A test circuit for static arc extinguishing capability of high voltage AC circuit breaker

Abstract

The present invention discloses a test circuit for the static arc extinguishing ability of a high-voltage AC circuit breaker. At the beginning of the test, a controller controls the first switch to close and controls the second switch and the third switch to open; when the high-voltage AC circuit breaker to be tested is opened, the controller controls the first switch to open, and then controls the second switch to close when the high-voltage AC circuit breaker to be tested is opened for a preset time; when the second switch is closed for a second preset time, the controller controls the second switch to open and controls the third switch to close; wherein, when the high-voltage AC circuit breaker to be tested is opened for the preset time, the contact in the arc extinguishing chamber of the high-voltage AC circuit breaker to be tested reaches the opening termination position and the arc extinguishing medium is in a hot state. By implementing the present invention, the static arc extinguishing ability of a high-voltage AC circuit breaker can be tested when the arc extinguishing medium is in a hot state and the high-voltage AC circuit breaker is in a static condition.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage AC circuit breaker testing, and in particular to a testing circuit for static arc extinguishing capability of a high-voltage AC circuit breaker. Background Art

[0002] When a power system is struck by lightning and causes a short circuit, the circuit breaker will open and interrupt the short circuit current. In the short time (tens to hundreds of milliseconds) after the circuit breaker interrupts the short circuit current, if the line is struck by lightning again, one end of the circuit breaker will be subjected to the system power frequency voltage and the other end will be subjected to the lightning overvoltage. Since the arc extinguishing medium and hot ions in the arc extinguishing chamber of the circuit breaker may still be in an unstable state (that is, the arc extinguishing medium is in a hot state), the internal insulation tolerance level of the circuit breaker is different from the prototype state under the type test conditions specified in the current standards. The circuit breaker under such system conditions may encounter more severe overvoltage shocks than the type test specified in the current standards. After the circuit breaker interrupts the short circuit current in the system, if a short circuit is caused by lightning again in a very short time, whether it can interrupt the short circuit current again, there is currently no standard assessment.

[0003] Therefore, it is urgent to test the ability of the high-voltage AC circuit breaker to interrupt the short-circuit current again after short-circuit breaking under the hot condition of the arc extinguishing medium and when the high-voltage AC circuit breaker is under static conditions (static conditions refer to the contacts in the arc extinguishing chamber reaching the opening end position and no longer moving). Summary of the invention

[0004] The embodiment of the present invention provides a test circuit for the static arc extinguishing capability of a high-voltage AC circuit breaker, which can test the static arc extinguishing capability of the high-voltage AC circuit breaker under the hot working condition of the arc extinguishing medium and the high-voltage AC circuit breaker under static conditions.

[0005] An embodiment of the present invention provides a test circuit for static arc extinguishing capability of a high-voltage AC circuit breaker, comprising: a first current source module, a second current source module, a voltage source module, a first switch, a second switch, a third switch, a high-voltage AC circuit breaker to be tested, a first current measuring device, a first voltage measuring device and a controller;

[0006] The first end of the first current source module is connected to the first end of the first switch, the second end of the first switch is connected to the first end of the high-voltage AC circuit breaker to be tested, the second end of the high-voltage AC circuit breaker to be tested is connected to the first end of the first current measuring device, the second end of the first current measuring device is connected to the second end of the first current source module, and the second end of the first current source module is grounded;

[0007] The first end of the second switch is connected to the first end of the high-voltage AC circuit breaker to be tested, the second end of the second switch is connected to the first end of the second current source module, and the second end of the second current source module is grounded;

[0008] The first end of the third switch is connected to the first end of the high-voltage AC circuit breaker to be tested, the second end of the third switch is connected to the first end of the voltage source module, and the second end of the voltage source module is grounded;

[0009] The first end of the first voltage measuring device is connected to the first end of the high-voltage AC circuit breaker to be tested, and the second end of the first voltage measuring device is grounded;

[0010] The controller is used to control the first switch to close, and the second switch and the third switch to open at the beginning of the test; control the first switch to open when the high-voltage AC circuit breaker to be tested is opened, and then control the second switch to close when the high-voltage AC circuit breaker to be tested is opened for a preset time; control the second switch to open and the third switch to close when the second switch is closed for a second preset time, wherein, when the high-voltage AC circuit breaker to be tested is opened for the preset time, the contacts in the arc extinguishing chamber of the high-voltage AC circuit breaker to be tested reach the opening termination position and the arc extinguishing medium is in a hot working condition.

[0011] Further, it also includes: a second current measuring device, a third current measuring device and a second voltage measuring device;

[0012] The first end of the second voltage measuring device is connected to the first end of the first current source module, and the second end of the second voltage measuring device is grounded; the second end of the first current source module is connected in series with the second current measuring device and then grounded; the first end of the third current measuring device is grounded, and the second end of the third current measuring device is respectively connected to the second end of the voltage source module and the second end of the second current source module.

[0013] Furthermore, the first current source module includes: a generator and a transformer; the generator is connected to the low-voltage winding of the transformer; the first end of the high-voltage winding of the transformer is the first end of the first current source module, and the second end of the high-voltage winding of the transformer is the second end of the first current source module.

[0014] Furthermore, the first current source module further includes: a first protection switch, a first closing switch, a first operating switch, a first reactor, a second protection switch, a second closing switch and a second operating switch;

[0015] The first end of the generator, the first protection switch, the first closing switch, the first operating switch, the first reactor and the first end of the low-voltage winding of the transformer are connected in sequence; the second end of the low-voltage winding of the transformer, the second operating switch, the second closing switch, the second protection switch and the second end of the generator are connected in sequence.

[0016] Furthermore, the first current source module also includes: a first discharge protection spherical gap; the first end of the first discharge protection spherical gap is connected to the first end of the high-voltage winding of the transformer, and the second end of the first discharge protection spherical gap is connected to the second end of the high-voltage winding of the transformer.

[0017] Furthermore, the first current source module also includes: a first capacitor and a first resistor; the first end of the first resistor is connected to the first end of the high-voltage winding of the transformer, the second end of the first resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is connected to the second end of the high-voltage winding of the transformer.

[0018] Furthermore, the first current source module also includes: an arc extension device; a first end of the arc extension device is connected to a first end of the high-voltage winding of the transformer, and a second end of the arc extension device is connected to a second end of the high-voltage winding of the transformer.

[0019] Furthermore, the second current source module includes: a second reactor, a second discharge protection spherical gap and a second capacitor;

[0020] The first end of the second inductor is the first end of the second current source module, the second end of the second inductor is connected to the first end of the second discharge protection spherical gap, the second end of the second discharge protection spherical gap is connected to the first end of the second capacitor, and the second end of the second capacitor is the second end of the second current source module.

[0021] Further, the voltage source module includes: a third reactor, a third discharge protection spherical gap, a third capacitor and a TRV frequency modulation unit;

[0022] The first end of the third inductor is the first end of the voltage source module, the second end of the third inductor is connected to the first end of the third discharge protection spherical gap, the second end of the third discharge protection spherical gap is connected to the first end of the third capacitor, and the second end of the third capacitor is the second end of the voltage source module; the first end of the TRV frequency modulation unit is connected to the first end of the third inductor, and the second end of the TRV frequency modulation unit is connected to the second end of the third capacitor.

[0023] The following beneficial effects are achieved by implementing the embodiments of the present invention:

[0024] The present invention provides a test circuit for the static arc extinguishing ability of a high-voltage AC circuit breaker. At the beginning of the test, the controller controls the first switch to close, the second switch and the third switch to open, and at this time, only the first current source module provides short-circuit current for the high-voltage AC circuit breaker to be tested. After a period of flow, the high-voltage AC end circuit breaker to be tested is disconnected while controlling the first switch to be disconnected; this step simulates the situation in which the high-voltage AC circuit breaker is disconnected and the short-circuit current is disconnected after a short-circuit fault occurs in the actual situation. Immediately after the high-voltage AC circuit breaker to be tested is disconnected for a preset time (at this time, the contact in the arc extinguishing chamber of the high-voltage AC circuit breaker to be tested reaches the disconnection termination position and the arc extinguishing medium is in a hot state), the second switch is controlled to close, and at this time, only the second power supply module provides current for the high-voltage AC circuit breaker to be tested, and the arc in the arc extinguishing chamber is maintained after the high-voltage AC circuit breaker to be tested is disconnected, thereby simulating the situation in which the short-circuit current occurs after the high-voltage AC circuit breaker is disconnected and is in a static condition in the actual process, due to sudden situations such as lightning strikes and being broken down again. Then, when the second switch is closed for a second preset time, the second switch is controlled to open and the third switch is controlled to close. At this time, the voltage source module provides voltage to the high-voltage AC circuit breaker to be tested, thereby simulating the transient recovery voltage formed at both ends of the high-voltage AC circuit breaker after the high-voltage AC circuit breaker breaks the short-circuit current for the second time. Finally, the static arc extinguishing capability of the high-voltage AC circuit breaker to be tested can be evaluated by the break voltage of the high-voltage AC circuit breaker measured by the first voltage measuring device and the break voltage measured by the first current measuring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a schematic circuit diagram of a test circuit for the static arc extinguishing capability of a high-voltage AC circuit breaker provided in one embodiment of the present invention.

[0026] Description of the accompanying drawings: first current source module 1, second current source module 2, voltage source module 3, first switch AB1, second switch AB2, third switch AB3, high-voltage AC circuit breaker to be tested T0, first current measuring device I1, first voltage measuring device V1, second current measuring device I2, third current measuring device I3, second voltage measuring device V2, generator G, transformer PT, first protection switch GB1, first closing switch MS1, first operating switch MB1, first reactor L1, second protection switch GB2, second closing switch MS2, second operating switch MB2, first discharge protection spherical gap GP1, first capacitor C1, first resistor R1, arc extension device AP, second reactor L2, second discharge protection spherical gap GP2, second capacitor C2, third reactor L3, third discharge protection spherical gap GP3, third capacitor C3, TRV frequency modulation unit TRV; DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0028] Figure 1 As shown, an embodiment of the present invention provides a test circuit for static arc extinguishing capability of a high-voltage AC circuit breaker, comprising: a first current source module 1, a second current source module 2, a voltage source module 3, a first switch AB1, a second switch AB2, a third switch AB3, a high-voltage AC circuit breaker T0 to be tested, a first current measuring device I1, a first voltage measuring device V1 and a controller (not shown in the figure);

[0029] The first end of the first current source module 1 is connected to the first end of the first switch AB1, the second end of the first switch AB1 is connected to the first end of the high-voltage AC circuit breaker T0 to be tested, the second end of the high-voltage AC circuit breaker T0 to be tested is connected to the first end of the first current measuring device I1, the second end of the first current measuring device I1 is connected to the second end of the first current source module 1, and the second end of the first current source module 1 is grounded;

[0030] The first end of the second switch AB2 is connected to the first end of the high-voltage AC circuit breaker T0 to be tested, the second end of the second switch AB2 is connected to the first end of the second current source module 2, and the second end of the second current source module 2 is grounded;

[0031] The first end of the third switch AB3 is connected to the first end of the high-voltage AC circuit breaker T0 to be tested, the second end of the third switch AB3 is connected to the first end of the voltage source module 3, and the second end of the voltage source module 3 is grounded;

[0032] The first end of the first voltage measuring device V1 is connected to the first end of the high-voltage AC circuit breaker T0 to be tested, and the second end of the first voltage measuring device V1 is grounded;

[0033] The controller is used to control the first switch AB1 to close, and control the second switch AB2 and the third switch AB3 to open at the beginning of the test; when the high-voltage AC circuit breaker T0 to be tested is disconnected, control the first switch AB1 to open, and then control the second switch AB2 to close when the high-voltage AC circuit breaker T0 to be tested is disconnected for a preset time; when the second switch AB2 is closed for a second preset time, control the second switch AB2 to open and control the third switch AB3 to close; wherein, when the high-voltage AC circuit breaker T0 to be tested is disconnected for the preset time, the contacts in the arc extinguishing chamber of the high-voltage AC circuit breaker T0 to be tested reach the opening termination position and the arc extinguishing medium is in a hot working condition.

[0034] In this embodiment, at the beginning of the test, the controller controls the first switch AB1 to close, the second switch AB2 and the third switch AB3 to open, and at this time, only the first current source module 1 provides short-circuit current for the high-voltage AC circuit breaker T0 to be tested. After the current flows for a period of time, the high-voltage AC circuit breaker to be tested is disconnected and the first switch AB1 is controlled to be disconnected; this step simulates the situation in which the high-voltage AC circuit breaker is opened to disconnect the short-circuit current after a short-circuit fault occurs in the actual situation. Then, when the high-voltage AC circuit breaker T0 to be tested is opened for a preset time (at this time, the contacts in the arc extinguishing chamber of the high-voltage AC circuit breaker T0 to be tested reach the opening termination position and the arc extinguishing medium is in a hot state), the second switch AB2 is controlled to close. At this time, only the second power supply module provides current to the high-voltage AC circuit breaker T0 to be tested, so as to maintain the arc in the arc extinguishing chamber after the high-voltage AC circuit breaker T0 to be tested is opened, thereby simulating the situation in which a short-circuit current occurs after the high-voltage AC circuit breaker is in a static condition after being opened in an actual process and is broken down again due to sudden situations such as lightning strikes. Then, when the second switch AB2 is closed for a second preset time, the second switch AB2 is controlled to be opened and the third switch AB3 is controlled to be closed. At this time, the voltage source module 3 provides voltage to the high-voltage AC circuit breaker T0 to be tested, thereby simulating the transient recovery voltage formed at both ends of the high-voltage AC circuit breaker after the high-voltage AC circuit breaker breaks the short-circuit current again. Finally, the static arc extinguishing capability of the high-voltage AC circuit breaker T0 to be tested can be evaluated by the break voltage of the high-voltage AC circuit breaker measured by the first voltage measuring device V1 and the break voltage measured by the first current measuring device I1.

[0035] In a preferred embodiment, it further comprises: a second current measuring device I2, a third current measuring device I3 and a second voltage measuring device V2;

[0036] The first end of the second voltage measuring device V2 is connected to the first end of the first current source module 1, and the second end of the second voltage measuring device V2 is grounded; the second end of the first current source module 1 is connected in series with the second current measuring device I2 and then grounded; the first end of the third current measuring device I3 is grounded, and the second end of the third current measuring device I3 is respectively connected to the second end of the voltage source module 3 and the second end of the second current source module 2. The values ​​measured by the second current measuring device I2, the third current measuring device I3 and the third voltage measuring device can assist in analyzing whether the test loop works as expected.

[0037] In a preferred embodiment, the first current source module 1 includes: a generator G and a transformer PT; the generator G is connected to the low-voltage winding of the transformer PT; the first end of the high-voltage winding of the transformer PT is the first end of the first current source module 1, and the second end of the high-voltage winding of the transformer PT is the second end of the first current source module 1.

[0038] In a preferred embodiment, the first current source module 1 also includes: a first protection switch GB1, a first closing switch MS1, a first operating switch MB1, a first reactor L1, a second protection switch GB2, a second closing switch MS2 and a second operating switch MB2; the first end of the generator G, the first protection switch GB1, the first closing switch MS1, the first operating switch MB1, the first reactor L1 and the first end of the low-voltage winding of the transformer PT are connected in sequence; the second end of the low-voltage winding of the transformer PT, the second operating switch MB2, the second closing switch MS2, the second protection switch GB2 and the second end of the generator G are connected in sequence.

[0039] In a preferred embodiment, the first current source module 1 further includes: a first discharge protection spherical gap GP1; a first end of the first discharge protection spherical gap GP1 is connected to a first end of the high-voltage winding of the transformer PT, and a second end of the first discharge protection spherical gap GP1 is connected to a second end of the high-voltage winding of the transformer PT. In this embodiment, the first discharge protection spherical gap GP1 is connected in parallel with the transformer PT to prevent the overvoltage of the voltage source module 3 from causing damage to the transformer PT.

[0040] In a preferred embodiment, the first current source module 1 further includes: a first capacitor C1 and a first resistor R1; the first end of the first resistor R1 is connected to the first end of the high-voltage winding of the transformer PT, the second end of the first resistor R1 is connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is connected to the second end of the high-voltage winding of the transformer PT. In this embodiment, the first capacitor C1 and the first resistor R1 can be used to adjust the rising rate of the recovery voltage after the high-voltage AC circuit breaker T0 to be tested breaks a large current.

[0041] In a preferred embodiment, the first current source module 1 further includes: an arc extension device AP; a first end of the arc extension device AP is connected to a first end of the high-voltage winding of the transformer PT, and a second end of the arc extension device AP is connected to a second end of the high-voltage winding of the transformer PT. In this embodiment, the arc extension device AP is used to ensure that the high-voltage AC circuit breaker T0 to be tested can maintain current under a longer arcing time.

[0042] In a preferred embodiment, the second current source module 2 includes: a second inductor L2, a second discharge protection spherical gap GP2 and a second capacitor C2; the first end of the second inductor L2 is the first end of the second current source module 2, the second end of the second inductor L2 is connected to the first end of the second discharge protection spherical gap GP2, the second end of the second discharge protection spherical gap GP2 is connected to the first end of the second capacitor C2, and the second end of the second capacitor C2 is the second end of the second current source module 2.

[0043] In a preferred embodiment, the voltage source module 3 includes: a third inductor L3, a third discharge protection spherical gap, a third capacitor C3 and a TRV frequency modulation unit TRV; the first end of the third inductor L3 is the first end of the voltage source module 3, the second end of the third inductor L3 is connected to the first end of the third discharge protection spherical gap, the second end of the third discharge protection spherical gap is connected to the first end of the third capacitor C3, and the second end of the third capacitor C3 is the second end of the voltage source module 3; the first end of the TRV frequency modulation unit TRV is connected to the first end of the third inductor L3, and the second end of the TRV frequency modulation unit TRV is connected to the second end of the third capacitor C3.

[0044] Illustratively, in a preferred embodiment, the test principle of the static arc extinguishing capability test circuit of the high voltage AC circuit breaker provided by the present invention is as follows:

[0045] In a preferred embodiment of the present invention, at the beginning of the test, the controller controls the first protection switch GB1 to close, the first closing switch MS1 to close, the first operating switch MB1 to close, the first switch AB1 to close, the high-voltage AC circuit breaker T0 to be tested to close, the second protection switch GB2 to close, the second closing switch MS2 to close, the second operating switch MB2 to close, the second switch AB2 to open, and the third switch AB3 to open. At this time, the high-voltage AC circuit breaker T0 to be tested is only connected to the first current source module 1 composed of the generator G, and bears the short-circuit current. The second current source module 2 is isolated by the second switch AB2, and the voltage source module 3 is isolated by the third switch AB3, and they are all in a charging completion state.

[0046] After the high-voltage AC circuit breaker T0 to be tested has been conducting current for a period of time (50ms to 100ms), the controller controls the first switch AB1 and the high-voltage AC circuit breaker T0 to be tested to open, and ensures that the two are disconnected at the same current zero-crossing moment through timing control. After the high-voltage AC circuit breaker T0 to be tested is disconnected for a preset time (10ms to 100ms, the specific time is adjusted according to the actual situation, as long as the arc extinguishing medium in the high-voltage AC circuit breaker can be kept in a hot working condition and the contacts in the arc extinguishing chamber reach the opening termination position), the second switch AB2 is controlled to close, and the second discharge protection ball gap GP2 is penetrated to introduce the second current source module 2 in the charging completion state, and other switches continue to protect the original state. At this time, only the second current source module 2 provides current for the high-voltage AC circuit breaker T0 to be tested, thereby simulating the situation in which the high-voltage AC circuit breaker is in a static condition after being disconnected in the actual process, and is broken down again due to sudden situations such as lightning strikes and other emergencies. Next, when the second switch AB2 is closed for a second preset time (40ms to 60ms), the controller controls the second switch AB2 to open, controls the third switch AB3 to close, and the other switches remain in their original states. At this time, the third discharge protection ball gap penetrates, and the voltage source module 3 in the charging complete state is introduced. At this time, only the voltage source module 3 provides voltage for the high-voltage AC circuit breaker T0 to be tested, thereby simulating the transient recovery voltage formed at both ends of the high-voltage AC circuit breaker T0 after the high-voltage AC circuit breaker breaks the short-circuit current again, and testing whether the high-voltage AC circuit breaker to be tested can withstand the transient recovery voltage applied at this time. Finally, the static arc extinguishing capability of the high-voltage AC circuit breaker T0 to be tested is evaluated by the numerical value, waveform and current-carrying time displayed by the first current measuring device I1 and the first voltage measuring device V1. It should be noted that it is an existing technology to evaluate the static arc extinguishing capability of the high-voltage AC circuit breaker T0 to be tested by the numerical value, waveform and current-carrying time displayed by the first current measuring device I1 and the first voltage measuring device V1, and the specific evaluation method will not be expanded here.

[0047] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A test circuit for static arc extinguishing capability of a high voltage AC circuit breaker, characterized in that: include: A first current source module, a second current source module, a voltage source module, a first switch, a second switch, a third switch, a high-voltage AC circuit breaker to be tested, a first current measuring device, a first voltage measuring device and a controller; The first end of the first current source module is connected to the first end of the first switch, the second end of the first switch is connected to the first end of the high-voltage AC circuit breaker to be tested, the second end of the high-voltage AC circuit breaker to be tested is connected to the first end of the first current measuring device, the second end of the first current measuring device is connected to the second end of the first current source module, and the second end of the first current source module is grounded; The first end of the second switch is connected to the first end of the high-voltage AC circuit breaker to be tested, the second end of the second switch is connected to the first end of the second current source module, and the second end of the second current source module is grounded; The first end of the third switch is connected to the first end of the high-voltage AC circuit breaker to be tested, the second end of the third switch is connected to the first end of the voltage source module, and the second end of the voltage source module is grounded; The first end of the first voltage measuring device is connected to the first end of the high-voltage AC circuit breaker to be tested, and the second end of the first voltage measuring device is grounded; The controller is used to control the first switch to close and the second switch and the third switch to open at the beginning of the test; when the high-voltage AC circuit breaker to be tested is disconnected, control the first switch to open, and then control the second switch to close when the high-voltage AC circuit breaker to be tested is disconnected for a preset time; When the second switch is closed for a second preset time, controlling the second switch to open and controlling the third switch to close; The static arc extinguishing capability of the high-voltage AC circuit breaker to be tested is evaluated by the break voltage of the high-voltage AC circuit breaker measured by the first voltage measuring device and the break voltage measured by the first current measuring device; wherein, when the high-voltage AC circuit breaker to be tested is opened for a preset time, the contacts in the arc extinguishing chamber of the high-voltage AC circuit breaker to be tested reach the opening termination position and the arc extinguishing medium is in a hot state; The static arc extinguishing capacity refers to the ability of the break to interrupt the short-circuit current again when the contacts in the arc extinguishing chamber reach the opening end position and do not move any more.

2. The test circuit for static arc extinguishing capability of a high voltage AC circuit breaker according to claim 1, characterized in that: Also includes: a second current measuring device, a third current measuring device, and a second voltage measuring device; The first end of the second voltage measuring device is connected to the first end of the first current source module, and the second end of the second voltage measuring device is grounded; the second end of the first current source module is connected in series with the second current measuring device and then grounded; the first end of the third current measuring device is grounded, and the second end of the third current measuring device is respectively connected to the second end of the voltage source module and the second end of the second current source module.

3. The test circuit for static arc extinguishing capability of a high voltage AC circuit breaker according to claim 1, characterized in that: The first current source module comprises: a generator and a transformer; The generator is connected to the low-voltage winding of the transformer; the first end of the high-voltage winding of the transformer is the first end of the first current source module, and the second end of the high-voltage winding of the transformer is the second end of the first current source module.

4. The test circuit for static arc extinguishing capability of a high voltage AC circuit breaker according to claim 3, characterized in that: The first current source module further includes: a first protection switch, a first closing switch, a first operating switch, a first reactor, a second protection switch, a second closing switch and a second operating switch; The first end of the generator, the first protection switch, the first closing switch, the first operating switch, the first reactor and the first end of the low-voltage winding of the transformer are connected in sequence; the second end of the low-voltage winding of the transformer, the second operating switch, the second closing switch, the second protection switch and the second end of the generator are connected in sequence.

5. The test circuit for static arc extinguishing capability of a high voltage AC circuit breaker according to claim 3, characterized in that: The first current source module also includes: a first discharge protection spherical gap; the first end of the first discharge protection spherical gap is connected to the first end of the high-voltage winding of the transformer, and the second end of the first discharge protection spherical gap is connected to the second end of the high-voltage winding of the transformer.

6. The test circuit for static arc extinguishing capability of a high voltage AC circuit breaker according to claim 3, characterized in that: The first current source module also includes: a first capacitor and a first resistor; the first end of the first resistor is connected to the first end of the high-voltage winding of the transformer, the second end of the first resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is connected to the second end of the high-voltage winding of the transformer.

7. The test circuit for static arc extinguishing capability of a high voltage AC circuit breaker according to claim 3, characterized in that: The first current source module also includes: an arc extension device; a first end of the arc extension device is connected to a first end of the high-voltage winding of the transformer, and a second end of the arc extension device is connected to a second end of the high-voltage winding of the transformer.

8. The test circuit for static arc extinguishing capability of a high voltage AC circuit breaker according to claim 1, characterized in that: The second current source module includes: a second reactor, a second discharge protection spherical gap and a second capacitor; The first end of the second inductor is the first end of the second current source module, the second end of the second inductor is connected to the first end of the second discharge protection spherical gap, the second end of the second discharge protection spherical gap is connected to the first end of the second capacitor, and the second end of the second capacitor is the second end of the second current source module.

9. The test circuit for static arc extinguishing capability of a high voltage AC circuit breaker according to claim 1, characterized in that: The voltage source module includes: a third reactor, a third discharge protection spherical gap, a third capacitor and a TRV frequency modulation unit; The first end of the third inductor is the first end of the voltage source module, the second end of the third inductor is connected to the first end of the third discharge protection spherical gap, the second end of the third discharge protection spherical gap is connected to the first end of the third capacitor, and the second end of the third capacitor is the second end of the voltage source module; the first end of the TRV frequency modulation unit is connected to the first end of the third inductor, and the second end of the TRV frequency modulation unit is connected to the second end of the third capacitor.

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