CN211718436U - High-temperature gas dielectric breakdown voltage detection device - Google Patents

Abstract

The utility model belongs to the field of electrical engineering, in particular to a high temperature gas medium breakdown voltage detection device. The AC voltage output terminal is connected with the gas breakdown voltage test bench, the gas breakdown voltage test bench output terminal is connected with the AC arc striking electrode input terminal; the DC voltage output terminal is connected with the gas breakdown voltage test bench input terminal, and the gas breakdown voltage The output end of the test bench is connected to the input end of the test electrode; the input end of the electronic pressure sensor is connected to the gas breakdown voltage test bench, the output end of the electronic pressure sensor is connected to the input end A of the multi-channel signal acquisition oscilloscope; the input end of the resistance-capacity voltage divider It is connected to the gas breakdown voltage test bench, and the output end of the resistance-capacitance voltage divider is connected to the input end B of the multi-channel signal acquisition oscilloscope; the gas temperature detection probe sensor is arranged between the AC arc striking electrode and the test electrode. The utility model can detect the dynamic breakdown voltage values of different gases under different flow rates, different pressures and different temperatures, and the detection accuracy is high.

Description

A high temperature gas dielectric breakdown voltage detection device

technical field

The utility model belongs to the field of electrical engineering, in particular to a device for detecting the breakdown voltage of a high-temperature gas medium, in particular to a device for detecting the dielectric insulation characteristics of a high-voltage gas circuit breaker after the arc.

Background technique

Gas insulation is widely used in power systems such as GIS, GIL and circuit breakers. As the temperature of insulating gas increases, the insulation performance will gradually decrease, especially after the circuit breaker is switched off and the arc is extinguished, the residual energy of the arc will be reduced. Keep the gas insulating medium between the fractures in a very high temperature range. If the recovery speed of the medium after the arc is lower than the recovery speed of the voltage between the contacts, it is very easy to produce a heavy breakdown after the arc. How to detect the insulating properties of high-temperature gas has become a key technical issue to ensure the insulation level of gas-insulated equipment after arc arc. Therefore, there is an urgent need for a device and method with strong operability and accurate detection to detect the breakdown voltage of a high temperature gas medium.

SUMMARY OF THE INVENTION

Aiming at the above-mentioned problems in the prior art, the utility model provides a high temperature gas dielectric breakdown voltage detection device and method, which is an insulating gas heating and voltage detection device based on an external power supply. The purpose is to solve the problems existing in the previous detection of the breakdown voltage measurement under the high temperature state of the expected insulating gas.

The technical scheme adopted by the utility model to solve its technical problems is:

A high-temperature gas medium breakdown voltage detection device, the AC voltage output ends are respectively connected with the input ends of the gas breakdown voltage test bench, and the output ends of the gas breakdown voltage test bench are respectively connected with the input ends of the AC arc striking electrodes; The voltage output terminals are respectively connected with the input terminals of the gas breakdown voltage test bench, and the output terminals of the gas breakdown voltage test bench are respectively connected with the input terminals of the test electrodes. Power supply; the input end of the electronic pressure sensor is connected to the gas breakdown voltage test bench, and the output end of the electronic pressure sensor is connected to the input end A of the multi-channel signal acquisition oscilloscope; the input end of the resistance-capacity voltage divider is connected to the gas breakdown voltage The voltage test bench is connected, and the output end of the resistance-capacitance voltage divider is connected to the input end B of the multi-channel signal acquisition oscilloscope; the gas temperature detection probe sensor is arranged between the AC arc striking electrode and the test electrode, and the output end of the gas temperature detection probe sensor Connect with the input end of the multi-channel signal acquisition oscilloscope; the gas outlet end of the gas recovery device is connected to the air inlet of the gas breakdown voltage test bench through the air channel, and the gas outlet end of the gas breakdown voltage test bench passes through the air channel and the return of the gas recovery device. The gas end is connected; the inlet end of the air velocity tester is connected to the outlet end of the gas recovery device through the air passage, and the outlet end of the air velocity tester is connected to the inlet end of the gas breakdown voltage test bench through the air passage.

The XT1_INPUTT1 and XT1_INPUTT2 of the AC voltage output terminal are respectively electrically connected to the input terminals of XT1_INPUTT1 and XT1_INPUTT2 of the gas breakdown voltage test bench, and the output terminals of XT1_INPUTT1 and XT1_INPUTT2 are respectively electrically connected to the input terminal of the AC arc striking electrode, and the output terminal of the AC voltage is electrically connected to the input terminal of the AC arc striking electrode. Supply power to the AC ignition electrode.

The XT2_INPUTT1 and XT2_INPUTT2 of the DC voltage output terminal are respectively electrically connected to the input terminals of XT2_INPUTT1 and XT2_INPUTT2 of the gas breakdown voltage test bench, and the output terminals of XT1_INPUTT1 and XT1_INPUTT2 are respectively electrically connected to the input terminal of the test electrode; composed of a C1 capacitor and a C2 capacitor The dynamic breakdown DC power supply powers the test electrodes.

The input end of the electronic pressure sensor is connected to the gas breakdown voltage test bench, the output end of the electronic pressure sensor is connected to the input end A of the multi-channel signal acquisition oscilloscope, and the gas pressure inside the gas breakdown voltage test bench is always detected.

The input end of the resistance-capacitance voltage divider is connected to the XT2_INPUTT1 of the gas breakdown voltage test bench, and the output end of the resistance-capacity voltage divider is connected to the input end B of the multi-channel signal acquisition oscilloscope, and the XT2_INPUTT1 of the gas breakdown voltage test bench is always detected. dynamic voltage changes.

The C1 capacitor is 100kV/0.5uF; the C2 capacitor is 100kV/0.001uF.

The R1 current-limiting resistance is 100Ω; the R3 current-limiting resistance is 100Ω; and the R2 frequency modulation resistance is 1MΩ.

The advantages and effects of the present utility model are:

1. The structure is simple and the design is reasonable, which can accurately detect the dynamic breakdown voltage value of different gases at different flow rates, different pressures and different temperatures.

2. The test system is stable and reliable, and the detection accuracy is high.

3. It has good gas heating efficiency, and the detected gas can be recovered.

4. The test result is an effective verification for the numerical calculation of gas breakdown voltage of high voltage and insulation technology.

5. Realize the measurement of breakdown voltage under multi-dimensional variables, and provide experimental support for the analysis of gas insulation performance and after-arc dielectric recovery characteristics.

6. The device can be widely produced as a product with considerable benefits.

Description of drawings

In order to facilitate those skilled in the art to understand and implement the present utility model, the present utility model is further described in detail below with reference to the accompanying drawings and specific embodiments, but it should be understood that the protection scope of the present utility model is not limited by the specific embodiments.

Fig. 1 is the partial structural representation of the electrical system of the present utility model;

Fig. 2 is the schematic diagram of the detection structure principle of the present utility model;

Fig. 3 is a dynamic breakdown voltage curve diagram actually measured by the utility model.

In the figure: power frequency step-up transformer 1; K1 protection circuit breaker 2; R1 current limiting resistor 3; C1 capacitor 4; C2 capacitor 5; K3 protection circuit breaker 6; R3 current limiting resistor 7; R2 frequency modulation resistor 8; K2 control switch 9; DC voltage output terminal 10; AC voltage output terminal 11; multi-channel signal acquisition oscilloscope 12; gas recovery device 13; gas breakdown voltage test bench 14; electronic pressure sensor 15; AC arc ignition electrode 18 ; test electrode 19 ; gas temperature detection probe sensor 20 ;

Detailed ways

The utility model is a high-temperature gas dielectric breakdown voltage detection device, as shown in FIG. It includes a power frequency step-up transformer 1, a C1 capacitor 4 and a C2 capacitor 5 with fast charging and discharging functions, a gas recovery device 13, a gas breakdown voltage test bench 14, an electronic pressure sensor 15, an air velocity tester 17, and a gas temperature Detection probe sensor 20 , multi-channel signal acquisition oscilloscope 12 and resistance-capacitance voltage divider 21 .

As shown in FIG. 2, FIG. 2 is a schematic diagram of the detection structure principle of the present invention. The specific connection mode of a high-temperature gas medium breakdown voltage detection device of the present invention during detection is as follows:

a. Connect the XT1_INPUTT1 and XT1_INPUTT2 of the AC voltage output terminal 11 in FIG. 1 to the input terminals of XT1_INPUTT1 and XT1_INPUTT2 of the gas breakdown voltage test bench 14 in FIG. The output ends are respectively electrically connected to the input ends of the AC arc striking electrodes 18 . The AC arc-striking electrode 18 is powered through the AC voltage output terminal. When the arc-striking electrodes are broken down to generate an arc, the arc energy heats the gas medium in the gas breakdown voltage test platform.

b. Electrically connect XT2_INPUTT1 and XT2_INPUTT2 of DC voltage output terminal 10 in FIG. 1 to the input terminals of XT2_INPUTT1 and XT2_INPUTT2 of gas breakdown voltage test bench 14 in FIG. The output terminals are respectively electrically connected to the input terminals of the test electrodes 19 . The test electrode is powered by the dynamic breakdown DC power supply composed of C1 capacitor 4 and C2 capacitor 5. When dynamic breakdown occurs when the high temperature and high speed gas medium flows between the test electrodes, the test breakdown voltage is detected.

c. In FIG. 2, the input end of the electronic pressure sensor 15 is connected to the gas breakdown voltage test bench 14, and the output end of the electronic pressure sensor 15 is connected to the input end A of the multi-channel signal acquisition oscilloscope 12 to detect the gas breakdown voltage at all times. Gas pressure inside the test stand 14 .

d. In Figure 2, the input end of the RC divider 21 is connected to XT2_INPUTT1 of the gas breakdown voltage test bench 14, and the output end of the RC divider 21 is connected to the input end B of the multi-channel signal acquisition oscilloscope 12 to detect gas at all times The dynamic voltage change of XT2_INPUTT1 of the breakdown voltage test bench 14 .

e. In FIG. 2, the gas temperature detection probe sensor 20 is arranged in the middle of the AC arc striking electrode 18 and the test electrode 19. The output end of the gas temperature detection probe sensor 20 is connected to the input end 3 of the multi-channel signal acquisition oscilloscope 12, and the detection is performed at all times. The temperature of the high temperature gas medium flowing out of the AC arc ignition electrode 18 .

f. In FIG. 2, the gas outlet end of the gas recovery device 13 is connected to the air inlet of the gas breakdown voltage test bench 14 through the gas channel 16, and the gas outlet end of the gas breakdown voltage test bench 14 passes through the air channel and returns to the gas recovery device 13. The gas end is connected, the inlet end of the air velocity tester 17 is connected to the outlet end of the gas recovery device 13 through the air passage, and the outlet end of the air velocity tester 17 is connected to the inlet end of the gas breakdown voltage test bench 14 through the air passage. The velocity of the gas flow into the gas breakdown voltage test stand 14 was detected.

g. C1 capacitor 4 is 100kV/0.5uF; C2 capacitor 5 is 100kV/0.001uF; R1 current limiting resistor 3 is 100Ω; R3 current limiting resistor 7 is 100Ω; R2 frequency modulation resistor 8 is 1MΩ.

The operation process of using the high-temperature gas medium breakdown voltage detection device of the present utility model for detection includes the following steps:

Step 1. First, make sure that the K1 protection circuit breaker 2, the K2 control switch 9 and the K3 protection circuit breaker 6 are in the disconnected state.

Step 2. Adjust the distance between the AC arc striking electrode 18 and the test electrode 19. The value of the electrode distance is determined according to the gas pressure and properties.

Step 3. Inflate the gas breakdown voltage test bench 14 through the gas recovery device 13, and adjust the gas pressure to a preset value.

Step 4. Close the K1 protection circuit breaker 2, the power frequency step-up transformer 1 boosts the voltage to the rated voltage of the C1 capacitor 4 and the C2 capacitor 5, then open the K1 protection circuit breaker 2, and the power frequency step-up transformer 1 voltage returns to zero.

Step 5. Close the K3 protection circuit breaker 6, adjust the speed of the airflow through the AC arc ignition electrode 18 and the test electrode 19 through the gas recovery device 13, and use the airflow velocity tester 17 to record the initial airflow velocity value.

Step 6. Turn on the airflow velocity tester 17, and record the voltage across the test electrode 19 and the gas pressure and temperature values in the test bench 14 at all times.

Step 7. The power frequency step-up transformer 1 boosts the voltage between the AC arc-striking electrodes 18 for arcing, and maintains the arc combustion. The gas temperature detection probe sensor 20 detects the temperature of the airflow flowing out of the AC arc-striking electrodes 18 .

Step 8. When the high-speed and high-temperature airflow passes through the test electrode 19, under the action of the voltage across the C2 capacitor 5, the test electrode 19 breaks down, and the C2 capacitor 5 discharges. Record the first breakdown voltage value.

Step 9. After the discharge of the C2 capacitor 5 is completed, the C1 capacitor 4 rapidly charges the C2 capacitor 5 through the R2 frequency modulation resistor 8. When the voltage of the C2 capacitor 5 rises to the dielectric breakdown voltage between the test electrodes 19, the test electrode 19 is struck again. Break through, record the second breakdown voltage value. Repeatedly in sequence, the medium between the test electrodes 19 appeared dynamic breakdown process, the test lasted for 1s, ended the test, recorded multiple breakdown voltage values, and took the arithmetic mean root value as the final breakdown voltage value.

Step 10. Arrange the test data, and according to the multi-channel signal acquisition oscilloscope 12 and the airflow velocity tester 17 recorded airflow temperature, gas pressure, airflow velocity, breakdown voltage value, give the gas breakdown voltage value in the multi-dimensional state, as shown in the table 1 shown.

Step 11. Adjust the electrode spacing values of the test electrodes 19 in sequence, repeat the test steps 1-10 after each adjustment, and record the high-speed high-temperature gas breakdown voltage values under different test electrode spacings.

Step 12. Adjust the gas pressure in sequence, repeat the test steps 1-10 after each adjustment, and record the breakdown voltage values of the high-speed and high-temperature gas under different gas pressures.

Step 13. Sequentially adjust the gas flow rate flowing through the test electrode 19, repeat the test steps 1-10 after each adjustment, and record the breakdown voltage values of high-speed and high-temperature gas under different gas flow rates.

Step 14. Adjust the arc current of the AC arc striking electrode 18 in turn, adjust the temperature of the air flow between the electrodes of the test electrode 19 by adjusting the arc energy, repeat the test steps 1-10 after each adjustment, and record the high speed and high temperature under different airflow temperatures Gas breakdown voltage value.

Step 15. By changing the test variables several times above, the gas breakdown characteristic curve in the multi-dimensional state is given.

As shown in FIG. 3 , FIG. 3 is a graph of the dynamic breakdown voltage actually measured by the utility model.

Table 1 Summary of test results

gas properties Pole spacing pressure temperature Air velocity breakdown voltage SF6 10mm 0.1MPa 5000K 2m/s 3.6kV

Claims (8)

1. a high temperature gas medium breakdown voltage detection device, it is characterized in that: the alternating voltage output end is connected with the input end of the gas breakdown voltage test stand respectively, and the output end of the gas breakdown voltage test stand is respectively connected with the The input end is connected; the DC voltage output end is respectively connected with the input end of the gas breakdown voltage test bench, and the output end of the gas breakdown voltage test bench is respectively connected with the input end of the test electrode; the dynamic breakdown through the C1 capacitor and the C2 capacitor The DC power supply supplies power to the test electrodes; the input end of the electronic pressure sensor is connected to the gas breakdown voltage test bench, and the output end of the electronic pressure sensor is connected to the input end A of the multi-channel signal acquisition oscilloscope; the input end of the resistance-capacitance voltage divider is connected The terminal is connected to the gas breakdown voltage test bench, and the output terminal of the resistance-capacitance voltage divider is connected to the input terminal B of the multi-channel signal acquisition oscilloscope; the gas temperature detection probe sensor is arranged between the AC arc striking electrode and the test electrode, and the gas temperature detection probe The output end of the needle sensor is connected to the input end of the multi-channel signal acquisition oscilloscope; the gas outlet end of the gas recovery device is connected to the air inlet of the gas breakdown voltage test bench through the air channel, and the gas outlet end of the gas breakdown voltage test bench is connected to the gas breakdown voltage test bench through the air channel. The return end of the gas recovery device is connected; the inlet end of the air velocity tester is connected to the outlet end of the gas recovery device through the air passage, and the outlet end of the air velocity tester is connected to the inlet end of the gas breakdown voltage test bench through the air passage connect. 2. A high-temperature gas dielectric breakdown voltage detection device according to claim 1, wherein the XT1_INPUTT1 and XT1_INPUTT2 of the AC voltage output terminal are respectively electrically connected to the input terminals of the XT1_INPUTT1 and XT1_INPUTT2 of the gas breakdown voltage test bench , the output terminals of XT1_INPUTT1 and XT1_INPUTT2 are respectively electrically connected with the input terminal of the AC arc striking electrode, and the AC arc striking electrode is powered by the AC voltage output terminal. 3. A high-temperature gas dielectric breakdown voltage detection device according to claim 1, wherein the XT2_INPUTT1 and XT2_INPUTT2 of the DC voltage output terminal are respectively electrically connected to the input terminals of the XT2_INPUTT1 and XT2_INPUTT2 of the gas breakdown voltage test bench , the output terminals of XT1_INPUTT1 and XT1_INPUTT2 are respectively electrically connected with the input terminal of the test electrode; the test electrode is powered by the dynamic breakdown DC power supply composed of the C1 capacitor and the C2 capacitor. 4. A high-temperature gas medium breakdown voltage detection device according to claim 1, wherein the input end of the electronic pressure sensor is connected to the gas breakdown voltage test bench, and the output end of the electronic pressure sensor is connected to the gas breakdown voltage test bench. The input terminal A of the multi-channel signal acquisition oscilloscope is connected to detect the gas pressure inside the gas breakdown voltage test bench at all times. 5. a kind of high temperature gas dielectric breakdown voltage detection device according to claim 1 is characterized in that: the input end of described resistance-capacitance voltage divider is connected with XT2_INPUTT1 of gas breakdown voltage test bench, and the resistance-capacitance voltage divider The output end of the oscilloscope is connected to the input end B of the multi-channel signal acquisition oscilloscope, and the dynamic voltage change of XT2_INPUTT1 of the gas breakdown voltage test bench is always detected. 6 . The high-temperature gas medium breakdown voltage detection device according to claim 1 , wherein the gas temperature detection probe sensor constantly detects the temperature of the high-temperature gas medium flowing out of the AC arc ignition electrode. 7 . 7 . The device for detecting the breakdown voltage of a high temperature gas medium according to claim 1 , wherein the airflow velocity tester detects the velocity of the airflow flowing into the gas breakdown voltage test bench ( 14 ) at all times. 8 . 8 . The high-temperature gas dielectric breakdown voltage detection device according to claim 1 , wherein the C1 capacitor is 100kV/0.5uF; the C2 capacitor is 100kV/0.001uF. 9 .

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