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
Inactive Publication Date: 2018-04-27
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY +2
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Problems solved by technology
[0003] The power distribution network of the prior art cannot quickly determine the fault and the effect of judging the fault line is poor
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[0039] see figure 1 , which is a flow diagram of a preferred implementation of a method for quickly judging a single-phase ground fault line in a distribution network of a power supply system according to the present invention. The method for quickly judging the single-phase ground fault line of the distribution network of the power supply system in this embodiment includes steps:
[0040] S1: Real-time monitoring of PT (Potential transformer, PT for short) secondary side open triangle voltage or head-end zero-sequence current of each feeder and branch line and generate monitoring information, and judge whether the system has single-phase according to the monitoring information Ground Fault;
[0041] S3: When it is judged that a single-phase ground fault occurs, monitor the displacement voltage state of the neutral point and the state of the three-phase voltage, and determine the fault phase according to the displacement voltage state of the neutral point and the state of the...
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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.
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...
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CPCG01R31/086
Inventor 艾绍贵文习山吴旭涛陈小月李秀广王羽马波倪阳丁培周姣闫振华蓝磊何宁辉李永福张施令蔡伟陈凯
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY