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

Abstract

The present invention discloses a test circuit for the static arc extinguishing ability of a high-voltage circuit breaker. During the test, a controller controls the first switch to close, the second switch to open, the third switch to open, and the fourth switch to open; when the high-voltage circuit breaker to be tested is opened, the controller controls the first switch to open and controls the fourth switch to close; when the high-voltage circuit breaker to be tested is opened for a preset time, the controller controls the fourth switch to open and the second switch to close; 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 circuit breaker to be tested is opened for a preset time, the contact in the arc extinguishing chamber of the high-voltage 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 circuit breaker can be tested when the arc extinguishing medium is in a hot state and the high-voltage circuit breaker is in a static condition.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breaker testing, and in particular to a testing circuit for static arc extinguishing capability of a high-voltage 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 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 circuit breaker is in 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 circuit breaker, which can test the static arc extinguishing capability of the high-voltage circuit breaker when the arc extinguishing medium is in a hot state and the high-voltage circuit breaker is in a static condition.

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

[0009] The first end of the fourth switch is connected to the first end of the high-voltage circuit breaker to be tested, the second end of the fourth switch is connected to the first end of the second voltage source module, and the second end of the second voltage source module is grounded;

[0010] The first end of the first voltage measuring device is connected to the first end of the high-voltage circuit breaker to be tested, and the second end of the first voltage measuring device is grounded;

[0011] The controller is used to control the first switch to close, the second switch to open, the third switch to open, and the fourth switch to open at the beginning of the test; when the high-voltage circuit breaker to be tested is opened, control the first switch to open and control the fourth switch to close; when the high-voltage circuit breaker to be tested is opened for a preset time, control the fourth switch to open and the second switch to close; when the second switch is closed for a second preset time, control the second switch to open and control the third switch to close; wherein, when the high-voltage circuit breaker to be tested is opened for the preset time, the contacts in the arc extinguishing chamber of the high-voltage circuit breaker to be tested reach the opening termination position and the arc extinguishing medium is in a hot working condition.

[0012] Furthermore, it also includes: a second current measuring device, a second voltage measuring device and a third current 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 first voltage source module, the second end of the second 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 also 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.

[0015] Furthermore, the first current source module also includes: a first discharge protection spherical gap; a first end of the first discharge protection spherical gap is connected to a first end of the high-voltage winding of the transformer, and a second end of the first discharge protection spherical gap is connected to a second end of the high-voltage winding of the transformer.

[0016] 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.

[0017] 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.

[0018] Furthermore, the second current source module includes: a second reactor, a second discharge protection spherical gap and a second capacitor;

[0019] 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.

[0020] Furthermore, the first voltage source module includes: a third reactor, a third discharge protection spherical gap, a third capacitor and a first TRV frequency modulation unit;

[0021] 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 first TRV frequency modulation unit is connected to the first end of the third inductor, and the second end of the first TRV frequency modulation unit is connected to the second end of the third capacitor.

[0022] Furthermore, the second voltage source module includes: a fourth reactor, a fourth discharge protection spherical gap, a fourth capacitor and a second TRV frequency modulation unit;

[0023] The first end of the fourth inductor is the first end of the second voltage source module, the second end of the fourth inductor is connected to the first end of the fourth discharge protection spherical gap, the second end of the fourth discharge protection spherical gap is connected to the first end of the fourth capacitor, and the second end of the fourth capacitor is the second end of the second voltage source module; the first end of the second TRV frequency modulation unit is connected to the first end of the fourth inductor, and the second end of the second TRV frequency modulation unit is connected to the second end of the fourth capacitor.

[0024] The following beneficial effects are achieved by implementing the embodiments of the present invention:

[0025] The present invention provides a test circuit for the static arc extinguishing capability of a high-voltage circuit breaker. At the beginning of the test, the controller controls the first switch to close, the second switch to open, the third switch to open, and the fourth switch to open. At this time, only the first current source module provides a short-circuit current for the high-voltage circuit breaker to be tested. After the current is passed for a period of time, the high-voltage circuit breaker to be tested is disconnected while the first switch is controlled to be disconnected; this step simulates the situation in which the high-voltage circuit breaker opens to disconnect the short-circuit current after a short-circuit fault occurs in an actual situation. While disconnecting the first switch, the fourth switch is controlled to close, and the second voltage source module is introduced into the high-voltage circuit breaker, thereby simulating the transient recovery voltage formed at both ends of the high-voltage circuit breaker after the high-voltage circuit breaker breaks the short-circuit current in an actual situation. Immediately after the high-voltage circuit breaker to be tested is opened for a preset time (at this time, the contacts in the arc extinguishing chamber of the high-voltage circuit breaker to be tested reach the opening termination position and the arc extinguishing medium is in a hot state), the fourth switch is controlled to open and the second switch is controlled to close. At this time, only the second power supply module provides current to the high-voltage circuit breaker to be tested, thereby simulating the situation in which a short-circuit current occurs after the high-voltage 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 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 first voltage source module provides voltage to the high-voltage circuit breaker to be tested, thereby simulating the transient recovery voltage formed at both ends of the high-voltage circuit breaker after the high-voltage circuit breaker breaks the short-circuit current for the second time. Finally, the static arc extinguishing capability of the high-voltage circuit breaker to be tested can be evaluated by the break voltage of the high-voltage 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

[0026] Figure 1 The present invention is a circuit diagram of a test circuit for the static arc extinguishing capability of a high-voltage circuit breaker provided in one embodiment of the present invention.

[0027] Description of reference numerals: first current source module 1, second current source module 2, first voltage source module 3, second voltage source module 4, first switch AB1, second switch AB2, third switch AB3, fourth switch AB4, high-voltage circuit breaker T0 to be tested, 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 , the first reactor L1, the second protection switch GB2, the second closing switch MS2, the second operating switch MB2, the first discharge protection spherical gap GP1, the first capacitor C1, the first resistor R1, the arc extension device AP, the second reactor L2, the second discharge protection spherical gap GP2, the second capacitor C2, the third reactor L3, the third discharge protection spherical gap GP3, the third capacitor C3, the first TRV frequency modulation unit TRV1, the fourth reactor L4, the fourth discharge protection spherical gap GP4, the fourth capacitor C4, the second TRV frequency modulation unit TRV2; DETAILED DESCRIPTION

[0028] 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.

[0029] like Figure 1 As shown, an embodiment of the present invention provides a test circuit for static arc extinguishing capability of a high-voltage circuit breaker, comprising: a first current source module 1, a second current source module 2, a first voltage source module 3, a second voltage source module 4, a first switch AB1, a second switch AB2, a third switch AB3, a fourth switch AB4, a high-voltage 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);

[0030] 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 circuit breaker T0 to be tested, the second end of the high-voltage 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;

[0031] The first end of the second switch AB2 is connected to the first end of the high-voltage 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;

[0032] The first end of the third switch AB3 is connected to the first end of the high-voltage circuit breaker T0 to be tested, the second end of the third switch AB3 is connected to the first end of the first voltage source module 3, and the second end of the first voltage source module 3 is grounded;

[0033] The first end of the fourth switch AB4 is connected to the first end of the high-voltage circuit breaker T0 to be tested, the second end of the fourth switch AB4 is connected to the first end of the second voltage source module 4, and the second end of the second voltage source module 4 is grounded;

[0034] The first end of the first voltage measuring device V1 is connected to the first end of the high-voltage circuit breaker T0 to be tested, and the second end of the first voltage measuring device V1 is grounded;

[0035] The controller is used to control the first switch AB1 to close, the second switch AB2 to open, the third switch AB3 to open, and the fourth switch AB4 to open at the beginning of the test; when the high-voltage circuit breaker T0 to be tested is opened, the first switch AB1 is controlled to open and the fourth switch AB4 is controlled to close; when the high-voltage circuit breaker T0 to be tested is opened for a preset time, the fourth switch AB4 is controlled to open and the second switch AB2 is controlled to close; when the second switch AB2 is closed for a second preset time, the second switch AB2 is controlled to open and the third switch AB3 is controlled to close; wherein, when the high-voltage circuit breaker T0 to be tested is opened for the preset time, the contacts in the arc extinguishing chamber of the high-voltage circuit breaker T0 to be tested reach the opening termination position and the arc extinguishing medium is in a hot working condition.

[0036] In this embodiment, at the beginning of the test, the controller controls the first switch AB1 to close, the second switch AB2 to open, the third switch AB3 to open, and the fourth switch AB4 to open. At this time, only the first current source module 1 provides short-circuit current for the high-voltage circuit breaker T0 to be tested. After the current flows for a period of time, the high-voltage circuit breaker T0 to be tested is disconnected while the first switch AB1 is controlled to be disconnected; this step simulates the situation in which the high-voltage circuit breaker opens to disconnect the short-circuit current after a short-circuit fault occurs in the actual situation. While disconnecting the first switch AB1, the fourth switch AB4 is controlled to be closed, and the second voltage source module 4 is introduced into the high-voltage circuit breaker T0 to be tested, thereby simulating the transient recovery voltage formed at both ends of the high-voltage circuit breaker after the high-voltage circuit breaker breaks the short-circuit current in an actual situation. Immediately after the high-voltage circuit breaker T0 to be tested is broken for a preset time (at this time, the contacts in the arc extinguishing chamber of the high-voltage circuit breaker T0 to be tested reach the opening termination position and the arc extinguishing medium is in a hot state), the fourth switch AB4 is controlled to be disconnected, and the second switch AB2 is controlled to be closed. At this time, only the second power supply module provides current to the high-voltage circuit breaker T0 to be tested, thereby simulating the situation in which the high-voltage circuit breaker is in a static condition after being broken down again due to sudden situations such as lightning strikes in an actual process and a short-circuit current occurs. 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 first voltage source module 3 provides voltage to the high-voltage circuit breaker T0 to be tested, thereby simulating the transient recovery voltage formed at both ends of the high-voltage circuit breaker after the high-voltage circuit breaker breaks the short-circuit current for the second time. Finally, the static arc extinguishing capability of the high-voltage circuit breaker T0 to be tested can be evaluated by the break voltage of the high-voltage circuit breaker measured by the first voltage measuring device V1 and the break voltage measured by the first current measuring device I1.

[0037] In a preferred embodiment, it further comprises: a second current measuring device I2, a second voltage measuring device V2 and a third current measuring device I3;

[0038] 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 first voltage source module 3, the second end of the second voltage source module 4, 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.

[0039] In a preferred embodiment, the first current source module 1 comprises: a generator G and a transformer PT;

[0040] 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 .

[0041] In a preferred embodiment, the first current source module 1 further 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;

[0042] 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.

[0043] 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 a 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 a 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 first voltage source module 3 and the second voltage source module 4 from damaging the transformer PT.

[0044] 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 circuit breaker T0 to be tested breaks a large current.

[0045] 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 circuit breaker T0 to be tested can maintain current under a longer arcing time.

[0046] 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.

[0047] In a preferred embodiment, the first voltage source module 3 comprises: a third reactor L3, a third discharge protection spherical gap GP3, a third capacitor C3 and a first TRV frequency modulation unit TRV1;

[0048] The first end of the third reactor L3 is the first end of the voltage source module, the second end of the third reactor L3 is connected to the first end of the third discharge protection sphere gap GP3, the second end of the third discharge protection sphere gap GP3 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; the first end of the first TRV frequency modulation unit TRV1 is connected to the first end of the third reactor L3, and the second end of the first TRV frequency modulation unit TRV1 is connected to the second end of the third capacitor C3.

[0049] In a preferred embodiment, the second voltage source module 4 includes: a fourth reactor L4, a fourth discharge protection spherical gap GP4, a fourth capacitor C4 and a second TRV frequency modulation unit TRV2;

[0050] The first end of the fourth reactor L4 is the first end of the second voltage source module 4, the second end of the fourth reactor L4 is connected to the first end of the fourth discharge protection sphere gap GP4, the second end of the fourth discharge protection sphere gap GP4 is connected to the first end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is the second end of the second voltage source module 4; the first end of the second TRV frequency modulation unit TRV2 is connected to the first end of the fourth reactor, and the second end of the second TRV frequency modulation unit TRV2 is connected to the second end of the fourth capacitor C4.

[0051] Illustratively, in a preferred embodiment, the test principle of the static arc extinguishing capability test circuit of the high voltage circuit breaker provided by the present invention is as follows:

[0052] 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 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, the third switch AB3 to open, and the fourth switch to open. At this time, the high-voltage 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, the first voltage source module 3 is isolated by the third switch AB3, and the second voltage source module 4 is isolated by the fourth switch AB4, and they are all in the charging completion state.

[0053] After the high-voltage circuit breaker T0 to be tested has been flowing with current for a period of time (50ms to 100ms), the controller controls the first switch AB1 to open, the high-voltage circuit breaker T0 to be tested to open, and controls the fourth switch AB4 to close, and the fourth discharge protection ball gap GP4 penetrates, and the timing control is used to ensure that the above operations are performed before the current passes through zero. At this time, the second power supply module provides voltage to the high-voltage circuit breaker T0 to be tested, thereby simulating the transient recovery voltage formed at both ends of the high-voltage circuit breaker after the high-voltage circuit breaker breaks the short-circuit current, and testing whether the high-voltage circuit breaker T0 to be tested can withstand the transient recovery voltage applied at this time. After the high-voltage circuit breaker T0 to be tested is opened 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 circuit breaker can be kept in a hot working condition and the contacts in the arc extinguishing chamber reach the opening termination position), the fourth switch AB4 is controlled to open and the second switch AB2 is closed, and the second discharge protection ball gap GP2 is penetrated to introduce the second current source module 2 in the charging complete state, and the other switches continue to protect the original state. At this time, only the second current source module 2 provides current for the high-voltage circuit breaker T0 to be tested, thereby simulating the situation in which the high-voltage circuit breaker is in a static condition after being opened in an actual process, and a short-circuit current occurs after being broken down again due to sudden situations such as lightning strikes. 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 and controls the third switch AB3 to close, and the other switches remain in their original state. At this time, the third discharge protection ball gap GP3 penetrates, and the first voltage source module 3 in the charging complete state is introduced. At this time, only the first voltage source module 3 provides voltage for the high-voltage circuit breaker T0 to be tested, thereby simulating the transient recovery voltage formed at both ends of the high-voltage circuit breaker after the high-voltage circuit breaker breaks the short-circuit current again, and testing whether the high-voltage circuit breaker can withstand the transient recovery voltage when it is broken again. Finally, the static arc extinguishing capability of the high-voltage circuit breaker T0 to be tested is evaluated by the numerical value, waveform and current-passing 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 circuit breaker T0 to be tested by the numerical value, waveform and current-passing 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.

[0054] 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 circuit breaker, characterized in that: include: A first current source module, a second current source module, a first voltage source module, a second voltage source module, a first switch, a second switch, a third switch, a fourth switch, a high-voltage 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 circuit breaker to be tested, the second end of the high-voltage 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 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 circuit breaker to be tested, the second end of the third switch is connected to the first end of the first voltage source module, and the second end of the first voltage source module is grounded; The first end of the fourth switch is connected to the first end of the high-voltage circuit breaker to be tested, the second end of the fourth switch is connected to the first end of the second voltage source module, and the second end of the second voltage source module is grounded; The first end of the first voltage measuring device is connected to the first end of the high-voltage 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, the second switch to open, the third switch to open, and the fourth switch to open at the beginning of the test; when the high-voltage circuit breaker to be tested is disconnected, control the first switch to open and control the fourth switch to close; when the high-voltage circuit breaker to be tested is disconnected for a preset time, control the fourth switch to open and the second switch to close; 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; wherein, when the high-voltage circuit breaker to be tested is opened for the preset time, the contacts in the arc extinguishing chamber of the high-voltage 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 of the high-voltage circuit breaker to be tested can be evaluated by the break voltage of the high-voltage circuit breaker measured by the first voltage measuring device and the break voltage measured by the first current measuring device; the definition of 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 termination position and do not move anymore.

2. The test circuit for static arc extinguishing capability of a high voltage circuit breaker according to claim 1, characterized in that: Also includes: a second current measuring device, a second voltage measuring device, and a third current 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 first voltage source module, the second end of the second 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 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 the static arc extinguishing capability of a high voltage 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 circuit breaker according to claim 3, characterized in that: The first current source module further includes: a first discharge protection spherical gap; a first end of the first discharge protection spherical gap is connected to a first end of the high-voltage winding of the transformer, and a second end of the first discharge protection spherical gap is connected to a second end of the high-voltage winding of the transformer.

6. The test circuit for static arc extinguishing capability of a high voltage 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 circuit breaker according to claim 3, characterized in that: The first current source module further 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 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 circuit breaker according to claim 1, characterized in that: The first voltage source module includes: a third reactor, a third discharge protection spherical gap, a third capacitor and a first 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 first TRV frequency modulation unit is connected to the first end of the third inductor, and the second end of the first TRV frequency modulation unit is connected to the second end of the third capacitor.

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

Images