Fast judgment method and system for power supply system distribution network single phase grounding fault line

A single-phase ground fault and power supply system technology, applied in the field of electric power engineering, can solve the problems that the distribution network cannot quickly determine the fault, and the effect of judging the fault line is poor, so as to achieve the effect of high judgment efficiency and good accuracy
CN107966633AInactive Publication Date: 2018-04-27ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY
Publication Date
2018-04-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a fast judgment method and a system for a power supply system distribution network single phase grounding fault line. The method comprises steps: open delta voltage of a secondary side of a PT or first end zero sequence current of each feeder line or a branch line is monitored in real time, monitoring information is generated, and whether single phase grounding fault happens to the system is judged according to the monitoring information; when the single phase grounding fault is judged, a neutral point displacement voltage state and a three-phase voltage state are monitored, and according to the neutral point displacement voltage state and the three-phase voltage state, a fault phase is determined; and fast switching closing is carried out on a bus fault phase, first end zero sequence current change features of each feeder line and each branch line are monitored and analyzed at the same time, and according to the zero sequence current change features of each feeder line and each branch line, a fault line is selected. The method and the system disclosed in the invention have the advantages of accurate and high-efficiency fault line judgment.
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Description

technical field

[0001] The invention relates to the technical field of electric power engineering, in particular to a method and system for quickly judging a single-phase ground fault line of a distribution network of a power supply system. Background technique

[0002] The distribution network generally adopts the neutral point non-effective grounding method, and the single-phase ground fault is the most common fault form in the distribution network. Because the fault current is small, the line voltage of the system is basically unchanged, and the supply to the user can continue, so it is generally allowed to take Single-phase ground fault operation 1 ~ 2h. However, for arcing ground faults, if the grounding arc exists for a long time, the intermittent arc overvoltage will appear repeatedly, which will cause damage to the equipment and line insulation in the system. In the distribution network system, internal overvoltage, lightning strikes, bird damage, disconnection, tre...

Claims

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