod is obtained from the mapping value of the outlet water temperature of the stator wire rod under the initial operating condition of the generator; the specific process of mapping is as described above, and will not be repeated here.

C. Determine the difference between the water outlet temperature mapping value of the stator bar under the initial operating condition of the generator and the water inlet temperature reference value of the stator bar as the temperature rise of the water outlet temperature mapping value under the initial operating condition of the generator.

The specific steps to obtain the outlet water temperature mapping value of the stator bar under the current operating condition of the generator are as follows:

A. Collect the operating parameters of the stator bar under the current operating condition of the generator;

B. According to the collected operating parameters of the stator bar under the current operating condition of the generator, map the outlet water temperature of the stator bar under the current operating condition of the generator collected to the stator bar under the reference operating condition of the generator The outlet water temperature of the wire rod is obtained to obtain the mapping value of the outlet water temperature of the stator wire rod under the current operating condition of the generator;

C. Determine the difference between the mapped value of the outlet water temperature of the stator bar under the current operating condition of the generator and the reference value of the inlet water temperature of the stator bar as the temperature rise of the mapped value of the outlet water temperature under the current operating condition of the generator.

S202. Determine the clogging rate of the stator bar according to the temperature rise of the mapped value of the outlet water temperature of the stator bar under the initial operating condition of the generator and the temperature rise of the mapped value of the outlet water temperature of the stator bar under the current operating condition of the generator. The specific process is as follows:

The difference between the temperature rise of the water outlet temperature mapping value of the stator bar under the current operating condition of the generator and the temperature rise of the water outlet temperature mapping value of the stator bar under the initial operating condition of the generator and the initial operating condition of the generator The ratio of the temperature rise of the outlet water temperature map value of the stator bar is determined as the clogging rate of the stator bar. Expressed in formula as follows:

$\mathrm{<span\; class="notranslate">\; B</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;</span>}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; \&Delta;</span>}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}}{\mathrm{<span\; class="notranslate">\; \&Delta;</span>}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}<span\; class="notranslate">\; \%</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Where B is the blockage rate of the stator bar. ΔT _r is the temperature rise of the outlet water temperature mapping value of the stator bar under the current operating condition of the generator. ΔT _p is the temperature rise of the outlet water temperature mapping value of the stator bar under the initial operating condition of the generator.

In another embodiment of the present invention, the following formula (3) can also be used to determine the clogging rate of the stator bar:

$\mathrm{<span\; class="notranslate">\; B</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}<span\; class="notranslate">\; \%</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Where B is the blockage rate of the stator bar. T _r2 is the mapping value of the outlet water temperature of the stator bar under the current operating condition of the generator. T _p2 is the mapping value of the outlet water temperature of the stator bar under the initial operating condition of the generator. t ₂ is the reference value of the stator bar entering water temperature.

In another embodiment of the present invention, the method also includes the following steps:

Displays the clogging rate for each stator bar.

In this embodiment, various methods provided by the prior art may be used to display the clogging rate of each stator bar, such as using a column graph and the like. Please refer to Figure 6, which is a schematic diagram of the clogging rate of each stator bar provided by the embodiment of the present invention. 6 is shown as a limit.

In the schematic diagram of the clogging rate of each stator bar shown in Figure 6, the operating margin of each stator bar included in the stator winding of the generator can be accurately and intuitively known, and the heat of the stator bar can be quickly and intuitively grasped. state.

In the embodiment of the present invention, by obtaining the temperature rise of the mapped value of the outlet water temperature of the stator bar under the initial operating condition of the generator, and the temperature rise of the mapped value of the outlet water temperature of the stator bar under the current operating condition of the generator, The clogging rate of each stator bar can be determined according to the temperature rise of the mapped value of the outlet water temperature of the stator bar under the initial operating condition of the generator and the temperature rise of the mapped value of the outlet water temperature of the stator bar under the current operating condition of the generator , so that nuclear power plant operators can accurately and intuitively know the operating margin of each stator bar included in the stator winding of the generator according to the blockage rate of each stator bar displayed, so as to timely discover and troubleshoot generators used in nuclear power plants Faults provide a strong reference.

Fig. 7 shows the implementation process of the temperature monitoring method of the stator winding of the nuclear power plant generator provided by another embodiment of the present invention, which is described in detail as follows:

S301. Collect the operating parameters of the stator bar in different time periods. The operating parameters of the stator bar include, but are not limited to, the outlet water temperature of the stator bar, the inlet water temperature of the stator bar, active power of the generator, reactive power of the generator, and the like. The specific collection method is as described above, and will not be repeated here.

S302. Determine the clogging coefficient of the stator bar in the corresponding time period according to the collected operating parameters of the stator bar in different time periods. The specific process is as follows:

The ratio of the collected temperature rise of the stator bar to the sum of the squares of the active power of the generator and the reactive power of the generator in a certain period of time is determined as the clogging coefficient of the stator bar in the period of time. The temperature rise of the stator bar within a certain period of time refers to the difference between the outlet water temperature of the stator bar within the period and the temperature of the water entering the stator bar during the period. Among them, the ratio of the temperature rise of the stator bar collected within a certain period of time to the sum of the squares of the active power of the generator and the reactive power of the generator is determined as the blockage coefficient of the stator bar within this period of time, and the formula is expressed as follows:

${\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

Where K _b is the blocking coefficient of the stator bar. T ₁ is the outlet water temperature of the stator bar. t ₁ is the temperature of the water entering the stator bar. P ₁ is the active power of the generator. Q ₁ is the reactive power of the generator.

In another embodiment of the present invention, the method also includes the following steps:

Shows the clogging coefficient of the stator bars for different time periods. The specific presentation manner may adopt any manner provided by the prior art. Please refer to FIG. 8 , which is a schematic diagram of the variation trend of the clogging coefficient of some stator bars included in the stator winding of the generator with time according to an embodiment of the present invention. From the changing trend of the clogging coefficient of the stator bar with time shown in Figure 8, the clogging situation of the stator bar can be intuitively and accurately known. 1. Accurately know that the clogging coefficient of the stator bar corresponding to the temperature sensor 083MT increases slowly over time, therefore, it can be determined that the clogging condition of the stator bar corresponding to the temperature sensor 083MT is intensified as time goes by.

In this embodiment, the clogging coefficient of the stator bar in the corresponding time period is determined according to the collected operating parameters of the stator bar in different time periods, so that the nuclear power plant operator can intuitively and quickly know the stator wires contained in the generator stator winding The clogging tendency of the rods and the increased clogging of the individual stator bars.

In another embodiment of the present invention, in accordance with the temperature monitoring method of the generator stator winding shown in Fig. 1, Fig. 5 or Fig. 7, the change trend of the outlet water temperature mapping value of the stator bar and the clogging rate of the stator bar are monitored. , When the transformation trend of the clogging coefficient of the stator bar, the method also includes the following steps:

According to one or more combinations of the change trend of the outlet water temperature mapping value of the stator bar, the clogging rate of the stator bar, and the transformation trend of the clogging coefficient of the stator bar, the abnormal stator bar in the stator winding of the generator is detected.

In this embodiment, when detecting an abnormal stator bar in the stator winding of the generator according to the changing trend of the mapped value of the outlet water temperature of the stator bar, the detection can be performed in the following manner:

When the displayed water outlet temperature map value of the stator bar continues to rise, it is detected that the stator bar is abnormal. At the same time, according to the start time and end time of the continuous rise of the displayed water outlet temperature map value of the stator bar, the abnormal time period of the stator bar can be detected. By analyzing the various operations performed by the generator during the time period when the stator bar is abnormal, the cause of the abnormality of the stator bar can be known, so that not only the stator coil included in the stator winding of the generator can be monitored as early as possible. The abnormality of the wire rod can be checked, and the cause of the abnormality of the stator wire rod can be checked out, which brings great convenience to the maintenance of the generator used in the nuclear power plant, and fully meets the high safety requirements of the nuclear power plant for the generator.

In another embodiment of the present invention, when detecting abnormal stator bars in the stator winding of the generator according to the clogging rate of the stator bars, the detection can be performed in the following manner:

When the clogging rate of the displayed stator bar exceeds a preset threshold, it is detected that the stator bar is abnormal. In this embodiment, the clogging rate of each stator bar can also be compared, so that the specific clogging degree of each stator bar can be intuitively known, thereby obtaining the operating margin of each stator bar, which is useful for nuclear power plant equipment maintenance and Replacement is provided for reference.

In another embodiment of the present invention, when detecting abnormal stator bars in the generator stator winding according to the transformation trend of the blockage coefficient of the stator bars, the detection can be performed in the following manner:

When the clogging coefficient of the displayed stator bar increases slowly with time, it is detected that the clogging degree of the stator bar is increasing with time.

In this embodiment, the generator stator can be detected according to one or more combinations of the changing trend of the map value of the outlet water temperature of the stator bar, the clogging rate of the stator bar, and the transformation trend of the clogging coefficient of the stator bar. Abnormal stator bars appear in the winding, so that the nuclear power plant operator can intuitively, accurately and quickly know the thermal state of the stator winding of the generator used in the nuclear power plant, and ensure the safety of the generator used in the nuclear power plant.

Fig. 9 shows the structure of the temperature monitoring system for the stator winding of the nuclear power plant generator provided by the embodiment of the present invention. For the convenience of description, only the parts related to the embodiment of the present invention are shown. The generator stator winding includes several stator bars. in:

The collection unit 1 collects the operating parameters of the stator bar under the current operating condition of the generator. The operating parameters of the stator bar include the outlet water temperature of the stator bar, the inlet water temperature of the stator bar, the active power of the generator and the reactive power of the generator.

In this embodiment, the outlet water temperature of each stator bar included in the generator stator winding can be collected through each temperature sensor arranged on the outlet water collection ring of the generator.

The mapping unit 2 maps the collected outlet water temperature of the stator bar under the current operating condition of the generator to the temperature of the stator bar under the reference operating condition of the generator according to the collected operating parameters of the stator bar under the current operating condition of the generator. The temperature of the outlet water is used to obtain the mapping value of the outlet water temperature of the stator bar under the current operating condition of the generator.

Among them, the benchmark operating condition of the generator can be set arbitrarily according to the needs. For example, the benchmark operating condition is set to a working condition that meets the following conditions: the active power of the generator is 984 megawatts (MW), the reactive power of the generator is 100MW, and the stator wire The entry temperature of the rod is 43 degrees.

The mapping unit 2 includes a temperature difference acquisition module 21 , a power ratio acquisition module 22 and a mapping value determination module 23 . in:

The temperature difference acquisition module 21 acquires the temperature difference of the stator bar under the current operating condition of the generator. The temperature difference of the stator bar under the current operating condition of the generator is the collected difference between the outlet water temperature of the stator bar and the inlet water temperature of the stator bar under the current operating condition of the generator.

The power ratio acquisition module 22 acquires the power ratio. The power ratio is the ratio of the sum of the squares of the active power reference value of the generator and the reactive power reference value of the generator to the collected square sum of the active power of the generator and the reactive power of the generator under the current operating condition of the generator.

The mapping value determination module 23 determines the product of the ratio of the temperature difference and power of the stator bar under the current operating condition of the generator plus the reference value of the inlet water temperature of the stator bar as the mapping value of the outlet water temperature of the stator bar under the current operating condition of the generator .

The above mapping process can be expressed by the above formula (1).

The temperature display unit 3 displays the map value of the outlet water temperature of the stator bar under the current operating condition of the generator.

In another embodiment of the present invention, the system further includes a temperature rise acquisition unit 4 and a blockage rate acquisition unit 5 . in:

The temperature rise acquisition unit 4 acquires the temperature rise of the mapped value of the outlet water temperature of the stator bar under the initial operating condition of the generator, and the temperature rise of the mapped value of the outlet water temperature of the stator bar under the current operating condition of the generator.

Wherein, the temperature rise of the mapped value of the outlet water temperature of the stator bar under the initial operating condition of the generator refers to the temperature of the mapped value of the outlet water temperature of the stator bar under the initial operating condition of the generator relative to the reference value of the inlet water temperature of the stator bar amount of change. The temperature rise of the outlet water temperature mapping value of the stator bar under the current operating condition of the generator refers to the temperature change of the outlet water temperature mapping value of the stator bar under the current operating condition of the generator relative to the inlet water temperature reference value of the stator bar quantity.

The temperature rise acquisition unit 4 includes a first temperature rise acquisition module 41 . The first temperature rise acquisition module 41 is used to determine the difference between the outlet water temperature map value of the stator bar under the initial operating condition of the generator and the reference value of the inlet water temperature of the stator bar as the outlet water temperature under the initial operating condition of the generator Temperature rise of mapped values.

The temperature rise acquisition unit 4 also includes a second temperature rise acquisition module 42 . The second temperature rise acquisition module 42 determines the difference between the stator bar outlet water temperature mapping value and the stator bar inlet water temperature reference value under the current generator operating condition as the stator bar outlet water temperature map under the current generator operating condition value of temperature rise.

The clogging rate acquisition unit 5 determines the clogging rate of the stator bar according to the temperature rise of the mapped value of the outlet water temperature of the stator bar under the initial operating condition of the generator and the temperature rise of the mapped value of the outlet water temperature of the stator bar under the current operating condition of the generator .

The clogging rate acquisition unit 5 is specifically used to compare the temperature rise of the mapped value of the outlet water temperature of the stator bar under the current operating condition of the generator with the temperature rise of the mapped value of the outlet water temperature of the stator bar under the initial operating condition of the generator. The ratio of the temperature rise of the difference and the temperature rise of the stator bar's outlet water temperature map value under the initial operating condition of the generator is determined as the clogging rate of the stator bar. This process can be expressed by the above formula (2) or (3).

In another embodiment of the present invention, the system also includes:

The clogging rate display unit 6 displays the clogging rate of each stator bar.

In another embodiment of the present invention, the system further includes a blockage coefficient acquisition unit 7 . The clogging coefficient acquisition unit 7 determines the clogging coefficient of the stator bar in a corresponding time period according to the collected operating parameters of the stator bar in different time periods.

The blockage coefficient acquisition unit 7 is specifically used to determine the ratio of the collected temperature rise of the stator bar within a certain period of time to the sum of the squares of the active power of the generator and the reactive power of the generator as the blockage of the stator bar within the period of time coefficient, the temperature rise of the stator bar within a certain period of time refers to the difference between the water outlet temperature of the stator bar within the time period and the water inlet temperature of the stator bar within the time period. This process can be expressed by the above formula (4).

In another embodiment of the present invention, the system further includes a clogging coefficient display unit 8 . The clogging coefficient display unit 8 displays the clogging coefficients of the stator bars in different time periods.

In another embodiment of the present invention, the system further includes an abnormality detection unit 9 . The abnormality detection unit 9 detects abnormality in the stator winding of the generator according to one or more combinations of the change trend of the outlet water temperature map value of the stator bar, the clogging rate of the stator bar, and the conversion trend of the clogging coefficient of the stator bar. stator bar.

Those of ordinary skill in the art can understand that the various units and modules included in the above-mentioned embodiments are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be realized; in addition, each functional unit and The specific names of the modules are only for the convenience of distinguishing each other, and are not used to limit the protection scope of the present invention.

In the embodiment of the present invention, the outlet water temperature of each stator bar included in the generator stator winding is mapped to the generator reference operation by using the operating parameters of each stator bar included in the generator stator winding under various operating conditions of the generator The outlet water temperature under working conditions, thus eliminating the influence of generator operating conditions on the outlet water temperature of each stator bar included in the generator stator winding, making the monitored temperature of each stator bar included in the generator stator winding more realistic , Accurately reflect the actual temperature state of each stator bar of the generator stator winding.

Those of ordinary skill in the art can also understand that all or part of the steps in the method of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, so The storage medium mentioned above includes ROM/RAM, magnetic disk, optical disk, etc.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement or improvement made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (23)

1. a temperature monitoring method for generator of nuclear power station stator winding, described generator unit stator winding comprises some stator bars, it is characterized in that, described method comprises:

Gather the operational factor of stator bar under generator current operating condition, the operational factor of described stator bar comprise the leaving water temperature of stator bar, stator bar enter coolant-temperature gage, generator active power and generator reactive power;

According to the operational factor of stator bar under the current operating condition of generator gathered, the leaving water temperature of stator bar under current for the generator collected operating condition is mapped as the leaving water temperature of stator bar under generator benchmark operating condition, obtains the leaving water temperature mapping value of stator bar under the current operating condition of generator;

Show the leaving water temperature mapping value of stator bar under the current operating condition of described generator;

Wherein, the operational factor of stator bar under the described current operating condition of generator according to gathering, the leaving water temperature of stator bar under current for the generator collected operating condition is mapped as the leaving water temperature of stator bar under generator benchmark operating condition, obtain the leaving water temperature mapping value of stator bar under the current operating condition of generator, specifically comprise:

The temperature difference of stator bar under the current operating condition of acquisition generator, under the current operating condition of described generator, the temperature difference of stator bar is the leaving water temperature of stator bar and the difference entering coolant-temperature gage of stator bar under the current operating condition of generator collected;

Obtain the ratio of power, the ratio of described power is the quadratic sum of generator active power reference value and generator reactive power reference value, with the ratio of the quadratic sum of generator active power and generator reactive power under the current operating condition of the generator collected;

By the temperature difference of stator bar under current for generator operating condition and the ratio of power is long-pending adds that stator bar enters the leaving water temperature mapping value that coolant-temperature gage reference value is defined as stator bar under the current operating condition of generator.

2. the method for claim 1, is characterized in that, the leaving water temperature of stator bar under the current operating condition of described collection generator, specifically comprises:

The leaving water temperature of stator bar under the current operating condition of generator is gathered by being arranged at temperature sensor on the water outlet collecting ring of generator.

3. the method for claim 1, is characterized in that, described method also comprises:

Obtain the temperature rise of the leaving water temperature mapping value of stator bar under generator initial launch operating mode, and the temperature rise of the leaving water temperature mapping value of stator bar under the current operating condition of generator;

According to the plugging rate of the temperature rise determination stator bar of the leaving water temperature mapping value of stator bar under the temperature rise of the leaving water temperature mapping value of stator bar under generator initial launch operating mode and the current operating condition of generator.

4. method as claimed in claim 3, is characterized in that, the temperature rise of the leaving water temperature mapping value of stator bar under acquisition generator initial launch operating mode, specifically comprises:

The operational factor of stator bar under collection generator initial launch operating mode;

According to the operational factor of stator bar under the generator initial launch operating mode collected, the leaving water temperature of stator bar under the generator initial launch operating mode collected is mapped as the leaving water temperature of stator bar under generator benchmark operating condition, obtains the leaving water temperature mapping value of stator bar under generator initial launch operating mode;

The difference leaving water temperature mapping value of stator bar under generator initial launch operating mode and stator bar being entered coolant-temperature gage reference value is defined as the temperature rise of the leaving water temperature mapping value of stator bar under generator initial launch operating mode.

5. method as claimed in claim 3, it is characterized in that, the temperature rise of the leaving water temperature mapping value of stator bar under the current operating condition of described generator, specifically comprises:

The operational factor of stator bar under the current operating condition of collection generator;

According to the operational factor of stator bar under the current operating condition of the generator collected, the leaving water temperature of stator bar under current for the generator collected operating condition is mapped as the leaving water temperature of stator bar under generator benchmark operating condition, obtains the leaving water temperature mapping value of stator bar under the current operating condition of generator;

The difference leaving water temperature mapping value of stator bar under current for generator operating condition and stator bar being entered coolant-temperature gage reference value is defined as the temperature rise of the leaving water temperature mapping value of stator bar under the current operating condition of generator.

6. method as claimed in claim 3, it is characterized in that, the plugging rate of the temperature rise determination stator bar of the leaving water temperature mapping value of stator bar under the described temperature rise according to the leaving water temperature mapping value of stator bar under generator initial launch operating mode and the current operating condition of generator, specifically comprises:

The ratio of the temperature rise of the leaving water temperature mapping value of stator bar under the difference of the temperature rise of the leaving water temperature mapping value of stator bar under the temperature rise of the leaving water temperature mapping value of stator bar under current for generator operating condition and generator initial launch operating mode and generator initial launch operating mode is defined as the plugging rate of stator bar.

7. method as claimed in claim 3, it is characterized in that, described method also comprises:

Show the plugging rate of each stator bar.

8. the method as described in claim as arbitrary in claim 1 to 7, is characterized in that, described method also comprises:

Gather the operational factor of different time sections inner stator line rod;

The damage factor of corresponding time period inner stator line rod is determined according to the operational factor of the different time sections inner stator line rod gathered.

9. method as claimed in claim 8, is characterized in that, the operational factor of the described different time sections inner stator line rod according to gathering is determined specifically to comprise the damage factor of corresponding time period inner stator line rod:

By the temperature rise of certain time period inner stator line rod of collection, be defined as the damage factor of described time period inner stator line rod with the ratio of the quadratic sum of generator active power and generator reactive power, the temperature rise of certain time period inner stator line rod described refers to the leaving water temperature of described time period inner stator line rod and the difference entering coolant-temperature gage of described time period inner stator line rod.

10. method as claimed in claim 8, it is characterized in that, described method also comprises:

Show the damage factor of the stator bar in different time sections.

11. methods as claimed in claim 10, it is characterized in that, described method also comprises the steps:

Abnormal stator bar is there is according in one or more combine detection generator unit stator windings in the conversion trend of the variation tendency of the leaving water temperature mapping value of stator bar, the plugging rate of stator bar, the damage factor of stator bar.

Method as described in 12. claims as arbitrary in claim 1 to 7, it is characterized in that, described generator benchmark operating condition is as follows: it is 43 degree that stator bar enters coolant-temperature gage reference value, and generator active power reference value is 984 megawatts, and generator reactive power reference value is 100 megawatts.

The temperature monitoring system of 13. 1 kinds of generator of nuclear power station stator winding, described generator unit stator winding comprises some stator bars, it is characterized in that, described system comprises:

Collecting unit, for gathering the operational factor of stator bar under the current operating condition of generator, the operational factor of described stator bar comprise the leaving water temperature of stator bar, stator bar enter coolant-temperature gage, generator active power and generator reactive power;

Map unit, for the operational factor according to stator bar under the current operating condition of generator gathered, the leaving water temperature of stator bar under current for the generator collected operating condition is mapped as the leaving water temperature of stator bar under generator benchmark operating condition, obtains the leaving water temperature mapping value of stator bar under the current operating condition of generator;

Temperature display unit, for showing the leaving water temperature mapping value of stator bar under the current operating condition of described generator;

Wherein, described map unit comprises:

Temperature difference acquisition module, for obtaining the temperature difference of stator bar under the current operating condition of generator, under the current operating condition of described generator, the temperature difference of stator bar is the leaving water temperature of stator bar and the difference entering coolant-temperature gage of stator bar under the current operating condition of generator collected;

Power ratio acquisition module, for obtaining the ratio of power, the ratio of described power is the quadratic sum of generator active power reference value and generator reactive power reference value, with the ratio of the quadratic sum of generator active power and generator reactive power under the current operating condition of the generator collected;

Mapping value determination module, for by the temperature difference of stator bar under current for generator operating condition and the ratio of power is long-pending adds that stator bar enters the leaving water temperature mapping value that coolant-temperature gage reference value is defined as stator bar under the current operating condition of generator.

14. systems as claimed in claim 13, it is characterized in that, described system also comprises:

Temperature rise acquiring unit, for obtaining the temperature rise of the leaving water temperature mapping value of stator bar under generator initial launch operating mode, and the temperature rise of the leaving water temperature mapping value of stator bar under the current operating condition of generator;

Plugging rate acquiring unit, for the plugging rate according to the temperature rise determination stator bar of the leaving water temperature mapping value of stator bar under the temperature rise of the leaving water temperature mapping value of stator bar under described generator initial launch operating mode and the current operating condition of generator.

15. systems as claimed in claim 14, it is characterized in that, described temperature rise acquiring unit comprises:

First temperature rise acquisition module, the difference for the leaving water temperature mapping value of the stator bar under generator initial launch operating mode and stator bar being entered coolant-temperature gage reference value is defined as the temperature rise of the leaving water temperature mapping value under generator initial launch operating mode.

16. systems as claimed in claim 14, it is characterized in that, described temperature rise acquiring unit also comprises:

Second temperature rise acquisition module, the difference for the leaving water temperature mapping value of stator bar under current for generator operating condition and stator bar being entered coolant-temperature gage reference value is defined as the temperature rise of the leaving water temperature mapping value of stator bar under the current operating condition of generator.

17. systems as claimed in claim 14, it is characterized in that, described plugging rate acquiring unit is defined as the plugging rate of stator bar specifically for the ratio of the temperature rise of the leaving water temperature mapping value of the stator bar under the difference of the temperature rise of the leaving water temperature mapping value of the stator bar under the temperature rise of the leaving water temperature mapping value by the stator bar under current for generator operating condition and generator initial launch operating mode and generator initial launch operating mode.

18. systems as claimed in claim 14, it is characterized in that, described system also comprises:

Plugging rate display unit, for showing the plugging rate of each stator bar.

System as described in 19. claims as arbitrary in claim 13 to 18, it is characterized in that, described system also comprises:

Damage factor acquiring unit, for determining the damage factor of corresponding time period inner stator line rod according to the operational factor of the different time sections inner stator line rod gathered.

20. systems as claimed in claim 19, it is characterized in that, described damage factor acquiring unit is specifically for being defined as the damage factor of described time period inner stator line rod by the ratio of the temperature rise of certain time period inner stator line rod gathered and the quadratic sum of generator active power and generator reactive power, the temperature rise of certain time period inner stator line rod described refers to the leaving water temperature of described time period inner stator line rod and the difference entering coolant-temperature gage of described time period inner stator line rod.

21. systems as claimed in claim 19, it is characterized in that, described system also comprises:

Damage factor display unit, for showing the damage factor of the stator bar in different time sections.

22. systems as claimed in claim 19, it is characterized in that, described system also comprises:

, for there is abnormal stator bar in one or more combine detection generator unit stator windings in the conversion trend of the variation tendency of the leaving water temperature mapping value according to stator bar, the plugging rate of stator bar, the damage factor of stator bar in abnormality detecting unit.

System as described in 23. claims as arbitrary in claim 13 to 18, it is characterized in that, described generator benchmark operating condition is as follows: it is 43 degree that stator bar enters coolant-temperature gage reference value, and generator active power reference value is 984 megawatts, and generator reactive power reference value is 100 megawatts.