Voltage test loop and method for state inspection of ultra-high-voltage alternating-current circuit breaker
By introducing an ultra-ultra-high voltage AC circuit breaker and resistor R3 into the voltage source circuit, the problem of insufficient insulation level after the voltage level is increased in the prior art is solved, and a high-precision and high-insulation voltage test circuit is realized, reducing the modification cost.
Patent Information
- Application Number
- CN202411738113.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-03-18
AI Technical Summary
In the prior art, a set of voltage source circuits is used as a voltage test for status checks. As the voltage level increases, the insulation level requirements of the entire test circuit cannot be met. If the circuits that have been built are transformed, a large investment cost is required.
An ultra-ultra-high voltage AC circuit breaker is provided as a voltage test circuit for state inspection. By using the first voltage source and the second voltage source, an ultra-ultra-high voltage AC circuit breaker is built as a voltage test circuit and control method for state inspection, including a main capacitor, an ignition ball and a frequency modulation branch, and a resistor R3 is used to suppress overvoltage and adjust the waveform parameters.
It improves the insulation level of the entire test loop and has high control accuracy, reduces the demand for the transformation of the original test loop and reduces cost investment.
Smart Images
Figure CN119644128A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of high-voltage AC circuit breaker large-capacity testing, and in particular relates to a voltage test circuit and method for an ultra-high voltage AC circuit breaker as a status check. Background Art
[0002] According to the standard "GB 1984-2014 High Voltage AC Circuit Breakers", after any test mode, the circuit breaker can be inspected, and its mechanical parts and insulating parts should be basically the same as before the test, and the appearance inspection is usually sufficient to verify the insulation performance. If there is any doubt, the inspection test according to the specified state is sufficient to verify its insulation performance.
[0003] GB 1984-2014 High Voltage AC Circuit Breakers stipulates that for circuit breakers of 363 kV and above, when conducting impulse voltage tests, the impulse voltage waveform should be a standard operating impulse or a TRV waveform specified in the outgoing line fault test method T10. Five impulses should be applied to each polarity. If no destructive discharge occurs, the circuit breaker is considered to have passed the test. When using synthetic test equipment in a large-capacity test room, the duration of the TRV waveform is The permissible deviations are -10% and +200%, and the TRV peak range is ±3%.
[0004] Comparative tests have shown that, whether the circuit breaker is new or burned, there is almost no difference in the performance of the circuit breaker when the test is carried out with the waveform of the TRV specified in the standard operating impulse or the TRV specified in the line fault T10. When the test is carried out with the waveform of the TRV specified in the line fault T10, the equivalence with the standard operating impulse is guaranteed if the following rules are met: - the damping of the TRV should make the second peak value of the TRV oscillation not higher than 80% of the first peak value; - about 2.5 ms after the peak value, the actual value of the recovery voltage should be more than 50% of the peak value. The standard stipulates that for 550 kV 1100 kV circuit breakers should be subjected to impulse voltage tests. The peak value of the impulse voltage should be 90% of the rated operating impulse withstand voltage given in Table 2 of GB / T 11022. For GIS circuit breakers, the peak value of the impulse voltage should be 90% of the rated operating impulse withstand voltage given in Table 103 of GB 7674. At present, in actual operation, various power companies basically use a set of voltage source circuits for voltage tests as status checks. During the test, this test method has increasingly stringent requirements on the insulation level of the entire test circuit as the voltage level increases. If the voltage test requirements for status checks are to be met, the insulation level of the circuit needs to be improved, which is difficult to achieve for most laboratories. In addition, if the already built circuit is to be modified, a large investment cost is required. Summary of the invention
[0005] The object of the present invention is to provide a voltage test circuit and method for an ultra-high voltage AC circuit breaker as a status check. On the one hand, it is used to solve the problem in the prior art that a set of voltage source circuits as a voltage test for status check cannot meet the insulation level requirements of the entire test circuit as the voltage level increases; on the other hand, it is used to solve the technical defect that if an already built circuit is to be modified, a large investment cost is required.
[0006] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, a voltage test circuit for an ultra-high voltage AC circuit breaker as a status check is provided, characterized in that it includes: A first voltage source is connected in series to one end of the circuit breaker TO under test, and a first control switch is provided on the first power source; A second voltage source is connected in series to the other end of the tested circuit breaker TO, and a second control switch is provided on the second voltage source; The first control switch is used to control the first voltage source to apply voltage to one end of the tested circuit breaker TO; the second control switch is used for the second voltage source to apply voltage to the other end of the tested circuit breaker TO at a specific time.
[0007] Further, the first voltage source includes a main capacitor Cs1, an ignition ball GP1 and a first frequency modulation branch, one end of the main capacitor Cs1 is connected to one end of the ignition ball GP1, and the other end is connected to one end of the first frequency modulation branch, and the other end of the ignition ball GP1 is connected to the first path of the other end of the first frequency modulation branch; The second path at the other end of the first frequency modulation branch is connected to a first voltage measuring end, and the other end of the first voltage measuring end is connected to one end of the tested circuit breaker TO.
[0008] Furthermore, the first frequency modulation branch includes Ls1, R1, C1, delay capacitor C2 and R2, one end of the Ls1 is divided into two paths, one path is connected to one end of Cs1 through the ignition ball GP1, and the other path is connected to one end of R1; The other end of Ls1 is divided into three paths, one of which is connected to one end of C1 via R2, the second is connected to one end of the delay capacitor C2, and the third is connected to the first voltage measurement end; The other end of Cs1 is connected to the other end of R1, the other end of C1, the other end of the delay capacitor C2, and the current I respectively.
[0009] Furthermore, the first control switch is a ball gap switch.
[0010] Further, the second voltage source includes a main capacitor Cs2, an ignition ball GP2 and a second frequency modulation branch, one end of the main capacitor Gs2 is connected to one end of the ignition ball GP2, and the other end is connected to a first path at one end of the second frequency modulation branch, and the other end of the ignition ball GP2 is connected to the first path at the other end of the second frequency modulation branch; The second path at one end of the second frequency modulation branch is connected to the current I, and the second path at the other end of the second frequency modulation branch is connected to the second voltage measuring end, and the second voltage measuring end is connected to the other end of the tested circuit breaker TO.
[0011] Furthermore, the second frequency modulation branch includes Ls2, R3, R4 and a time delay capacitor C3, one end of the Ls2 is divided into two paths, one path is connected to one end of Gs2 via the ignition ball GP2, and the other path is connected to one end of R4; The other end of Ls2 is divided into two paths after passing through R3, one end is connected to V, and the other end is connected to one end of R3; The other end of the delay capacitor C3 is divided into three paths, one path is connected to the other end of R4, the second path is connected to the other end of Gs2, and the third path is connected to the current I.
[0012] Furthermore, the second control switch is controlled by a delay device.
[0013] Furthermore, the second voltage source is used to suppress the overvoltage generated when the tested circuit breaker TO breaks down.
[0014] In a second aspect, a voltage test method for an ultra-high voltage AC circuit breaker as a status check is provided, wherein the method is performed using the ultra-high voltage AC circuit breaker as described above as a voltage test circuit for status check, and comprises: When the circuit breaker T0 under test is in the open state, the first voltage source and the second voltage source are in the charging complete state; The ignition ball GP1 is controlled to ignite, and the first voltage source applies voltage to one end of the circuit breaker under test; The ignition ball GP2 of the second voltage source is controlled by a time delay device to ignite at a specific time after the first voltage source is turned on, and together with the first voltage source, provides the voltage in the voltage test of the status check.
[0015] Furthermore, the specific time is 100us after the first voltage source is turned on.
[0016] Compared with the prior art, the present invention has the following beneficial effects: The test circuit uses the first voltage source and the second voltage source to build a test circuit and control method for voltage testing of an ultra-high voltage AC circuit breaker as a status check. Compared with a traditional set of voltage source test circuits, the circuit has high control accuracy. The method uses resistor R3 to suppress the overvoltage generated when the circuit breaker under test breaks down, and resistor R3 can also adjust the waveform parameters according to standard requirements. The insulation level of the entire test circuit is improved; at the same time, there is no need to carry out large-scale transformation of the original test circuit, and only the corresponding voltage source needs to be added, which reduces the cost investment. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.
[0018] Figure 1 Schematic diagram of voltage test for status check; Figure 2 A schematic diagram of the voltage test circuit structure of the ultra-high voltage AC circuit breaker provided by the present invention as a status check; Figure 3 A flow chart of a voltage test method for status inspection of an ultra-high voltage AC circuit breaker provided by the present invention. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.
[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0022] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0023] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0024] According to the standard "GB 1984-2014 High Voltage AC Circuit Breakers", after any test mode, the circuit breaker can be inspected, and its mechanical parts and insulating parts should be basically the same as before the test, and the appearance inspection is usually sufficient to verify the insulation performance. If there is any doubt, the inspection test according to the specified state is sufficient to verify its insulation performance.
[0025] GB 1984-2014 High Voltage AC Circuit Breakers stipulates that for circuit breakers of 363 kV and above, when conducting impulse voltage tests, the impulse voltage waveform should be a standard operating impulse or a TRV waveform specified in the outgoing line fault test method T10. Five impulses should be applied to each polarity. If no destructive discharge occurs, the circuit breaker is considered to have passed the test. When using synthetic test equipment in a large-capacity test room, the duration of the TRV waveform is The permissible deviations are -10% and +200%, and the TRV peak range is ±3%.
[0026] Comparative tests have shown that, whether the circuit breaker is new or burned, there is almost no difference in the performance of the circuit breaker when the test is carried out with the waveform of the TRV specified in the standard operating impulse or the TRV specified in the line fault T10. When the test is carried out with the waveform of the TRV specified in the line fault T10, the equivalence with the standard operating impulse is guaranteed if the following rules are met: - the damping of the TRV should make the second peak value of the TRV oscillation not higher than 80% of the first peak value; - about 2.5 ms after the peak value, the actual value of the recovery voltage should be more than 50% of the peak value. The standard stipulates that for 550 kV 1100 kV circuit breakers should be subjected to impulse voltage tests. The peak value of the impulse voltage should be 90% of the rated operating impulse withstand voltage given in Table 2 of GB / T 11022. For GIS circuit breakers, the peak value of the impulse voltage should be 90% of the rated operating impulse withstand voltage given in Table 103 of GB 7674. At present, in actual operation, various power companies basically use a set of voltage source circuits for voltage tests as status checks. During the test, this test method has increasingly stringent requirements on the insulation level of the entire test circuit as the voltage level increases. If the voltage test requirements for status checks are to be met, the insulation level of the circuit needs to be improved, which is difficult to achieve for most laboratories. In addition, if the already built circuit is to be modified, a large investment cost is required.
[0027] In order to solve the above technical defects, the inventor provides a voltage test circuit and method for status inspection of an ultra-high voltage AC circuit breaker.
[0028] The present invention is further described in detail below in conjunction with the accompanying drawings: First, as Figure 2 As shown, an embodiment of the present invention provides a voltage test circuit for a UHV AC circuit breaker as a status check, including a first voltage source connected in series to one end of the circuit breaker under test, and a first control switch is provided on the first power source; a second voltage source connected in series to the other end of the circuit breaker under test, and a second control switch is provided on the second voltage source; wherein the first control switch is used to control the first voltage source to apply voltage to one end of the circuit breaker under test; and the second control switch is used for the second voltage source to apply voltage to the other end of the circuit breaker under test at a specific time. In the design of the circuit scheme, the test circuit, by using the first voltage source and the second voltage source, builds a test circuit for a voltage test of an UHV AC circuit breaker as a status check. Compared with a traditional set of voltage source test circuits, the control accuracy of the circuit is high. The method uses the resistor R3 to suppress the overvoltage generated when the circuit breaker under test breaks down, and the resistor R3 can also adjust the waveform parameters according to the standard requirements. And improve the insulation level of the entire test circuit; at the same time, there is no need to carry out large-scale transformation of the original test circuit, only the corresponding voltage source needs to be added, which reduces the cost investment. As shown Figure 2As shown, the first voltage source includes a main capacitor Cs1, an ignition ball GP1 and a first frequency modulation branch. One end of the main capacitor Cs1 is connected to one end of the ignition ball GP1, and the other end is connected to one end of the first frequency modulation branch. The other end of the ignition ball GP1 is connected to the first path of the other end of the first frequency modulation branch; the second path of the other end of the first frequency modulation branch is connected to a first voltage measuring end, and the other end of the first voltage measuring end is connected to one end of the circuit breaker TO under test. In this process, the main capacitor Cs1, as an energy storage element, can provide a stable voltage output during the test, and by adjusting the capacity of the main capacitor Cs1, the output voltage of the first voltage source can be accurately controlled to meet the voltage requirements under different test conditions; the ignition ball GP1 is used to trigger the discharge process of the voltage source at the beginning of the test. By accurately controlling the triggering timing and triggering conditions of the ignition ball GP1, it can be ensured that the first voltage source is discharged at a predetermined time point and method during the test, thereby improving the accuracy and controllability of the test. The first frequency modulation branch is used to adjust the output frequency of the voltage source to meet the frequency requirements under different test conditions. By adjusting the parameters of the first frequency modulation branch, the output frequency of the first voltage source can be accurately controlled, thereby ensuring that the frequency of the voltage during the test is consistent with the actual operating conditions and improving the accuracy and reliability of the test; and the main capacitor Cs1, as an energy storage element, can absorb and release energy during the test, thereby reducing the fluctuation and impact of the voltage source, helping to protect the circuit breaker under test and other test equipment from damage caused by voltage fluctuations and impacts, and improving the safety and reliability of the test circuit. Figure 2As shown, further, the first frequency modulation branch includes Ls1, R1, C1, time delay capacitor C2 and R2, one end of Ls1 is divided into two paths, one path is connected to one end of Cs1 through the ignition ball GP1, and the other path is connected to one end of R1; the other end of Ls1 is divided into three paths, one path is connected to one end of C1 through R2, the second path is connected to one end of the time delay capacitor C2, and the third path is connected to the first voltage measurement end; the other end of Cs1 is respectively connected to the other end of R1, the other end of C1, the other end of the time delay capacitor C2, and the current I. The components such as resistor R1, inductor Ls1 and capacitor C1 can form a resonant circuit. By adjusting the parameters of these components, the resonant frequency of the frequency modulation branch can be accurately controlled. This resonance effect helps to provide a stable voltage output at a specific frequency, thereby improving the accuracy and stability of frequency regulation; secondly, resistors R1, R2 and R3 play a damping role in the circuit, which can reduce the fluctuation of voltage and current, making the output of the frequency modulation branch more stable. In this solution, the first control switch is a ball gap switch, which can accurately control the timing of discharge, ensuring that the discharge process of the voltage source is triggered at a predetermined time point and under predetermined conditions, which helps to simulate various voltage conditions in actual operation, thereby more accurately evaluating the insulation performance of the circuit breaker. In addition, the ball gap switch can play a certain protective role in the discharge process, preventing damage to the test equipment due to excessive voltage or current. By reasonably setting the parameters of the ball gap switch, the voltage and current in the discharge process can be limited to ensure the safe operation of the test equipment. Figure 2As shown, the second voltage source includes a main capacitor Cs2, an ignition ball GP2 and a second frequency modulation branch, one end of the main capacitor Gs2 is connected to one end of the ignition ball GP2, and the other end is connected to the first path at one end of the second frequency modulation branch, and the other end of the ignition ball GP2 is connected to the first path at the other end of the second frequency modulation branch; the second path at one end of the second frequency modulation branch is connected to the current I, and the second path at the other end of the second frequency modulation branch is connected to the second voltage measuring end, and the second voltage measuring end is connected to the other end of the circuit breaker TO under test. As the main energy storage element of the second voltage source, the main capacitor Cs2 can provide a large amount of electric energy in a short time to meet the test's demand for high-voltage electric energy. Its large capacity and fast discharge characteristics help to generate stable and high-intensity voltage pulses in the test, thereby improving the accuracy and effectiveness of the test. As a trigger element, the ignition ball GP2 can quickly generate a discharge phenomenon after receiving a trigger signal, thereby triggering the discharge process of the main capacitor Cs2. Its high trigger sensitivity and rapid discharge characteristics help to ensure that the voltage source generates the required voltage pulses at a predetermined time and under conditions. The second frequency modulation branch includes Ls2, R3, R4 and a time-delay capacitor C3. One end of Ls2 is divided into two paths, one path is connected to one end of Gs2 through the ignition ball GP2, and the other path is connected to one end of R4; the other end of Ls2 is divided into two paths after passing through R3, one path is connected to V, and the other end is connected to one end of R3; the other end of the time-delay capacitor C3 is divided into three paths, one path is connected to the other end of R4, the second path is connected to the other end of Gs2, and the third path is connected to the current I; the second control switch is controlled by the time delay device, and the second voltage source is used to suppress the overvoltage generated when the tested circuit breaker TO breaks down.
[0029] Further, components such as resistor R4, inductor Ls2 and capacitor Cd1 can form a resonant circuit. By accurately adjusting the parameters of these components, a specific resonant frequency can be set, thereby achieving precise control of the output frequency. This resonance effect helps to provide a stable voltage or current output at a specific frequency, and improves the accuracy and stability of frequency regulation. The resistor R3 plays a damping role in the circuit, which helps to reduce the fluctuation of voltage and current, and makes the output of the frequency modulation branch more stable. In this solution, the second control switch is a delay control switch, which can perform switching actions according to a preset time delay, thereby accurately controlling the operation sequence of each component in the system. This precise timing control helps to ensure the coordinated operation between the various parts of the system and improve the stability and reliability of the overall system. Secondly, by setting a reasonable delay time, the delay control switch can avoid system malfunctions caused by instantaneous interference or misoperation, which helps to reduce the occurrence of system failures and improve the stability and safety of the system.
[0030] In a second aspect, an embodiment of the present invention provides a voltage test method for an ultra-high voltage AC circuit breaker as a status check, wherein the method is performed using the test circuit as described above, such as Figure 3 As shown, including: S101, while the tested circuit breaker T0 is in the open state, the first voltage source and the second voltage source are in the charging completed state; illustratively, when the test starts, the tested circuit breaker T0 is in the open state, which can ensure that the circuit breaker will not accidentally connect the circuit before the test starts, thereby preventing short circuit or electric shock accidents caused by misoperation; the first voltage source and the second voltage source are in the charging completed state, which can ensure that when the test starts, the first voltage source and the second voltage source can immediately provide the required voltage and current without waiting for the charging process, which helps to save test time and avoid waste of voltage source energy. In the open state, the insulation part of the tested circuit breaker T0 is in an unconnected state. At this time, the voltage test as a status check can more accurately measure its insulation performance, help to find potential insulation defects, ensure the quality and reliability of the circuit breaker, and at the same time, it can avoid the interference of the internal components of the circuit breaker during the test. The measurement results of the insulation performance are affected. Ensuring that the first voltage source and the second voltage source are fully charged can ensure the stability of the voltage and current during the test, further improving the accuracy of the test.
[0031] S102, control the ignition ball GP1 to ignite, and the first voltage source applies voltage to one end of the circuit breaker under test; illustratively, controlling the ignition switch action of the ignition ball GP1 can accurately trigger the ignition process, thereby ensuring that the test is carried out at a predetermined time point and under conditions, which can reduce the error and uncertainty of the test and improve the accuracy of the test results; and the first voltage source applies voltage to one end of the test product T0, and by adjusting the output voltage of the first voltage source, different test conditions can be simulated to evaluate the performance of the test product under different voltages.
[0032] S103, using a timer to control the ignition ball GP2 of the second voltage source, ignite and put it in at a specific time after the first voltage source is put into operation, and jointly provide the voltage in the voltage test for status inspection with the first voltage source; illustratively, by means of a timer, the ignition ball GP2 of the second voltage source is controlled to ignite and put it in 100us after the first voltage source 1 is put into operation, and the second voltage source is put into operation to apply the recovery voltage to the other end of the circuit breaker sample T0 under test, at this time, there are two sets of voltage sources acting on both ends of the circuit breaker sample T0, which jointly provide the voltage for the voltage test for status inspection. In the whole process, by using the first voltage source and the second voltage source, a voltage test circuit for status inspection of the ultra-high voltage AC circuit breaker is built. Compared with a traditional set of voltage source test circuits, the control accuracy of this circuit is high. This method can suppress the overvoltage generated when the circuit breaker under test breaks down by using the resistor R3, and the resistor R3 can also adjust the waveform parameters according to the standard requirements, and improve the insulation level of the entire test circuit; at the same time, there is no need to carry out large-scale transformation of the original test circuit, and only the corresponding voltage source needs to be added, which reduces the cost investment.
[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.
Claims
1. A voltage test circuit for ultra-high voltage AC circuit breaker as a status check, characterized in that: include: A first voltage source is connected in series to one end of the circuit breaker TO under test, and a first control switch is provided on the first power source; A second voltage source is connected in series to the other end of the tested circuit breaker TO, and a second control switch is provided on the second voltage source; The first control switch is used to control the first voltage source to apply voltage to one end of the tested circuit breaker TO; the second control switch is used for the second voltage source to apply voltage to the other end of the tested circuit breaker TO at a specific time.
2. The voltage test circuit of the ultra-high voltage AC circuit breaker as a status check according to claim 1 is characterized in that: The first voltage source includes a main capacitor Cs1, an ignition ball GP1 and a first frequency modulation branch, one end of the main capacitor Cs1 is connected to one end of the ignition ball GP1, and the other end is connected to one end of the first frequency modulation branch, and the other end of the ignition ball GP1 is connected to the first path of the other end of the first frequency modulation branch; The second path at the other end of the first frequency modulation branch is connected to a first voltage measuring end, and the other end of the first voltage measuring end is connected to one end of the tested circuit breaker TO.
3. The voltage test circuit of the ultra-high voltage AC circuit breaker as claimed in claim 2 is used as a status check, characterized in that: The first frequency modulation branch includes Ls1, R1, C1, delay capacitors C2 and R2, one end of Ls1 is divided into two paths, one path is connected to one end of Cs1 through the ignition ball GP1, and the other path is connected to one end of R1; The other end of Ls1 is divided into three paths, one of which is connected to one end of C1 via R2, the second is connected to one end of the delay capacitor C2, and the third is connected to the first voltage measurement end; The other end of Cs1 is connected to the other end of R1, the other end of C1, the other end of the delay capacitor C2, and the current I respectively.
4. The voltage test circuit of the ultra-high voltage AC circuit breaker as claimed in claim 1 is used as a status check, characterized in that: The first control switch is a ball gap switch.
5. The voltage test circuit of the ultra-high voltage AC circuit breaker as claimed in claim 1 is used as a status check, characterized in that: The second voltage source includes a main capacitor Cs2, an ignition ball GP2 and a second frequency modulation branch, one end of the main capacitor Gs2 is connected to one end of the ignition ball GP2, and the other end is connected to a first path at one end of the second frequency modulation branch, and the other end of the ignition ball GP2 is connected to the first path at the other end of the second frequency modulation branch; The second path at one end of the second frequency modulation branch is connected to the current I, and the second path at the other end of the second frequency modulation branch is connected to the second voltage measuring end, and the second voltage measuring end is connected to the other end of the tested circuit breaker TO.
6. The voltage test circuit for status inspection of the ultra-high voltage AC circuit breaker according to claim 5 is characterized in that: The second frequency modulation branch includes Ls2, R3, R4 and a time delay capacitor C3, one end of Ls2 is divided into two paths, one path is connected to one end of Gs2 via the ignition ball GP2, and the other path is connected to one end of R4; The other end of Ls2 is divided into two paths after passing through R3, one end is connected to V, and the other end is connected to one end of R3; The other end of the delay capacitor C3 is divided into three paths, one path is connected to the other end of R4, the second path is connected to the other end of Gs2, and the third path is connected to the current I.
7. The voltage test circuit of the ultra-high voltage AC circuit breaker as claimed in claim 1 is used as a status check, characterized in that: The second control switch is controlled by a delay device.
8. The voltage test circuit of the ultra-high voltage AC circuit breaker as claimed in claim 1 is used as a status check, characterized in that: The second voltage source is used to suppress the overvoltage generated when the tested circuit breaker TO breaks down.
9. A voltage test method for ultra-high voltage AC circuit breaker status inspection, characterized in that: The method is performed using the verification loop according to any one of claims 1 to 8, comprising: When the circuit breaker T0 under test is in the open state, the first voltage source and the second voltage source are in the charging complete state; The ignition ball GP1 is controlled to ignite, and the first voltage source applies voltage to one end of the circuit breaker under test; The ignition ball GP2 of the second voltage source is controlled by a time delay device to ignite at a specific time after the first voltage source is turned on, and together with the first voltage source, provides the voltage in the voltage test of the status check.
10. The voltage test method for checking the status of an ultra-high voltage AC circuit breaker according to claim 9, characterized in that: The specific time is 100us after the first voltage source is turned on.