Method for locating fault point of operation failure of residual current protection device in low-voltage distribution line

A residual current and protection device technology, applied in the direction of fault location, etc., can solve problems such as failure of the device to be put into operation, increase of maintenance costs, weak user awareness, etc., and achieve the effect of improving the fault detection rate and improving the reliability of power supply

Inactive Publication Date: 2011-05-25
国网江苏省电力有限公司溧阳市供电分公司 +1
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Problems solved by technology

As far as the current situation is concerned, the insulation level of the rural power grid is poor, the user awareness is weak, and the residual current is too large, which often causes the device to fail to be put into operation and affects the normal power supply operation of the line
[0003] At present, the operation and maintenance of

Method used

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  • Method for locating fault point of operation failure of residual current protection device in low-voltage distribution line
  • Method for locating fault point of operation failure of residual current protection device in low-voltage distribution line
  • Method for locating fault point of operation failure of residual current protection device in low-voltage distribution line

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] figure 1 , Distribution line phase line leakage fault judgment. Only electrify the outgoing line of phase A, and disconnect the other phase lines and neutral line. At this time, check whether the residual current protection device RCD is working normally. If it works normally, the outgoing line of phase A is not faulty; if it cannot work normally, the outgoing line of phase A is faulty . Check the B and C phase outlets according to the above method.

[0020] figure 2 , Judging the fault of the neutral line of the power supply line. After the above inspection is completed, when there is no fault in the three-phase outgoing line of A, B, and C, at the same time, the three-phase A, B, and C are energized to check whether the residual current protection device is working normally. If it works normally, the neutral line is not faulty; if not Works fine, fault...

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Abstract

The invention discloses a method for locating a fault point of an operation failure of a residual current protection device in a low-voltage distribution line, which improves fault point location efficiency and shortens location time. The method comprises the following steps: judging whether the residual current protection device is at fault; if not, judging whether a phase line and a neutral line of a low-voltage distribution line are at fault; and carrying out rapid judgment and location on the fault point according to the golden section method. The method disclosed by the method takes fulluse of the function of a residual current clamp meter.

Description

technical field [0001] The invention relates to a method for finding faults in low-voltage power distribution lines, in particular to a method for quickly finding leakage fault points by analyzing the reasons why residual current protection devices cannot be put into operation in low-voltage distribution networks. Background technique [0002] Installing a residual current protection device is an effective measure to prevent fault hazards caused by residual current in the low-voltage power grid. According to DLT499 "Rural Low-Voltage Electric Power Technical Regulations", most of my country's vast rural low-voltage power networks adopt TT system low-voltage distribution line outlets must be equipped with residual current protection devices. As far as the current situation is concerned, the insulation level of the rural power grid is poor, the user awareness is weak, and the residual current is too large, which often causes the device to fail to be put into operation and affe...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 梁锁宽张炜蒋茂忠吕忠云周敏跃章小兵朱遵义李兆扬陈亚军王瑞
Owner 国网江苏省电力有限公司溧阳市供电分公司
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