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Power cable line cross interconnection box fault positioning method and device

A cable line and power cable technology, applied in the field of cable detection, can solve problems such as unsuitable cable cross-connection grounding, simulation results and conclusions that are difficult to apply to multi-loop power cable lines, etc., and achieve a concise and direct positioning method

Pending Publication Date: 2020-11-24
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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AI Technical Summary

Problems solved by technology

The analytical method is too simple to calculate and is not suitable for the cross-connection grounding of most cables. The power cable model built in the ATP-EMTP software does not take into account the electromagnetic coupling phenomenon in the multi-circuit power cable line, and its simulation results and conclusions are difficult to apply. In multi-circuit power cable lines

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  • Power cable line cross interconnection box fault positioning method and device
  • Power cable line cross interconnection box fault positioning method and device
  • Power cable line cross interconnection box fault positioning method and device

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Embodiment Construction

[0071] The present invention will be further described below. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0072] see figure 1 , the present invention provides a method for locating a fault in a power cable line cross interconnection box, comprising:

[0073] Monitor the current amplitude of the sheath at the first and last ends of the power cable line;

[0074] According to the change of the sheath current amplitude at the first and last ends of the power cable line, it is judged that a ground fault occurs in the cross-connection box;

[0075] Judging the fault type of the cross-connection box according to the phase number of the sheath current amplitude change at the first and last ends of the power cable line;

[0076] Based on the fault type of the cross-connection box, select the cable line of the corresponding phase, and calculate the r...

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Abstract

The invention discloses a power cable line cross interconnection box fault positioning method and device. The method comprises the following steps: judging whether a cross interconnection box has a ground fault or not and judging the fault type of the cross interconnection box according to the current amplitude change of sheaths at the head end and the tail end of a power cable line; selecting a cable line of a corresponding phase based on the fault type of the cross interconnection box, and calculating the current amplitude ratio of sheaths at the head and tail ends of the cable line of the selected phase; and performing fault positioning on the cross interconnection box based on the ratio. The positioning method is simple and direct, and is suitable for fault positioning of most power cable line cross interconnection boxes.

Description

technical field [0001] The invention relates to a fault location method and device for a power cable line cross interconnection box, belonging to the technical field of cable detection. Background technique [0002] With the increase of the operating life of the power cable lines in the urban power grid, the phenomenon of damage or failure of the cross-connection box of the power cable line tends to be normal. The cross-connection grounding method has too much sheath circulation, which is likely to cause excessive circulation of the cable sheath and aging of the sheath. , The transmission capacity of the cable is reduced, which has a huge impact on the operation of the cable line and seriously affects the safe operation of the cable. Therefore, in order to prevent the expansion of the hidden danger range of the power cable cross-connection box, reduce the occurrence of line accidents and power outages, and ensure the safe and reliable power supply of the power grid to the gr...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088Y04S10/52
Inventor 曹京荥陈杰陶风波刘建军刘洋谭笑胡丽斌李陈莹方春华郭凯歌丁璨普子恒吴田黎鹏
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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