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Group angular difference based fault phase judging method and device

An angle difference and fault technology, which is applied in the field of fault phase judgment method and device based on group angle difference, can solve problems such as easy misjudgment, and achieve the effect of high accuracy and avoiding fault expansion.

Active Publication Date: 2018-11-30
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0004] This application provides a fault phase judgment method and device based on group angle difference to solve the problem that existing phase judgment methods are prone to misjudgment when the system is running in an over-compensated or under-compensated state

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  • Group angular difference based fault phase judging method and device
  • Group angular difference based fault phase judging method and device

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Embodiment Construction

[0048] The arc suppression coil is a kind of compensation device used in the small current grounding system. When a single-phase ground fault occurs in the system, the arc suppression coil generates an inductive current to compensate the ground capacitance current, so that the current passing through the ground point is lower than the intermittent arc or maintains stability. The current value required by the arc can eliminate the arc at the grounding point. The grounding of the neutral point through the arc suppression coil is one of the most widely used neutral point grounding methods in the 6-66kV distribution network in my country. The current distribution of the arc suppressing coil grounding system under single-phase ground fault is as follows: figure 1 shown.

[0049]When a single-phase ground fault occurs in a power network whose neutral point is grounded by an arc suppression coil, the zero-sequence fundamental wave current contained in the current flowing through the...

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Abstract

The embodiment of the invention discloses a group angular difference based fault phase judging method and device. The method comprises the steps of obtaining a three-phase voltage, a zero-sequence voltage and a zero-sequence current of a power system; judging whether the zero-sequence voltage is beyond a preset threshold value; if the zero-sequence voltage is beyond the preset threshold value, determining a compensation state of an arc extinction coil based on a phase angle relationship between the zero-sequence current and the zero-sequence voltage of all the circuits of a power system; and outputting a fault phase signal based on the compensation state of the arc extinction coil. The group angular difference based fault phase judging method and device solve the problem of single-phase grounded fault phase judgment of the arc extinction coil in over-compensation and under-compensation states efficiently, have high accuracy and can avoid the problem that inter-phase short circuit caused by erroneous judgment results in fault enlargement.

Description

technical field [0001] The present application relates to the technical field of electric power systems, in particular to a fault phase determination method and device based on group angle difference. Background technique [0002] Single-phase ground fault is the most likely type of fault in distribution network faults. In order to ensure the reliability of power supply and ensure personal safety, arc suppression coil grounding and small resistance grounding are generally used in my country. The grounding method of the arc suppression coil can effectively compensate the capacitive current of the system to the ground, reduce the recovery speed of the arc gap voltage, improve the arc gap insulation strength, prevent the arc from reigniting and cause intermittent connection voltage, avoid the expansion of accidents caused by the arc, and ensure the safety of the distribution network Reliable operation. With the wide application of power cables, the capacitive current of the di...

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Application Information

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IPC IPC(8): G01R31/08H02J3/00
CPCG01R31/08H02J3/00
Inventor 刘红文王科
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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