CN105865996A - Device and method for measuring mist distribution uniformity - Google Patents

Abstract

The invention relates to a measuring device and method for the uniformity of fog distribution, which uses a measuring circuit corresponding to the insulator, a data acquisition circuit and a data processing circuit to obtain the phase angle difference between the voltage of the insulator and the voltage of the signal source in the measuring circuit , the upper computer obtains the difference between the corresponding phase angle differences of multiple insulators, and compares the maximum value of each difference with the preset value to determine whether the fog in the area where the multiple insulators are located is uniform. The invention quantitatively judges whether the fog in the area where the insulator is located is uniform by measuring the difference between the voltage on the surface of each insulator and the phase angle difference of the signal source voltage in the corresponding measurement circuit during the damp process, as long as the sampling resistance, sampling capacitance and insulator surface resistance If the matching is appropriate, the voltage of the required signal source can be reduced to reduce the influence of the thermal effect of the current on the measurement result, thereby improving the accuracy of the final judgment result.

Description

Measuring device and method for uniformity of fog distribution

technical field

The invention relates to the technical field of fog measurement, in particular to a measuring device and method for the uniformity of fog distribution.

Background technique

Artificial pollution test is the basis for external insulation selection. Relevant studies have shown that during the artificial pollution test, the degree of dampness of polluted insulators has a significant impact on the dispersion of the final pollution flashover voltage. In the moisture test of polluted insulators, the hot mist is passed into the test tank to make the polluted insulators damp, and the humidification effect of the fog is determined by the uniformity of the distribution of the hot mist into the test tank. In GB/T 4585 AC system artificial pollution test standard, it is required for the input of test tank fog to place the insulator so that the visible fog around it can be as uniform as possible. However, no quantitative judgment method was given.

The current existing method of judging the uniformity of heat mist distribution in the test tank by the leakage current flowing through the dirty layer on the surface of the insulator needs to apply a test voltage of up to a thousand volts on the insulator. Because the high test voltage will cause the leakage current waveform to be distorted, and the thermal effect will dry the dirty layer, thus affecting the final judgment result.

Due to the uneven distribution of the hot mist passing into the fog chamber, the surface of the polluted insulator may be unevenly dampened, resulting in a large difference in the results of different tests, which brings difficulties to the design of the internal and external insulation of the power system.

Contents of the invention

Based on this, it is necessary to provide a device and method for measuring the uniformity of mist distribution in order to solve the existing problem that the uniformity of mist distribution in the test tank cannot be accurately judged.

A measuring device for the uniformity of fog distribution, including an insulator, a measuring circuit, a data acquisition circuit, a data processing circuit and a host computer;

There are multiple insulators, and each insulator is connected to the corresponding measurement circuit, data acquisition circuit and data processing circuit in sequence, and the host computer is connected to each data processing circuit respectively;

The measuring circuit includes a signal source circuit, a sampling capacitor and a sampling resistor, wherein the signal source circuit, the sampling capacitor and the sampling resistor are connected in series in sequence, and the sampling capacitor is connected in parallel with the corresponding insulator;

The data acquisition circuit is used for collecting the voltage output by the signal source circuit in the measurement circuit and the voltage of the sampling capacitor;

The data processing circuit is used for measuring the phase angle difference between the voltage output by the signal source circuit collected by the data acquisition circuit and the voltage of the sampling capacitor;

The upper computer is used to obtain the difference between the corresponding phase angle differences of multiple insulators. When the maximum value of each difference is less than the preset value, it is determined that the fog distribution in the area where multiple insulators are located is uniform.

According to the measuring device of the uniformity of fog distribution above, each insulator is connected with the corresponding measuring circuit, data acquisition circuit and data processing circuit in turn, and the host computer is connected with each data processing circuit respectively; using the measuring circuit corresponding to the insulator, The data acquisition circuit and the data processing circuit are used to obtain the phase angle difference between the voltage of the insulator and the voltage of the signal source in the measurement circuit. The maximum value and the preset value are used to determine whether the fog in the area where multiple insulators are located is uniform. The invention quantitatively judges whether the fog in the area where the insulator is located is uniform by measuring the difference between the voltage on the surface of each insulator and the phase angle difference of the signal source voltage in the corresponding measurement circuit during the damp process, as long as the sampling resistance, sampling capacitance and insulator surface resistance If the matching is appropriate, the voltage of the required signal source can be reduced to reduce the influence of the thermal effect of the current on the measurement result, thereby improving the accuracy of the final judgment result.

A method for measuring the uniformity of fog distribution, comprising the following steps:

Applying a voltage to the target insulator through a measurement circuit, wherein the measurement circuit includes a signal source circuit, a sampling resistor and a sampling capacitor, wherein the signal source circuit, the sampling capacitor and the sampling resistor are connected in series in sequence, and the sampling capacitor is connected in parallel with the target insulator;

Collect the voltage output by the signal source circuit and the voltage of the sampling capacitor;

Measure the phase angle difference between the voltage output by the signal source circuit and the voltage of the sampling capacitor;

Obtain the difference between the corresponding phase differences of multiple target insulators. When the maximum value of each difference is smaller than the preset value, it is determined that the fog distribution in the area where the multiple target insulators are located is uniform.

According to the method for measuring the uniformity of the fog distribution, the measurement circuit applies a voltage to the target insulator, collects and measures the phase angle difference between the voltage output by the signal source circuit in the measurement circuit and the voltage of the sampling capacitor, and obtains a plurality of target insulators. For the difference between two corresponding phase differences, by comparing the maximum value of each difference with the preset value, it is determined whether the fog in the area where the multiple insulators are located is uniform. The invention quantitatively judges whether the fog in the area where the insulators are located is uniform by measuring the difference between the voltage on the surface of multiple target insulators during the damp process and the phase angle difference of the signal source voltage in the corresponding measurement circuit, as long as the sampling resistance, sampling capacitance and insulator If the surface resistance is properly matched, the voltage of the required signal source can be reduced to reduce the influence of the thermal effect of the current on the measurement result, thereby improving the accuracy of the final judgment result.

Description of drawings

Fig. 1 is the structural schematic diagram of the measuring device of the mist distribution uniformity of one of them;

Fig. 2 is the structural representation of the measurement circuit of one embodiment wherein;

Fig. 3 is a partial structural schematic diagram of a measuring device for the uniformity of mist distribution in one embodiment;

Fig. 4 is the concrete structural representation of the measuring system of the mist distribution uniformity of one of them;

Fig. 5 is a schematic flowchart of a method for measuring the uniformity of mist distribution in one embodiment.

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, and do not limit the protection scope of the present invention.

Referring to FIG. 1 , it is a schematic structural diagram of a measuring device for mist distribution uniformity of the present invention. The device for measuring the uniformity of fog distribution in this embodiment includes an insulator 110, a measurement circuit 120, a data acquisition circuit 130, a data processing circuit 140, and a host computer 150;

There are multiple insulators 110, each insulator 110 is connected to the corresponding measurement circuit 120, data acquisition circuit 130 and data processing circuit 140 in sequence, and the host computer 150 is connected to each data processing circuit 140 respectively;

As shown in Figure 2, the measurement circuit 120 includes a signal source circuit 122, a sampling resistor 124 and a sampling capacitor 126, wherein the signal source circuit 122, the sampling capacitor 124 and the sampling resistor 126 are connected in series in sequence, and the sampling capacitor 126 is connected in parallel with the corresponding insulator 110;

The data acquisition circuit 130 is used to collect the voltage output by the signal source circuit 122 and the voltage of the sampling capacitor 126;

The data processing circuit 140 is used to measure the phase angle difference between the voltage output by the signal source circuit 122 and the voltage of the sampling capacitor 126;

The host computer 150 is used to obtain the difference between the corresponding phase angle differences of the plurality of insulators 110. When the maximum value of the differences is smaller than the preset value, it is determined that the fog distribution in the area where the plurality of insulators 110 are located is uniform.

In this embodiment, each insulator 110 is sequentially connected to the corresponding measurement circuit 120, data acquisition circuit 130, and data processing circuit 140, and the host computer 150 is connected to each data processing circuit 140 respectively; 120. The data acquisition circuit 130 and the data processing circuit 140 are used to obtain the phase angle difference between the voltage of the insulator 110 and the signal source voltage in the measurement circuit 120, and the upper computer obtains the corresponding phase angle difference between a plurality of insulators 110. difference, by comparing the maximum value of each difference with the preset value to determine whether the fog in the area where the plurality of insulators 110 are located is uniform. The present invention quantitatively judges whether the fog in the area where the insulators are located is uniform by measuring the difference between the voltage on the surface of each insulator 110 and the phase angle difference of the signal source voltage in the corresponding measurement circuit 120 during the damp process, as long as the sampling resistance, sampling capacitance and insulator If the surface resistance of 110 is properly matched, the voltage of the required signal source can be reduced to reduce the influence of the thermal effect of the current on the measurement result, thereby improving the accuracy of the final judgment result.

In one of the embodiments, as shown in FIG. 3 , the measuring device for the uniformity of mist distribution also includes measuring electrodes, two measuring electrodes 162 and 164 are arranged on the surface of each insulator 110 , and one measuring electrode 162 is connected with the corresponding measuring circuit 120 One end of the sampling capacitor in the measurement circuit 120 is connected to the other end of the sampling capacitor in the corresponding measurement circuit 120 .

In this embodiment, by connecting the measuring electrodes to the insulator, the contact resistance with the insulator can be reduced and the measurement accuracy can be ensured.

In one of the embodiments, the surfaces of all the insulators on which the measuring electrodes are arranged are evenly covered with the same preset salt-dust dense pollution.

In this embodiment, the surface of the insulator is evenly covered with pollution, which can improve the conductivity of the surface of the insulator, and ensure the accuracy of measurement when the voltage of the signal source is low. The preset salt density of dirt can be freely adjusted according to the actual application. The preset salt density of pollution on each insulator is the same, and the uniformity of fog distribution can be judged by comparing the phase angle difference of insulators at different positions under the same pollution degree.

In one embodiment, all the measuring electrodes have the same length, ranging from 10-20 mm, and the distance between the two measuring electrodes corresponding to each insulator is the same, ranging from 2-5 mm.

In this embodiment, since the size of the insulator is generally not too large, the size and position of the measuring electrode will also have a certain impact on the measurement result, so generally in order to reduce the contact resistance and ensure the accuracy of the measurement result, the length of the measuring electrode Set between 10-20 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, etc., the distance between the measuring electrodes on each insulator is set between 2-5 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc. are all available.

In one of the embodiments, there are five insulators.

In this embodiment, there are five insulators, five measuring circuits, data acquisition circuits and data processing circuits, and one upper computer. The positions of the five insulators can be adjusted according to actual needs, and the measurement results can reflect the uniformity of the fog distribution in the area where the five insulators are located.

Preferably, one insulator is the central insulator, and the other four insulators are located around the central insulator, and the lines connecting two adjacent insulators among the four insulators to the central insulator are perpendicular to each other.

The above-mentioned measuring system for the uniformity of fog distribution can be applied in the artificial climate tank of the artificial pollution test to quantitatively judge the uniformity of fog distribution in the artificial climate tank.

In a specific embodiment, each insulator sample can be cleaned with tap water and dried for later use; take 5 clean insulators, and arrange two rectangular copper conductive adhesives with a length of 10 mm and a distance of 2 mm in the middle of the upper surface for measurement. Electrode; the surface of the insulator with the measuring electrode is evenly coated with the same given salt-dust density pollution, and dried in the shade for 24 hours; the polluted insulator is placed in the middle of the artificial climate tank and four positions at 90° angles respectively, And the measurement electrode is connected to the data acquisition module, the data acquisition module is connected with the phase angle difference detection system, and the phase angle difference detection system is connected with the oscilloscope, as shown in Figure 4, the data acquisition module here includes the measurement circuit and data of the present invention The acquisition circuit and the phase angle difference detection system are equivalent to the data processing circuit of the present invention, and the oscilloscope is equivalent to the upper computer of the present invention. During the measurement, turn on the steam boiler connected to the artificial climate tank, pass hot fog into the artificial climate tank, observe the change of the phase angle difference of the five insulators through an oscilloscope, calculate the change rate of the phase angle difference, and judge that the heat fog is evenly distributed The phase angle difference monitoring system can also be connected with the computer (host computer), and the uniformity of the fog distribution in the area where the insulator is located can be judged through computer calculation. The specific distribution positions of the insulators can be adjusted as required.

According to the above-mentioned device for measuring the uniformity of mist distribution, the present invention also provides a method for measuring the uniformity of mist distribution. The embodiments of the method for measuring the uniformity of mist distribution of the present invention will be described in detail below.

Referring to FIG. 5 , it is a schematic flowchart of the method for measuring the uniformity of mist distribution in the present invention. The measuring method of the mist distribution uniformity in this embodiment, comprises the following steps:

Step S101: applying a voltage to the target insulator through the measurement circuit, wherein the measurement circuit includes a signal source circuit, a sampling resistor and a sampling capacitor, wherein the signal source circuit, the sampling capacitor and the sampling resistor are connected in series in sequence, and the sampling capacitor is connected in parallel with the target insulator;

Step S102: collecting the voltage output by the signal source circuit and the voltage of the sampling capacitor;

Step S103: measuring the phase angle difference between the voltage output by the signal source circuit and the voltage of the sampling capacitor;

Step S104: Obtain the difference between the corresponding phase differences of multiple target insulators. When the maximum value of the differences is smaller than the preset value, it is determined that the fog distribution in the area where the multiple target insulators are located is uniform.

In one of the embodiments, the step of applying a voltage to the target insulator through the measuring circuit includes the following steps:

The measuring circuit applies a voltage to the target insulator through two measuring electrodes, wherein the two measuring electrodes are respectively arranged on the surface of the target insulator, one measuring electrode is connected to one end of the sampling capacitor, and the other measuring electrode is connected to the other end of the sampling capacitor.

In one of the embodiments, before the step of applying a voltage to the target insulator through the measuring circuit, the following steps are further included:

The surface of all target insulators provided with two measuring electrodes is evenly covered with the same preset salt-dust dense pollution.

In one embodiment, all the measuring electrodes have the same length, ranging from 10-20 mm, and the distance between the two measuring electrodes corresponding to each target insulator is the same, ranging from 2-5 mm.

The method for measuring the uniformity of fog distribution of the present invention corresponds to the measuring device for uniformity of fog distribution of the present invention, and the technical features and beneficial effects described in the embodiment of the above-mentioned measuring device for uniformity of fog distribution are all applicable to fog distribution Examples of uniformity measurement methods.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (9)

1. A measuring device of fog distribution uniformity, is characterized in that, comprises insulator, measurement circuit, data acquisition circuit, data processing circuit and upper computer; There are multiple insulators, and each insulator is sequentially connected to the corresponding measurement circuit, data acquisition circuit and data processing circuit, and the host computer is respectively connected to each of the data processing circuits; The measurement circuit includes a signal source circuit, a sampling capacitor, and a sampling resistor, wherein the signal source circuit, the sampling capacitor, and the sampling resistor are connected in series in sequence, and the sampling capacitor is connected in parallel with a corresponding insulator; The data acquisition circuit is used to collect the voltage output by the signal source circuit in the measurement circuit and the voltage of the sampling capacitor; The data processing circuit is used to measure the phase angle difference between the voltage output by the signal source circuit collected by the data acquisition circuit and the voltage of the sampling capacitor; The upper computer is used to obtain the difference between the corresponding phase angle differences of a plurality of the insulators, and when the maximum value of each of the differences is smaller than the preset value, it is determined that the area where the plurality of insulators are located is foggy. evenly distributed. 2. the measuring device of mist distribution uniformity according to claim 1, is characterized in that, also comprises measuring electrode, and the surface of each described insulator is provided with two described measuring electrodes, and one described measuring electrode and corresponding measuring electrode One end of the sampling capacitor in the circuit is connected, and the other measuring electrode is connected with the other end of the sampling capacitor in the corresponding measuring circuit. 3. The measuring device for the uniformity of fog distribution according to claim 2, characterized in that, the same preset salt-dust dense pollution is evenly covered on the surface of all insulators provided with the measuring electrodes. 4. The measuring device for uniformity of mist distribution according to claim 2 or 3, characterized in that, all of the measuring electrodes have the same length, and the length range is 10-20 millimeters, between the two measuring electrodes corresponding to each insulator The distance between them is the same, and the distance range is 2-5 mm. 5. The device for measuring the uniformity of mist distribution according to any one of claims 1 to 3, characterized in that there are five insulators. 6. A method for measuring the uniformity of fog distribution, comprising the following steps: A voltage is applied to the target insulator through a measurement circuit, wherein the measurement circuit includes a signal source circuit, a sampling resistor, and a sampling capacitor, wherein the signal source circuit, the sampling capacitor, and the sampling resistor are connected in series in sequence, and the sampling capacitor connected in parallel with the target insulator; Collecting the voltage output by the signal source circuit and the voltage of the sampling capacitor; Measuring the phase angle difference between the voltage output by the signal source circuit and the voltage of the sampling capacitor; Acquiring the difference between the corresponding phase differences of multiple target insulators, and when the maximum value of each of the differences is smaller than a preset value, it is determined that the fog distribution in the area where the multiple target insulators are located is uniform. 7. The method for measuring the uniformity of fog distribution according to claim 6, wherein the step of applying a voltage to the target insulator by the measuring circuit comprises the following steps: The measurement circuit applies a voltage to the target insulator through two measurement electrodes, wherein the two measurement electrodes are respectively arranged on the surface of the target insulator, one of the measurement electrodes is connected to one end of the sampling capacitor, and the other One of the measuring electrodes is connected to the other end of the sampling capacitor. 8. The method for measuring the uniformity of fog distribution according to claim 7, characterized in that, before the step of applying a voltage to the target insulator by the measuring circuit, the following steps are also included: The surfaces of all the target insulators on which the two measuring electrodes are arranged are evenly covered with the same preset salt-dust dense pollution. 9. The method for measuring the uniformity of mist distribution according to claim 7 or 8, characterized in that, all the measuring electrodes have the same length, and the length range is 10-20 mm, and each of the target insulators corresponds to two The distances between the measuring electrodes are all the same, and the distance range is 2-5 mm.