Current full compensation method and system based on single-phase earth fault

A single-phase grounding fault and grounding capacitance technology, applied in the field of power system, can solve the problem of inability to directly measure fault current

Pending Publication Date: 2018-08-24
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Application Information

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Problems solved by technology

[0005] The present invention provides a current full compensation method and system based on a single-phase ground fault to

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  • Current full compensation method and system based on single-phase earth fault
  • Current full compensation method and system based on single-phase earth fault
  • Current full compensation method and system based on single-phase earth fault

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Embodiment Construction

[0045] Please refer to the attached figure 1 , with figure 1 A schematic flowchart of a current full compensation method based on a single-phase ground fault provided by the embodiment of the present application is shown. attached by figure 1 It can be seen that the current full compensation method based on single-phase ground fault provided in the embodiment of the present application specifically includes:

[0046] S01: Obtain the bus voltage, zero-sequence current and zero-sequence voltage of the three-phase transmission line in real time.

[0047]The current transmission lines are usually three-phase transmission lines, that is, A-phase transmission lines, B-phase transmission lines and C-phase transmission lines. In the embodiment of this application, the control device in the current full compensation system based on single-phase ground fault (hereinafter referred to as the current full compensation system) collects the bus voltage, zero-sequence current and zero-sequ...

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Abstract

The invention provides a current full compensation method and a system based on single-phase earth fault. When zero sequence voltage is not in a preset voltage value range, namely, the happened single-phase earth fault is instant ground connection, an arc extinction coil device with high flexibility in high-resistance ground connection can compensate ground connection capacitive current. When thezero sequence voltage is in the preset voltage value range, namely, the happened single-phase earth fault is not instant ground connection, a breaker in a fault phase transfer ground connection deviceconnected with a fault phase is turned off, fault current is converted into earth current, and a compensable compensation device is further utilized to output full compensation fault residual current. The fault current is converted into the earth current, the earth current can serve as tracking compensation signals of the compensable compensation device, and judgment reference is provided for a compensation effect of the compensable compensation device. In addition, the earth current can be determined by measurement; furthermore, measurement is convenient, and complex calculation is avoided;thus, compensation quickness and accuracy are ensured, compensation precision is improved, and fault points are shielded.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method and system for full current compensation based on a single-phase ground fault. Background technique [0002] The neutral point grounding of the power grid refers to the electrical connection between the neutral point and the earth in the three-phase AC power system, that is, the neutral point potential is fixed to the ground potential. According to whether the neutral point is effectively grounded, the power system is divided into a large current grounding system, that is, a neutral point effective grounding system, and a small current grounding system, that is, a neutral point ineffective grounding system. In a small current grounding system, when a single-phase grounding fault occurs, the fault point will not generate a large short-circuit current because the neutral point is not effectively grounded, so the power system can be allowed to operate with a fault in ...

Claims

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Application Information

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IPC IPC(8): H02H9/08G01R19/00
CPCH02H9/08G01R19/0092
Inventor 刘红文王科李瑞桂
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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