CN114781133A - A design method of vacuum interrupter based on multi-dimensional analysis - Google Patents

Abstract

The invention discloses a method for designing a vacuum interrupter based on multi-dimensional analysis. He Baoguang Co., Ltd. carries out electric field calculation for the double-section ceramic shell arc extinguishing chamber, and simulates the electric field of the arc extinguishing chamber respectively by applying voltage; according to the electric field calculation results and simulation results, select the vacuum arc extinguishing chamber, and calculate the parameters for the vacuum arc extinguishing chamber. Carry out the final assembly design; set the limit value, carry out the X-ray test on the vacuum interrupter, if the test result does not meet the limit value requirement, adjust the reading of the radiation instrument until the requirement is met; Life analysis, process performance analysis and other dimensions are analyzed to provide a basis for the design of the vacuum interrupter. The designed vacuum interrupter meets the high technical performance requirements.

Description

A design method of vacuum interrupter based on multi-dimensional analysis

technical field

The invention relates to the technical field of vacuum interrupters, in particular to a method for designing a vacuum interrupter based on multi-dimensional analysis.

Background technique

Based on the extremely high reliability and high technical performance requirements of converter transformers, higher requirements are put forward for the design and manufacture of vacuum interrupters.

From the analysis of product electrical life, mechanical life, type test, etc., the development of vacuum interrupter has the following design difficulties: Difficulty 1: Under the conditions of rated voltage 6kV and rated current 1300A, the electrical life requirement is as high as 360,000 times. Difficulty 2: The mechanical life requirement under the rated distance of 5.5mm is as high as 1.5 million times, and the mechanical life test conditions are harsh 1 time/5s. Difficulty 3: The type test conditions are severe and the test is very difficult. Due to the long electrical life, long mechanical life, harsh type test conditions and the particularity of the product application, the product has extremely high requirements on the reliability of the vacuum interrupter. The product needs to be broken through in terms of structural design, performance parameters, material characteristics, process guarantee and other aspects.

SUMMARY OF THE INVENTION

The purpose of this section is to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the application to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions should not be used to limit the scope of the invention.

The present invention has been proposed in view of the above-mentioned existing problems.

In order to solve the above-mentioned technical problems, the present invention provides the following technical solutions, which include: the Siemens single-section porcelain shell arc-extinguishing chamber, the Siemens double-section porcelain-shell arc-extinguishing chamber, the Baoguang Co., Ltd. The electric field is calculated for the arc-extinguishing chamber of the ceramic shell, and the electric field simulation of the arc-extinguishing chamber is carried out respectively by applying voltage; the vacuum arc-extinguishing chamber is selected according to the electric field calculation results and simulation results, and the general assembly design of the vacuum arc-extinguishing chamber is carried out through the calculation parameters; setting If the test results do not meet the limit requirements, adjust the reading of the radiation instrument until the requirements are met.

As a preferred solution of the multi-dimensional analysis-based vacuum interrupter design method of the present invention, the electric field calculation includes: the strongest electric field and position of each arc interrupter when the static end is applied with a high voltage of 20kV are: Siemens single Arc interrupter of section ceramic shell: 8.8453e+6V/m, edge of moving contact; Baoguang single-section ceramic shell interrupter: 7.7360e+6V/m, edge of movable contact; Siemens double-section ceramic shell arc interrupter : 1.6024e+7V/m, static ceramic seal; Baoguang Co., Ltd. double-section ceramic shell arc extinguishing chamber: 1.0270e+7V/m, dynamic ceramic seal; the strongest electric field and position of each arc extinguishing chamber when 20kV high voltage is applied to the moving end They are: Siemens single-section porcelain shell arc interrupter: 8.8460e+6V/m, edge of moving contact; Baoguang single-section porcelain shell arc-extinguishing chamber: 7.7370e+6V/m, moving contact edge; Siemens double-section Porcelain shell arc interrupter: 1.4648e+7V/m, movable porcelain seal; Baoguang double-section porcelain shell arc interrupter: 7.7837e+6V/m, movable porcelain seal.

As a preferred solution of the multi-dimensional analysis-based vacuum interrupter design method according to the present invention, the method includes: adding 60kV high voltage to the static end and 60kV high voltage to the dynamic end respectively, performing electric field simulation of the arc interrupter, and obtaining the electric field distributed.

As a preferred solution of the multi-dimensional analysis-based vacuum interrupter design method of the present invention, the assembly design includes contact design, shielding system design, bellows design and ceramic shell design; wherein, the material of the contact For copper-chromium alloy, choose 316L for bellows material.

As a preferred solution of the multi-dimensional analysis-based vacuum interrupter design method of the present invention, it includes: processing technology: hydroforming of thin-walled welded pipes.

As a preferred solution of the multi-dimensional analysis-based vacuum interrupter design method of the present invention, wherein: the X-ray test includes: installing the vacuum interrupter on a test positioning bracket, and the contacts are separated at a specified minimum contact When the distance and the radiation instrument are in place, the rated voltage Ur is applied to both ends of the contact. After the shortest 15s, the radiation level of the radiation instrument is read; the voltage at both ends of the contact is raised to the rated power frequency withstand voltage Ud, after the shortest After 15s, read the radiation level on the radiation instrument.

As a preferred solution of the multi-dimensional analysis-based vacuum interrupter design method according to the present invention, the limit requirements include: the X-ray emitted by the vacuum interrupter does not exceed the following limit: under the rated voltage Ur 5μSv per hour at 1m; 150μSv per hour at 1m at rated power frequency withstand voltage Ud.

As a preferred solution of the multi-dimensional analysis-based vacuum interrupter design method according to the present invention, it includes: the sensing element of the radiation instrument is located in the separated contact plane and the outer surface closest to the vacuum interrupter 1m.

As a preferred solution of the vacuum interrupter design method based on multi-dimensional analysis according to the present invention, it includes: if the test result does not meet the limit requirements and the electrical safety requires that the radiation instrument is located at a distance of more than 1m, according to The inverse square law adjusts the reading R(1m) of the radiation instrument as follows:

R(1m)=R(d)·d ²

where R(d) is the radiation level measured at a distance d from the surface of the vacuum interrupter.

Beneficial effects of the present invention: the present invention analyzes from multiple dimensions such as electric field analysis, material performance analysis, bellows life analysis, process performance analysis, etc., to provide a basis for the design of vacuum interrupters, and the designed vacuum interrupters meet high-tech performance Require.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort. in:

Fig. 1 is the schematic diagram of the electric field simulation result of the XMZ-D static end plus the high voltage 60kV of the vacuum interrupter design method according to the first embodiment of the present invention;

2 is a schematic diagram of the simulation result of the electric field of the arc-extinguishing chamber with a high voltage of 60kV applied to the XMZ-D moving end of the vacuum interrupter chamber design method based on the multi-dimensional analysis according to the first embodiment of the present invention;

3 is a schematic diagram of the simulation result of the electric field of the arc-extinguishing chamber with a BG-D static end and a high voltage of 60 kV according to the multi-dimensional analysis-based vacuum interrupter design method according to the first embodiment of the present invention;

4 is a schematic diagram of the simulation result of the electric field of the arc-extinguishing chamber with a high voltage of 60 kV applied to the moving end of the BG-D according to the multi-dimensional analysis-based vacuum interrupter design method according to the first embodiment of the present invention;

5 is a schematic diagram of the electric field simulation result of the XMZ-S static end plus the high voltage 60kV of the vacuum interrupter design method according to the first embodiment of the present invention;

6 is a schematic diagram of the simulation result of the electric field of the arc interrupter with a high voltage of 60kV applied to the XMZ-S moving end of the vacuum interrupter design method based on the multi-dimensional analysis according to the first embodiment of the present invention;

7 is a schematic diagram of the simulation result of the electric field of the arc-extinguishing chamber with a BG-S static end and a high voltage of 60 kV according to the multi-dimensional analysis-based vacuum interrupter design method according to the first embodiment of the present invention;

8 is a schematic diagram of the simulation result of the electric field of the arc-extinguishing chamber with a BG-S moving end and a high voltage of 60 kV according to the multi-dimensional analysis-based vacuum interrupter design method according to the first embodiment of the present invention;

FIG. 9 is a schematic position diagram of the vacuum interrupter X-ray radiation instrument of the vacuum interrupter design method based on the multi-dimensional analysis according to the first embodiment of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, not all of them. Example. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can do so without departing from the connotation of the present invention. Similar promotion, therefore, the present invention is not limited by the specific embodiments disclosed below.

Second, reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure, or characteristic that may be included in at least one implementation of the present invention. The appearances of "in one embodiment" in various places in this specification are not all referring to the same embodiment, nor are they separate or selectively mutually exclusive from other embodiments.

The present invention will be described in detail with reference to the schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the present invention. scope of protection. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in the actual production.

At the same time, in the description of the present invention, it should be noted that the orientation or positional relationship indicated in terms such as "upper, lower, inner and outer" is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention. The invention and simplified description do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first, second or third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

Unless otherwise expressly specified and limited in the present invention, the term "installation, connection, connection" should be understood in a broad sense, for example: it may be a fixed connection, a detachable connection or an integral connection; it may also be a mechanical connection, an electrical connection or a direct connection. The connection can also be indirectly connected through an intermediate medium, or it can be the internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Example 1

1 to 9, it is the first embodiment of the present invention, which provides a method for designing a vacuum interrupter based on multi-dimensional analysis, including:

S1: For Siemens single-section porcelain shell arc interrupter (XMZ-D), Siemens double-section porcelain shell arc-extinguishing chamber (XMZ-S), Baoguang single-section porcelain shell arc-extinguishing chamber (BG-D) and Baoguang The electric field of the double-section porcelain shell arc extinguishing chamber (BG-S) is calculated, and the electric field simulation of the arc extinguishing chamber is carried out respectively by applying voltage.

(1) The results of electric field calculation are shown in Table 1.

Table 1: Comparison of the calculation results of the electric field of the 4 types of arc chute.

It can be seen from the above table that 1) Although the strongest point of the electric field of the single-section ceramic shell arc extinguishing chamber is small, the electric field is not uniform, and the insulation ability of the actual product is poor;

2) The value of the strongest point of the electric field of the Baoguang double-section porcelain shell arc extinguishing chamber is smaller than that of the Siemens double-section porcelain shell arc extinguishing chamber.

Further, add 60kV high voltage to the static end and 60kV high voltage to the dynamic end respectively to simulate the electric field of the arc-extinguishing chamber. The simulation results are shown in Figures 1-8.

Table 2: Comparison of the strongest points of the electric field - the calculation results of the impact 60kV.

S2: Select the vacuum interrupter according to the electric field calculation results and simulation results, and carry out the final assembly design of the vacuum interrupter through the calculation parameters.

According to the electric field calculation results and simulation results, we can get:

(1) The electric field distribution of Baoguang double-section porcelain shell is uniform, which is suitable for use in transformer oil.

(2) In the arc-extinguishing chamber of a ceramic shell, the internal field strength is unevenly distributed, and the electric field at the closing of the shielding cylinder corresponding to the moving guide rod is concentrated. In case of wearing, Baoguang's practical experience, this kind of structure insulation level is suitable for low voltage occasions.

(3) In the arc extinguishing chamber with two ceramic shells, the electric field distribution is symmetrical and relatively uniform. Although the dynamic and static ceramic sealing field strength of two ceramic shells is stronger than that of one ceramic shell, the actual experience of this structure has a better insulation level, but it is suitable for use in in oil.

Therefore, in this embodiment, Baoguang Co., Ltd. selects the double-section porcelain shell arc-extinguishing chamber as the vacuum arc-extinguishing chamber. Further, the vacuum arc-extinguishing chamber is designed for final assembly. The final assembly design includes contact design, shielding system design, bellows design and ceramic shell design;

(1) Contact design

Table 3: Comparison of the strongest points of the electric field.

According to the working conditions of the arc extinguishing chamber in the on-load tap-changer of the commutator transformer, the requirements for the cut-off value are not high, so copper-chromium alloy is more suitable for the contact material.

(2) Shielding system design

The shielding system adopts Baoguang double-section porcelain shell voltage equalizing shielding system.

(3) Bellows design

Table 4: Performance comparison of 4 forms of bellows.

material grade Resistant to pitting corrosion Intergranular corrosion resistance carbide precipitation Welder performance High temperature resistance 304 generally generally generally generally generally 304L generally it is good few it is good it is good 316 it is good it is good few it is good it is good 316L excellent excellent few excellent excellent

Therefore, the material of the bellows is 316L; processing technology: hydroforming of thin-walled welded pipes.

(4) Porcelain shell design

该瓷壳较长，有利于高频次开断。Porcelain shell model selection

The porcelain shell is long, which is conducive to high-frequency breaking.

S3: Set the limit value, and carry out the X-ray test on the vacuum interrupter. If the test result does not meet the limit requirements, adjust the reading of the radiation instrument until the requirements are met.

(1) X-ray test

① Install the vacuum interrupter on the test positioning bracket, the contacts are separated at the specified minimum contact distance and the radiation instrument is in place, and the rated voltage Ur is applied to both ends of the contacts. After the shortest 15s, the radiation of the radiation instrument is read. Level;

② Raise the voltage at both ends of the contact to the rated power frequency withstand voltage Ud, and read the radiation level on the radiation instrument after the shortest 15s.

Among them, the sensing element of the radiation instrument is located in the separated contact plane and at the outer surface 1m closest to the vacuum interrupter, as shown in Figure 9.

(2) Set the limit

The X-rays emitted by the vacuum interrupter do not exceed the following limits:

①5μSv per hour at 1m at rated voltage Ur;

②150μSv per hour at 1m at rated power frequency withstand voltage Ud.

If the test results do not meet the limit requirements and the electrical safety requires that the radiation instrument is located at a distance of more than 1m, adjust the reading R (1m) of the radiation instrument according to the inverse square law, as follows:

R(1m)=R(d)·d ²

where R(d) is the radiation level measured at a distance d from the surface of the vacuum interrupter.

Example 2

In order to verify and illustrate the technical effect adopted in this method, in this embodiment, the designed vacuum interrupter is tested and tested to verify the real effect of this method.

(1) Measurement of contact self-closing force and contact reaction force

Test method: Fix the static end of the product vertically on the test bench, and use a dynamometer to measure the force when the contacts are just separated and the force when the contact distance rating is reached. During measurement, the moving end of the product is pulled down, and the measurement value is added to the gravity of the moving part; when the moving end of the product is pulled up, the measurement value minus the gravity of the moving part is the contact self-closing force and the contact reaction force.

(2) Internal gas pressure measurement and allowable storage period inspection

Internal gas pressure measurement: measured with a pulsed magnetron vacuum gauge.

Allowable storage period inspection: adopt the storage period pressurization detection method, that is, the vacuum arc extinguishing chamber after exhausting is put into a pressure container, and kept under a certain gas pressure for a specified time, and then a pulse magnetron vacuum gauge is used to measure the vacuum arc extinguishing The gas pressure inside the chamber.

The JB/T8738-2008 industry standard requires that the internal gas pressure should be lower than 1.33X10 ^-3 Pa during the factory inspection. The allowable storage period of the vacuum interrupter is 20 years. During the allowable storage period, the internal gas pressure of the vacuum interrupter should be low. At 6.6X10 ^{- 2} Pa; in order to ensure product reliability, the gas pressure of Baoguang vacuum interrupter is controlled to be lower than 5.0X10 ^-4 Pa, which is much higher than the industry standard requirements.

(3) Short-term power frequency withstand voltage test

According to GB/T16927.1-2011 Article 6 AC voltage test requirements.

Test voltage:

The test voltage should generally be an AC voltage with a frequency of 45Hz-55Hz, usually referred to as the power frequency test voltage.

以内，则认为高压试验结果不受波形畸变的影响。The waveform of the test voltage should be approximately sine wave, and the amplitude difference between the peak value of the positive half-wave and the peak value of the negative half-wave should be less than 2%. If the ratio of the peak value to the rms value of the sine wave is

within, it is considered that the high-voltage test results are not affected by waveform distortion.

Generation of test voltage:

①Test waveform: The test voltage is generally generated by a step-up test transformer, and can also be generated by a series resonance or parallel resonance circuit.

The voltage of the test circuit shall be sufficiently stable. Not affected by changes in leakage current. The non-destructive discharge on the test sample shall not reduce the test voltage so much and maintain it for such a long time that it significantly affects the measured value of the destructive discharge voltage on the test sample.

In the case of non-destructive discharges, unless otherwise specified by the relevant technical committee, provided it is shown that the value of the test voltage does not vary by more than 5% within several cycles after the discharge of the corresponding discharge, and that the instantaneous voltage drop during the non-destructive discharge does not exceed 20% of the peak voltage, it is considered that the withstand voltage test has passed. The characteristics of the test circuit must meet the above requirements, which are related to the test type (dry test, wet test), test voltage level and the performance of the test product.

The total capacitance of the test product and all external capacitors shall be sufficient to ensure that the measured destructive discharge voltage is not affected by the non-destructive partial discharge or pre-discharge of the test product. Usually, a total capacitance in the range of 0.5nF-1.0nF is sufficient.

②Measurement of test voltage: The measurement of test voltage value, root mean square (effective) value and transient voltage drop shall adopt a measurement system approved by the procedures specified in GB/T16927.2.

③ Measurement of test current: Usually, the traditional current transformer connected to the ground wire of the test product is used to measure the current of the test product, and it can also be taken from the high-voltage lead of the test product. A calibrated measurement system should be used for current measurements.

Test procedure: Execute in accordance with Article 6.3.1 of Article 6.3 in GB/T 16927.1-2011: Withstand Voltage Test.

Withstand voltage test:

The voltage applied to the test sample should be started from a value low enough to prevent the effects of overvoltage caused by operating transients; however, the voltage should be raised slowly to allow an accurate reading on the meter. However, it should not be generated too slowly, so as not to cause the withstand voltage time to be too long when it is close to the test voltage U. If the test voltage value rises at a rate of 2% U/s when it reaches 75% U, the above requirements can generally be met. The test voltage shall be maintained for a specified time, and then decreased rapidly, but shall not be cut off abruptly, so as to avoid possible transient processes that may cause failure or cause incorrect test results.

The test voltage application time is specified by the relevant technical committee and is independent of frequency within the frequency range of 45Hz-55Hz. If the relevant technical committee does not specify the application time of the test voltage, the duration of the withstand test is 60s.

If no destructive discharge occurs on the test object, the requirements for the withstand test are met.

(4) Lightning impulse withstand voltage test

According to GB/T16927.1-2011 Article 7 lightning impulse voltage test requirements.

Test voltage: standard lightning impulse voltage, that is, the wave front time T1 is 1.2μs, and the half-wave peak time T2 is a smooth lightning impulse full wave of 50μs, generally expressed as 1.2/50μs impulse;

Generation of test voltage: The test voltage is generally generated by an impulse voltage generator. The impulse voltage generator is mainly composed of many capacitors. The capacitors are first charged in parallel by the DC power supply, and then discharged in series to the circuit including the test product.

Test procedure: Execute in accordance with Article 7.3.1.2 of Article 7.3 in GB/T 16927.1-2011: Withstand Voltage Test Procedure B.

Apply the withstand voltage with the specified waveform and polarity to the test sample 15 times. If no more than 2 destructive discharges occur on the self-healing insulation, and the non-self-healing insulation is determined to be free from damage according to the testing method specified by the relevant technical committee, The test is considered to have passed, unless otherwise specified by the relevant technical committee, the test procedure shall be carried out as follows:

①The number of shocks is at least 15 times;

② There should be no destructive discharge on the non-self-recovery insulation; if it cannot be confirmed, it can be confirmed by applying 3 consecutive impulse withstands after the last destructive discharge;

③ The number of destructive discharges should not exceed 2 times (the number of times refers to the total number of destructive discharges from the first impact to the last impact, and only occurs on self-recovery insulation);

④ If a destructive discharge occurs in the 13th to 15th shocks, 3 consecutive shocks will be added after the discharge occurs (the total number of shocks is at most 18); if no damage occurs in the additional 3 shocks Sexual discharge, the sample is considered to pass the test.

(5) Environmental test

Test rules: After the test has passed the following 4 types of environmental tests, it is checked after standing for 2 hours under normal atmospheric conditions. There should be no mechanical damage or corrosion, the power frequency withstand voltage test should be qualified, and the product appearance should meet the product appearance requirements.

Table 5: Test items and severity of vacuum interrupter environmental test.

Combined with the test items (1) to (5), the obtained test results of the vacuum interrupter are shown in Table 6.

Table 6: Vacuum interrupter test results.

Test items Test standard Test results autism 80±40N qualified Reaction force 100±40N qualified Vacuum degree (internal gas pressure measurement and allowable storage period check) 5.0E10^-4Pa qualified Short-term (1min) power frequency withstand voltage 20kV qualified Lightning impulse withstand voltage 60kV qualified Environmental test Test according to standard qualified

It can be seen that the vacuum interrupter designed by this method meets the requirements.

It should be appreciated that embodiments of the present invention may be implemented or implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in non-transitory computer readable memory. The methods can be implemented in a computer program using standard programming techniques - including a non-transitory computer-readable storage medium configured with a computer program, wherein the storage medium so configured causes the computer to operate in a specific and predefined manner - according to the specific Methods and figures described in the Examples. Each program may be implemented in a high-level procedural or object-oriented programming language to communicate with a computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.

Furthermore, the operations of the processes described herein may be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes (or variations and/or combinations thereof) described herein can be performed under the control of one or more computer systems configured with executable instructions, and as code that executes collectively on one or more processors (eg, , executable instructions, one or more computer programs or one or more applications), implemented in hardware, or a combination thereof. The computer program includes a plurality of instructions executable by one or more processors.

Further, the methods may be implemented in any type of computing platform operably connected to a suitable, including but not limited to personal computer, minicomputer, mainframe, workstation, network or distributed computing environment, separate or integrated computers platform, or communicate with charged particle tools or other imaging devices, etc. Aspects of the invention may be implemented in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, an optically read and/or written storage medium, RAM, ROM, etc., such that it can be read by a programmable computer, when a storage medium or device is read by a computer, it can be used to configure and operate the computer to perform the processes described herein. Furthermore, the machine-readable code, or portions thereof, may be transmitted over wired or wireless networks. The invention described herein includes these and other various types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques described herein. A computer program can be applied to input data to perform the functions described herein, transforming the input data to generate output data for storage to non-volatile memory. The output information can also be applied to one or more output devices such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including specific visual depictions of physical and tangible objects produced on the display.

As used in this application, the terms "component," "module," "system," etc. are intended to refer to a computer-related entity, which may be hardware, firmware, a combination of hardware and software, software, or running software. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable, a thread in execution, a program, and/or a computer. As an example, both an application running on a computing device and the computing device may be components. One or more components can exist in a process and/or thread of execution, and a component can be localized on one computer and/or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures thereon. These components can be implemented by, for example, having one or more data groupings (eg, data from one component interacting with another component in a local system, a distributed system, and/or in a signaling manner such as the Internet network to interact with other systems) to communicate locally and/or as remote processes.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent substitutions without departing from the spirit and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims (9)

1. A vacuum arc-extinguishing chamber design method based on multi-dimensional analysis is characterized by comprising the following steps:

respectively carrying out electric field calculation on the Siemens single-section ceramic shell arc extinguish chamber, the Siemens double-section ceramic shell arc extinguish chamber, the Baoguang strand single-section ceramic shell arc extinguish chamber and the Baoguang strand double-section ceramic shell arc extinguish chamber, and respectively carrying out arc extinguish chamber electric field simulation by applying voltage;

selecting a vacuum arc extinguish chamber according to the electric field calculation result and the simulation result, and carrying out final assembly design on the vacuum arc extinguish chamber through calculation parameters;

and setting a limit value, carrying out an X-ray test on the vacuum arc-extinguishing chamber, and if the test result does not meet the requirement of the limit value, adjusting the reading of the radiation instrument until the requirement is met.

2. The method of claim 1, wherein the electric field calculation comprises:

the strongest electric field and position of each arc extinguish chamber when the static end is added with 20kV high voltage are respectively:

siemens single-section porcelain shell arc extinguish chamber: 8.8453e +6V/m, moving contact edge;

baoguang strand single section porcelain shell arc extinguish chamber: 7.7360e +6V/m, moving contact edge;

siemens double-section porcelain shell arc extinguish chamber: 1.6024e +7V/m, and carrying out static ceramic sealing;

baoguang strand double-section porcelain shell arc extinguish chamber: 1.0270e +7V/m, moving ceramic seal;

the strongest electric field and position of each arc extinguish chamber when the movable end is added with 20kV high voltage are respectively as follows:

siemens single-section porcelain shell arc extinguish chamber: 8.8460e +6V/m, moving contact edge;

baoguang strand single section porcelain shell arc extinguish chamber: 7.7370e +6V/m, moving contact edge;

siemens double-section porcelain shell arc extinguish chamber: 1.4648e +7V/m, moving ceramic seal;

baoguang strand double-section porcelain shell arc extinguish chamber: 7.7837e +6V/m, moving ceramic seal.

3. The method for designing a vacuum interrupter based on multi-dimensional analysis according to claim 2, comprising:

and respectively adding 60kV high voltage at the static end and 60kV high voltage at the dynamic end to simulate the electric field of the arc extinguish chamber to obtain the electric field distribution.

4. The method for designing a vacuum interrupter based on multi-dimensional analysis according to claim 2 or 3, wherein the assembly design includes a contact design, a shield system design, a bellows design, and a porcelain case design;

wherein, the material of contact is copper chromium alloy, and corrugated pipe material selects 316L.

5. The method for designing a vacuum interrupter based on multi-dimensional analysis according to claim 4, comprising:

the processing technology comprises the following steps: and (5) hydraulic forming of the thin-wall welded pipe.

6. The method for designing a vacuum interrupter based on multi-dimensional analysis according to claim 5, wherein the X-ray test comprises:

mounting the vacuum arc extinguish chamber on a test positioning bracket, separating a contact at a specified minimum contact spacing, positioning a radiation instrument, applying rated voltage Ur to two ends of the contact, and reading the radiation level of the radiation instrument after 15s is shortest;

and (4) raising the voltage at the two ends of the contact to the rated power frequency withstand voltage Ud, and reading the radiation level on the radiation instrument after the shortest time of 15 s.

7. The method for designing a vacuum interrupter based on multi-dimensional analysis according to claim 6, wherein the limit requirements include:

the X-ray emitted by the vacuum arc extinguish chamber does not exceed the following limit value:

5 μ Sv per hour at 1m below rated voltage Ur;

150 μ Sv per hour at 1m below the rated power frequency withstand voltage Ud.

8. The method for designing a vacuum interrupter based on multidimensional analysis according to claim 6 or 7, comprising:

the sensing element of the radiating instrument is located in the plane of the separated contacts and at the nearest outer surface 1m from the vacuum interrupter.

9. The method for designing a vacuum interrupter based on multi-dimensional analysis according to claim 8, comprising:

if the test result does not meet the limit requirement and the electrical safety requires that the radiation instrument is located at a distance exceeding 1m, the reading R (1m) of the radiation instrument is adjusted according to the inverse square law as follows:

R(1m)＝R(d)·d²

wherein, R (d) is the radiation level measured at the position d away from the surface of the vacuum arc extinguish chamber.

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