Circuit breaker insulation state inspection test system and method based on circuit breaker synthesis voltage source loop

Abstract

The invention discloses a circuit breaker insulation state inspection test system and method based on a circuit breaker synthetic voltage source loop, and the method comprises the steps: setting a frequency modulation capacitor in the circuit breaker synthetic voltage source loop to be 0 through quitting a power frequency reactor and a discharge resistor in the circuit breaker synthetic voltage source loop, thereby enabling the circuit to deform into a loop 1; or the circuit is deformed into a loop 2 by exiting a power frequency reactance in a circuit breaker synthesis voltage source loop, or the circuit is deformed into a loop 3 by exiting a discharge resistor in the circuit breaker synthesis voltage source loop, so that the circuit breaker insulation state inspection test system capable of being deformed into three test loops is obtained. Based on the loop, a relation equivalent model of fracture voltage per unit values and time of the tested high-voltage alternating-current circuit breaker is established, parameters of the loop are obtained through a method for solving the equivalent model, and based on the obtained loop parameters, the loop generates voltage waveforms used for the insulation state inspection test of the circuit breaker.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high voltage test, and particularly relates to a circuit breaker insulation state inspection test system and method based on a circuit breaker synthetic voltage source loop. BACKGROUND

[0002] After a high-voltage alternating current circuit breaker performs capacity tests such as short-circuit breaking and opening and closing tests, an insulation state inspection test needs to be performed, that is, an impulse voltage satisfying certain conditions is applied to the high-voltage alternating current circuit breaker to determine whether it passes the insulation state inspection test. Generally, the impulse voltage is generated by an impulse voltage generator based on the Max generator principle. The high-voltage level impulse generator has a large volume and occupies a large area, and the insulation state inspection test of the high-voltage alternating current circuit breaker is preferably performed at a test station. Therefore, if a traditional structure impulse voltage generator is used to perform the insulation state inspection test of the 72.5kV and above level high-voltage alternating current circuit breaker, not only is it difficult to arrange the test station, but also the investment is large.

[0003] The existing solution is to use a circuit breaker synthetic voltage source loop to provide a direct current recovery voltage for a test product, but this solution is too severe for the test product. Alternatively, a temporary test loop is built when the insulation state inspection test is performed, but this solution has the disadvantages of large workload and additional investment. SUMMARY

[0004] The application aims to solve the problems of difficult arrangement of a test station, large investment and large workload in the existing insulation state inspection test method, and provides a circuit breaker insulation state inspection test system and method based on a circuit breaker synthetic voltage source loop.

[0005] The application provides a circuit breaker insulation state inspection test system, which comprises:

[0006] A test loop switching module is configured to switch corresponding electronic components on the basis of the built circuit breaker synthetic voltage source loop to obtain a circuit breaker insulation state inspection test loop under different conditions.

[0007] A test loop parameter calculation module is configured to establish an equivalent model of the relationship between the fault voltage per unit of a high-voltage alternating current circuit breaker to be tested and time, and to obtain parameters of the circuit breaker insulation state inspection test loop by solving the equivalent model based on the circuit breaker insulation state inspection test loop, the parameters of the circuit breaker insulation state inspection test loop being parameter values of electronic components for constructing the circuit breaker insulation state inspection test loop.

[0008] A voltage waveform generation module is configured to generate a voltage waveform for the circuit breaker insulation state inspection test based on the obtained parameters of the circuit breaker insulation state inspection test loop.

[0009] The application provides a circuit breaker insulation state inspection test method, comprising:

[0010] On the basis of the built circuit breaker synthetic voltage source loop, different circuit breaker insulation state inspection test loops under different conditions are obtained by switching corresponding electronic components; an equivalent model of the relationship between the voltage threshold value of the tested high-voltage alternating current circuit breaker and time is established;

[0011] Based on the circuit breaker insulation state inspection test loop, the parameters of the circuit breaker insulation state inspection test loop are obtained by solving the equivalent model, and the parameters of the circuit breaker insulation state inspection test loop are the parameter values of the electronic components for constructing the circuit breaker insulation state inspection test loop;

[0012] Based on the obtained parameters of the circuit breaker insulation state inspection test loop, the circuit breaker insulation state inspection test loop generates a voltage waveform for circuit breaker insulation state inspection.

[0013] Advantages: compared with the prior art, the application has the following advantages:

[0014] (1) The circuit breaker insulation state inspection test system provided by the application, based on a typical circuit breaker synthetic voltage source loop, provides three kinds of insulation state inspection test loops by loop switching and automatic component parameter configuration method without increasing investment, flexibly realizes the voltage waveform of the insulation state inspection test completely meeting the standard requirements, and has the advantages of high redundancy, high test efficiency, etc.

[0015] (2) The method provided by the application supports quantitative solution of loop parameters and quantitative operation of parameters by deducing the equivalent analytical expression u(t) of the impulse voltage, is conducive to realizing automatic control of the test, and has the advantages of convenience, speed, precision and being suitable for automatic programming;

[0016] (3) The method provided by the application can calculate the minimum capacitance value and minimum charging voltage value of the main capacitor corresponding to the voltage waveform of the insulation state inspection test completely meeting the standard requirements, thereby greatly reducing the test risk;

[0017] (4) The first test loop provided by the application is composed of only four circuit elements, is simpler than other loops, has low equipment cost, and has market promotion value. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The voltage waveform schematic diagram for completely meeting the insulation state inspection test requirements;

[0019] Figure 2 The circuit diagram of the typical circuit breaker synthetic voltage source loop;

[0020] Figure 3 This is a circuit diagram of the first test loop proposed in Example 1;

[0021] Figure 4 This is a circuit diagram of the second test loop proposed in Example 2;

[0022] Figure 5 This is a circuit diagram of the third test loop proposed in Example 3;

[0023] Figure 6 Schematic diagram of the voltage waveform generated by the first test circuit. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions and advantages of the present invention more clear, the following will further illustrate a circuit breaker insulation condition inspection test system and method based on a circuit breaker synthetic voltage source circuit proposed in the present invention in conjunction with the drawings and embodiments of the present invention.

[0025] Example 1:

[0026] The circuit breaker synthetic voltage source circuit is transformed to obtain the first test circuit, and the parameters of the first test circuit are set to provide the test product TO with Figure 1 Specific surge voltage for the indicated function.

[0027] Specific operations include:

[0028] Figure 2 The circuit diagram of a typical circuit breaker synthetic voltage source loop is shown, which includes: a main capacitor, an ignition bulb, a power frequency reactor, a main reactor, a frequency modulation resistor, a frequency modulation capacitor, a discharge resistor, a time-delay capacitor, and a test sample. The time-delay capacitor is connected in parallel at both ends of the test sample, one end of the test sample is grounded, and its other end is connected to one end of the main reactor, the other end of the main reactor is connected to one end of the ignition bulb, the other end of the ignition bulb is connected to one end of the main capacitor, the other end of the main capacitor is grounded, one end of the power frequency reactor is connected to the other end of the main reactor, the other end of the power frequency reactor is grounded, one end of the frequency modulation resistor is connected to one end of the main reactor, the other end of the frequency modulation resistor is connected to one end of the frequency modulation capacitor, the other end of the frequency modulation capacitor is grounded, one end of the discharge resistor is connected to the other end of the frequency modulation resistor, and the other end of the discharge resistor is grounded.

[0029] exist Figure 2 Based on the circuit breaker synthetic voltage source circuit, by exiting the power frequency reactance L pf and the discharge resistor R D , set the FM capacitor C1 to 0, then, Figure 2 The circuit breaker synthetic voltage source loop is transformed into Figure 3 The first test circuit shown in FIG. 1 is composed of a time delay capacitor C d , frequency modulation resistor R1, main reactance Lh And the main capacitor Ch.

[0030] Establish an equivalent model of the relationship between the per-unit value of the break voltage and time of the tested high-voltage AC circuit breaker:

[0031]

[0032] Where u(t) represents the fracture voltage, i.e., the voltage waveform of the condition inspection test, t represents time, ω0 represents the undamped oscillation angular frequency, ω represents the damped oscillation angular frequency, δ and β are symbols used to simplify the expression, R1 represents the parameter value of the frequency modulation resistor, C d Indicates the parameter value of the delay capacitor, L h Indicates the parameter value of the main reactance. and Under the conditions, K af Represents the amplitude coefficient:

[0033] Depend on Can be obtained

[0034] make

[0035] Depend on K can be obtained af .

[0036] Depend on We can obtain ω·t t .

[0037] Depend on δ can be obtained.

[0038] ω can be obtained from ω=mδ.

[0039] Depend on t2 can be obtained.

[0040] After ω and δ are determined, the parameters of the first test loop can be obtained. The specific operations include:

[0041] Select L according to equipment parameters h The value of and Can determine C d , R1 and C h Parameters.

[0042] According to the determination of C d , R1 and C h The parameters of the first test circuit can meet the waveform characteristics of the specific impulse voltage requirements, such as Figure 6 As shown, the t1 value is 220μs.

[0043] Example 2:

[0044] The circuit breaker synthetic voltage source circuit is transformed to obtain a second test circuit, and parameters of the second test circuit are set to provide the test object TO with a specific impulse voltage having the functions shown in FIG. 2. Figure 1

[0045] The specific operations include:

[0046] By exiting the power frequency reactance L pf , the circuit breaker synthetic voltage source circuit of FIG. 1 is transformed to the second test circuit shown in FIG. 2, which is composed of a time delay capacitor C d , a frequency modulation resistor R1, a frequency modulation capacitor C1, a discharge resistor R D , a main reactance L h , and a main capacitor Ch. Figure 2 Figure 4 The equivalent model of the relationship between the breaking voltage of the high-voltage alternating current circuit breaker being tested and time is established, and the parameter values of L h , C d , R1, and C h are calculated according to the following formula.

[0047] The equivalent model of the relationship between the breaking voltage of the high-voltage alternating current circuit breaker being tested and time is established, and the parameter values of L h , C d , R1, and C h are calculated according to the following formula.

[0048]

[0049] ω = mδ

[0050]

[0051] The parameter values of C1 and R D are calculated according to C1 = 20C d and 4R d C1 < 3s.

[0052] The voltage waveform generated by the second test circuit can meet the requirements of the waveform characteristics of the specific impulse voltage according to the calculated parameter values of L h , C d , R1, C h , C1, and R D .

[0053] Example 3

[0054] The circuit breaker synthetic voltage source circuit is transformed to obtain a third test circuit, and parameters of the third test circuit are set to provide the test object TO with a specific impulse voltage having the functions shown in FIG. 3. Figure 1

[0055] The specific operations include:

[0056] Figure 2The circuit diagram of a typical circuit of a breaker synthetic voltage source is shown, which comprises a main capacitor, a spark ball, a power frequency reactance, a main reactance, a frequency modulation resistor, a frequency modulation capacitor, a discharge resistor, a time delay capacitor and a test sample. The time delay capacitor is connected in parallel across the test sample, one end of the test sample is connected to ground, the other end of the test sample is connected to one end of the main reactance, the other end of the main reactance is connected to one end of the spark ball, the other end of the spark ball is connected to one end of the main capacitor, the other end of the main capacitor is connected to ground, one end of the power frequency reactance is connected to the other end of the main reactance, the other end of the power frequency reactance is connected to ground, one end of the frequency modulation resistor is connected to one end of the main reactance, the other end of the frequency modulation resistor is connected to one end of the frequency modulation capacitor, the other end of the frequency modulation capacitor is connected to ground, one end of the discharge resistor is connected to the other end of the frequency modulation resistor, the other end of the discharge resistor is connected to ground. By removing the discharge resistor R D , the breaker synthetic voltage source circuit of Figure 2 is converted into a third circuit 3 as shown in Figure 5 , which is composed of a time delay capacitor C d , a frequency modulation resistor R1, a frequency modulation capacitor C1, a main reactance L h , a main capacitor Ch and a power frequency reactance L pf .

[0057] The equivalent model of the relationship between the breaking voltage per unit of the high voltage AC circuit breaker being tested and time is established, which is the same as in Example 1, and then the parameter values of L h , C d , R1, C h , C1 are calculated according to the following formula.

[0058]

[0059] ω = mδ

[0060]

[0061] C1 = 20C d

[0062] The parameter value of L pf is calculated according to .

[0063] According to the calculated parameter values of L h , C d , R1, C h , C1 and L pf , the voltage waveform generated by the third test circuit can meet the requirements of the waveform characteristics of the specific impulse voltage.

[0064] Any combination of the technical features in the above embodiments can be made, and for the sake of brevity, not all possible combinations are described above, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered within the scope of the present disclosure.

[0065] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the present application. It shall be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A circuit breaker insulation condition inspection test system, characterized by: include: The test circuit switching module is used to obtain the circuit breaker insulation status inspection test circuit under different conditions by switching the corresponding electronic components on the basis of the constructed circuit breaker synthetic voltage source circuit; A test circuit parameter calculation module is used to establish an equivalent model of the relationship between the per-unit value of the break voltage and time of the tested high-voltage AC circuit breaker; based on the circuit breaker insulation state check test circuit, the equivalent model is solved to obtain parameters of the circuit breaker insulation state check test circuit, wherein the parameters of the circuit breaker insulation state check test circuit are parameter values ​​of electronic components used to construct the circuit breaker insulation state check test circuit; The voltage waveform generating module is used for generating a voltage waveform for a circuit breaker insulation state check test based on the obtained parameters of the circuit breaker insulation state check test circuit. The circuit breaker insulation state check test circuit generates a voltage waveform for a circuit breaker insulation state check test.

2. A circuit breaker insulation status inspection test system according to claim 1, characterized in that: The circuit breaker synthetic voltage source circuit includes: main capacitor, ignition ball, power frequency reactance, main reactance, frequency modulation resistor, frequency modulation capacitor, discharge resistor, time delay capacitor and test piece; The time delay capacitor is connected in parallel at both ends of the test piece, one end of the test piece is grounded, and the other end thereof is connected to one end of the main reactance, the other end of the main reactance is connected to one end of the ignition ball, the other end of the ignition ball is connected to one end of the main capacitor, the other end of the main capacitor is grounded, one end of the power frequency reactance is connected to the other end of the main reactance, the other end of the power frequency reactance is grounded, one end of the frequency modulation resistor is connected to one end of the main reactance, the other end of the frequency modulation resistor is connected to one end of the frequency modulation capacitor, the other end of the frequency modulation capacitor is grounded, one end of the discharge resistor is connected to the other end of the frequency modulation resistor, and the other end of the discharge resistor is grounded.

3. A circuit breaker insulation status inspection test system according to claim 2, characterized in that: Based on the constructed circuit breaker synthetic voltage source circuit, by switching corresponding electronic components, a circuit breaker insulation status inspection test circuit under different conditions is obtained, which specifically includes: Remove the power frequency reactance and discharge resistance in the circuit breaker synthetic voltage source circuit, set the frequency modulation capacitor in the circuit breaker synthetic voltage source circuit to 0, and obtain the circuit breaker insulation status inspection test circuit; Alternatively, the power frequency reactance in the circuit breaker synthetic voltage source circuit can be removed to obtain the circuit breaker insulation status inspection test circuit; Alternatively, the discharge resistor in the circuit breaker synthetic voltage source circuit is removed to obtain the circuit breaker insulation status inspection test circuit.

4. A circuit breaker insulation status inspection test system according to claim 3, characterized in that: The power frequency reactance and discharge resistance in the circuit breaker synthetic voltage source circuit are removed, and the frequency modulation capacitor in the circuit breaker synthetic voltage source circuit is set to 0, thereby obtaining a circuit breaker insulation status inspection test circuit, which includes: a main capacitor, an ignition ball, a main reactance, a frequency modulation resistor, a time delay capacitor, and a test piece; The time delay capacitor is connected in parallel at both ends of the test piece, one end of the test piece is grounded, and the other end is connected to one end of the main reactance, the other end of the main reactance is connected to one end of the ignition ball, the other end of the ignition ball is connected to one end of the main capacitor, the other end of the main capacitor is grounded, one end of the frequency modulation resistor is connected to one end of the main reactance, and the other end of the frequency modulation resistor is grounded.

5. A circuit breaker insulation status inspection test system according to claim 3, characterized in that: The power frequency reactance in the circuit breaker synthetic voltage source circuit is withdrawn to obtain a circuit breaker insulation state inspection test circuit, which includes: a main capacitor, an ignition ball, a main reactance, a frequency modulation resistor, a frequency modulation capacitor, a discharge resistor, a time delay capacitor and a test piece; The time delay capacitor is connected in parallel at both ends of the test piece, one end of the test piece is grounded, and the other end is connected to one end of the main reactance, the other end of the main reactance is connected to one end of the ignition ball, the other end of the ignition ball is connected to one end of the main capacitor, the other end of the main capacitor is grounded, one end of the frequency modulation resistor is connected to one end of the main reactance, the other end of the frequency modulation resistor is connected to one end of the frequency modulation capacitor, the other end of the frequency modulation capacitor is grounded, one end of the discharge resistor is connected to the other end of the frequency modulation resistor, and the other end of the discharge resistor is grounded.

6. A circuit breaker insulation status inspection test system according to claim 3, characterized in that: The discharge resistor in the circuit breaker synthetic voltage source circuit is exited to obtain a circuit breaker insulation state inspection test circuit, which includes: main capacitor, ignition ball, power frequency reactance, main reactance, frequency modulation resistor, frequency modulation capacitor, time delay capacitor and test piece; The time delay capacitor is connected in parallel at both ends of the test piece, one end of the test piece is grounded, and the other end is connected to one end of the main reactance, the other end of the main reactance is connected to one end of the ignition ball, the other end of the ignition ball is connected to one end of the main capacitor, the other end of the main capacitor is grounded, one end of the power frequency reactance is connected to the other end of the main reactance, the other end of the power frequency reactance is grounded, one end of the frequency modulation resistor is connected to one end of the main reactance, the other end of the frequency modulation resistor is connected to one end of the frequency modulation capacitor, and the other end of the frequency modulation capacitor is grounded.

7. A circuit breaker insulation status inspection test system according to claim 3, characterized in that: The equivalent model for establishing the relationship between the per-unit value of the break voltage and time of the tested high-voltage AC circuit breaker is expressed as: Where u(t) represents the voltage waveform used for the circuit breaker insulation condition inspection test, t represents time, ω0 represents the undamped oscillation angular frequency, ω represents the damped oscillation angular frequency, δ and β are symbols used to simplify the expression, R1 represents the parameter value of the frequency modulation resistor, C d Indicates the parameter value of the delay capacitor, L h Indicates the parameter value of the main reactance.

8. A circuit breaker insulation status inspection test system according to claim 7, characterized in that: By removing the power frequency reactance and discharge resistance in the circuit breaker synthetic voltage source circuit and setting the frequency modulation capacitor in the circuit breaker synthetic voltage source circuit to 0, the circuit breaker insulation state check test circuit is obtained. Based on the circuit breaker insulation state check test circuit, the parameters of the circuit breaker insulation state check test circuit are obtained by solving the equivalent model, including: In satisfaction and Under the condition of t=3ms, K af represents the amplitude coefficient, C h Indicates the parameter value of the main capacitor: According to the following formula make K is obtained according to the following formula af : According to the following formula, we can obtain ω·t t : According to the following formula, δ is obtained: Where, t t The time coordinate corresponding to the tangent point between the straight line passing through the origin and the voltage waveform, t c The time coordinate of the intersection of the straight line passing through the origin and tangent to the voltage waveform and the straight line passing over the voltage peak and horizontal to the time coordinate axis; ω is obtained by ω = mδ; Calculate t2 according to the following formula, where t2 represents the time coordinate corresponding to the maximum value of the voltage waveform: After ω and δ are determined, the parameter value of the main reactance L is selected according to the circuit breaker being tested. h ,Depend on and Determine the parameter value of the delay capacitor C d , the parameter value of the frequency modulation resistor R1 and the parameter value of the main capacitor C h , thus obtaining the parameters of the circuit breaker insulation status inspection test circuit: L h 、C d , R1 and C h .

9. A circuit breaker insulation condition inspection test system according to claim 7, characterized in that: By removing the power frequency reactance from the circuit breaker synthetic voltage source circuit, a circuit breaker insulation state check test circuit is obtained. Based on the circuit breaker insulation state check test circuit, the parameters of the circuit breaker insulation state check test circuit are obtained by solving the equivalent model, including: In satisfaction and Under the condition of t=3ms, K af represents the amplitude coefficient, C h Indicates the parameter value of the main capacitor: According to the following formula make K is obtained according to the following formula af : According to the following formula, we can obtain ω·t t : According to the following formula, δ is obtained: Where, t t The time coordinate corresponding to the tangent point between the straight line passing through the origin and the voltage waveform, t c The time coordinate of the intersection of the straight line passing through the origin and tangent to the voltage waveform and the straight line passing over the voltage peak and horizontal to the time coordinate axis; ω is obtained by ω = mδ; Calculate t2 according to the following formula, where t2 represents the time coordinate corresponding to the maximum value of the voltage waveform: After ω and δ are determined, the parameter value of the main reactance L is selected according to the circuit breaker being tested. h ,Depend on and Determine the parameter value of the delay capacitor C d , the parameter value of the frequency modulation resistor R1 and the parameter value of the main capacitor C h ; According to C1 = 20C d and 4R d C1<3s, calculate the parameter value of the FM capacitor C1 and the parameter value of the discharge resistor R D , thus obtaining the parameters of the circuit breaker insulation status inspection test circuit: L h 、C d , R1, C h , C1 and R D .

10. The circuit breaker insulation status inspection test system according to claim 7, characterized in that: By removing the discharge resistor from the circuit breaker synthetic voltage source circuit, a circuit breaker insulation state check test circuit is obtained. Based on the circuit breaker insulation state check test circuit, the parameters of the circuit breaker insulation state check test circuit are obtained by solving the equivalent model, specifically including: In satisfaction and Under the condition of t=3ms, K af represents the amplitude coefficient, C h Indicates the parameter value of the main capacitor: According to the following formula make K is obtained according to the following formula af : According to the following formula, we can obtain ω·t t : According to the following formula, δ is obtained: Where, t t The time coordinate corresponding to the tangent point between the straight line passing through the origin and the voltage waveform, t c The time coordinate of the intersection of the straight line passing through the origin and tangent to the voltage waveform and the straight line passing over the voltage peak and horizontal to the time coordinate axis; ω is obtained by ω = mδ; Calculate t2 according to the following formula, where t2 represents the time coordinate corresponding to the maximum value of the voltage waveform: After ω and δ are determined, the parameter value of the main reactance L is selected according to the circuit breaker being tested. h ,Depend on and Determine the parameter value of the delay capacitor C d , the parameter value of the frequency modulation resistor R1 and the parameter value of the main capacitor C h ; According to C1=20C d , calculate the parameter value C1 of the frequency modulation capacitor; The parameter value L of the power frequency reactance is calculated according to the following formula: pf : Thus, the parameters of the circuit breaker insulation status inspection test circuit are obtained: L h 、C d , R1, C h , C1 and L pf .

11. A circuit breaker insulation condition inspection test method, characterized in that: include: Based on the constructed circuit breaker synthetic voltage source circuit, by switching the corresponding electronic components, the circuit breaker insulation status inspection test circuit under different conditions is obtained; an equivalent model of the relationship between the per-unit value of the break voltage and time of the tested high-voltage AC circuit breaker is established; Based on the circuit breaker insulation state check test circuit, parameters of the circuit breaker insulation state check test circuit are obtained by solving the equivalent model, where the parameters of the circuit breaker insulation state check test circuit are parameter values ​​of electronic components used to construct the circuit breaker insulation state check test circuit; Based on the obtained parameters of the circuit breaker insulation state check test circuit, the circuit breaker insulation state check test circuit generates a voltage waveform for a circuit breaker insulation state check test.

12. A circuit breaker insulation status inspection test method according to claim 11, characterized in that: The circuit breaker synthetic voltage source circuit includes: main capacitor, ignition ball, power frequency reactance, main reactance, frequency modulation resistor, frequency modulation capacitor, discharge resistor, time delay capacitor and test piece; The time delay capacitor is connected in parallel at both ends of the test piece, one end of the test piece is grounded, and the other end thereof is connected to one end of the main reactance, the other end of the main reactance is connected to one end of the ignition ball, the other end of the ignition ball is connected to one end of the main capacitor, the other end of the main capacitor is grounded, one end of the power frequency reactance is connected to the other end of the main reactance, the other end of the power frequency reactance is grounded, one end of the frequency modulation resistor is connected to one end of the main reactance, the other end of the frequency modulation resistor is connected to one end of the frequency modulation capacitor, the other end of the frequency modulation capacitor is grounded, one end of the discharge resistor is connected to the other end of the frequency modulation resistor, and the other end of the discharge resistor is grounded.

13. A circuit breaker insulation status inspection test method according to claim 12, characterized in that: The circuit breaker insulation state inspection test circuit under different conditions is obtained by switching corresponding electronic components on the basis of the constructed circuit breaker synthetic voltage source circuit, specifically including: Remove the power frequency reactance and discharge resistance in the circuit breaker synthetic voltage source circuit, set the frequency modulation capacitor in the circuit breaker synthetic voltage source circuit to 0, and obtain the circuit breaker insulation status inspection test circuit; Alternatively, the power frequency reactance in the circuit breaker synthetic voltage source circuit can be removed to obtain the circuit breaker insulation status inspection test circuit; Alternatively, the discharge resistor in the circuit breaker synthetic voltage source circuit is removed to obtain the circuit breaker insulation status inspection test circuit.

14. A circuit breaker insulation status inspection test method according to claim 13, characterized in that: The power frequency reactance and discharge resistance in the circuit breaker synthetic voltage source circuit are removed, and the frequency modulation capacitor in the circuit breaker synthetic voltage source circuit is set to 0, thereby obtaining a circuit breaker insulation status inspection test circuit, which includes: a main capacitor, an ignition ball, a main reactance, a frequency modulation resistor, a time delay capacitor, and a test piece; The time delay capacitor is connected in parallel at both ends of the test piece, one end of the test piece is grounded, and the other end is connected to one end of the main reactance, the other end of the main reactance is connected to one end of the ignition ball, the other end of the ignition ball is connected to one end of the main capacitor, the other end of the main capacitor is grounded, one end of the frequency modulation resistor is connected to one end of the main reactance, and the other end of the frequency modulation resistor is grounded.

15. A circuit breaker insulation status inspection test method according to claim 13, characterized in that: The power frequency reactance in the circuit breaker synthetic voltage source circuit is withdrawn to obtain a circuit breaker insulation state inspection test circuit, which includes: a main capacitor, an ignition ball, a main reactance, a frequency modulation resistor, a frequency modulation capacitor, a discharge resistor, a time delay capacitor and a test piece; The time delay capacitor is connected in parallel at both ends of the test piece, one end of the test piece is grounded, and the other end is connected to one end of the main reactance, the other end of the main reactance is connected to one end of the ignition ball, the other end of the ignition ball is connected to one end of the main capacitor, the other end of the main capacitor is grounded, one end of the frequency modulation resistor is connected to one end of the main reactance, the other end of the frequency modulation resistor is connected to one end of the frequency modulation capacitor, the other end of the frequency modulation capacitor is grounded, one end of the discharge resistor is connected to the other end of the frequency modulation resistor, and the other end of the discharge resistor is grounded.

16. A circuit breaker insulation status inspection test method according to claim 13, characterized in that: The discharge resistor in the circuit breaker synthetic voltage source circuit is exited to obtain a circuit breaker insulation state inspection test circuit, which includes: main capacitor, ignition ball, power frequency reactance, main reactance, frequency modulation resistor, frequency modulation capacitor, time delay capacitor and test piece; The time delay capacitor is connected in parallel at both ends of the test piece, one end of the test piece is grounded, and the other end is connected to one end of the main reactance, the other end of the main reactance is connected to one end of the ignition ball, the other end of the ignition ball is connected to one end of the main capacitor, the other end of the main capacitor is grounded, one end of the power frequency reactance is connected to the other end of the main reactance, the other end of the power frequency reactance is grounded, one end of the frequency modulation resistor is connected to one end of the main reactance, the other end of the frequency modulation resistor is connected to one end of the frequency modulation capacitor, and the other end of the frequency modulation capacitor is grounded.

17. A circuit breaker insulation status inspection test method according to claim 13, characterized in that: The equivalent model for establishing the relationship between the per-unit value of the break voltage and time of the tested high-voltage AC circuit breaker is expressed as: Where u(t) represents the voltage waveform used for the circuit breaker insulation condition inspection test, t represents time, ω0 represents the undamped oscillation angular frequency, ω represents the damped oscillation angular frequency, δ and β are symbols used to simplify the expression, R1 represents the parameter value of the frequency modulation resistor, C d Indicates the parameter value of the delay capacitor, L h Indicates the parameter value of the main reactance.

18. A circuit breaker insulation status inspection test method according to claim 17, characterized in that: By removing the power frequency reactance and discharge resistance in the circuit breaker synthetic voltage source circuit and setting the frequency modulation capacitor in the circuit breaker synthetic voltage source circuit to 0, the circuit breaker insulation state check test circuit is obtained. Based on the circuit breaker insulation state check test circuit, the parameters of the circuit breaker insulation state check test circuit are obtained by solving the equivalent model, including: In satisfaction and Under the condition of t=3ms, K af represents the amplitude coefficient, C h Indicates the parameter value of the main capacitor: According to the following formula make K is obtained according to the following formula af : According to the following formula, we can obtain ω·t t : According to the following formula, δ is obtained: Where, t t The time coordinate corresponding to the tangent point between the straight line passing through the origin and the voltage waveform, t c The time coordinate of the intersection of the straight line passing through the origin and tangent to the voltage waveform and the straight line passing over the voltage peak and horizontal to the time coordinate axis; ω is obtained by ω = mδ; Calculate t2 according to the following formula, where t2 represents the time coordinate corresponding to the maximum value of the voltage waveform: After ω and δ are determined, the parameter value of the main reactance L is selected according to the circuit breaker being tested. h ,Depend on and Determine the parameter value of the delay capacitor C d , the parameter value of the frequency modulation resistor R1 and the parameter value of the main capacitor C h , thus obtaining the parameters of the circuit breaker insulation status inspection test circuit: L h 、C d , R1 and C h .

19. A circuit breaker insulation condition inspection test method according to claim 17, characterized in that: By removing the power frequency reactance from the circuit breaker synthetic voltage source circuit, a circuit breaker insulation state check test circuit is obtained. Based on the circuit breaker insulation state check test circuit, the parameters of the circuit breaker insulation state check test circuit are obtained by solving the equivalent model, including: In satisfaction and Under the condition of t=3ms, K af represents the amplitude coefficient, C h Indicates the parameter value of the main capacitor: According to the following formula make K is obtained according to the following formula af : According to the following formula, we can obtain ω·t t : According to the following formula, δ is obtained: Where, t t The time coordinate corresponding to the tangent point between the straight line passing through the origin and the voltage waveform, t c The time coordinate of the intersection of the straight line passing through the origin and tangent to the voltage waveform and the straight line passing over the voltage peak and horizontal to the time coordinate axis; ω is obtained by ω = mδ; Calculate t2 according to the following formula, where t2 represents the time coordinate corresponding to the maximum value of the voltage waveform: After ω and δ are determined, the parameter value of the main reactance L is selected according to the circuit breaker being tested. h ,Depend on and Determine the parameter value of the delay capacitor C d , the parameter value of the frequency modulation resistor R1 and the parameter value of the main capacitor C h ; According to C1 = 20C d and 4R d C1<3s, calculate the parameter value of the FM capacitor C1 and the parameter value of the discharge resistor R D , thus obtaining the parameters of the circuit breaker insulation status inspection test circuit: L h 、C d , R1, C h , C1 and R D .

20. A circuit breaker insulation condition inspection test method according to claim 17, characterized in that: By removing the discharge resistor from the circuit breaker synthetic voltage source circuit, a circuit breaker insulation state check test circuit is obtained. Based on the circuit breaker insulation state check test circuit, the parameters of the circuit breaker insulation state check test circuit are obtained by solving the equivalent model, specifically including: In satisfaction and Under the condition of t=3ms, K af represents the amplitude coefficient, C h Indicates the parameter value of the main capacitor: According to the following formula make K is obtained according to the following formula af : According to the following formula, we can obtain ω·t t : According to the following formula, δ is obtained: Where, t t The time coordinate corresponding to the tangent point between the straight line passing through the origin and the voltage waveform, t c The time coordinate of the intersection of the straight line passing through the origin and tangent to the voltage waveform and the straight line passing over the voltage peak and horizontal to the time coordinate axis; ω is obtained by ω = mδ; Calculate t2 according to the following formula, where t2 represents the time coordinate corresponding to the maximum value of the voltage waveform: After ω and δ are determined, the parameter value of the main reactance L is selected according to the circuit breaker being tested. h ,Depend on and Determine the parameter value of the delay capacitor C d , the parameter value of the frequency modulation resistor R1 and the parameter value of the main capacitor C h ; According to C1=20C d , calculate the parameter value C1 of the frequency modulation capacitor; The parameter value L of the power frequency reactance is calculated according to the following formula: pf : Thus, the parameters of the circuit breaker insulation status inspection test circuit are obtained: L h 、C d , R1, C h , C1 and L pf .

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