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Voltage type power distribution system single-phase grounding fault elimination method

A single-phase ground fault and power distribution system technology, applied in fault location, information technology support system, etc., can solve the problems of user economic loss, long power outage in ground fault area, small fault current, etc. The effect of processing efficiency and improving reliability

Active Publication Date: 2015-12-09
STATE GRID SHANDONG ELECTRIC POWER
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Problems solved by technology

[0002] In the existing technology, the known technology is that most of the 10kV distribution network is a neutral point indirect grounding system, and the fault current is small when a single-phase grounding fault occurs, so it is difficult to quickly confirm the fault point
When dealing with ground faults, the existing small current line selection device has a high accuracy rate, but the distribution automation system does not have the automatic processing function for single-phase ground faults. The control personnel command to restore the power supply in the non-fault area, resulting in a long power outage in the ground fault area, which brings huge economic losses to users

Method used

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Embodiment Construction

[0018] In order to clearly illustrate the technical features of the solution, the solution will be described below through a specific implementation mode combined with the accompanying drawings.

[0019] It can be seen from the drawings that in this scheme, the ground fault self-healing preset program is started according to the substation bus grounding alarm signal and the line selection result of the small current line selection device, and an alarm is issued to start the ground fault self-healing program.

[0020] 1) According to the result of the small current line selection device, the distribution automation system automatically and remotely pulls the outlet switch CB1 of the selected line, and starts the countdown of the ground fault T1 time limit. T1 can be 5s, 7s, 8s or the staff can adjust it as needed. If the grounding alarm signal disappears within the T1 time limit, it is confirmed that the fault point is located on the line, and the next step is automatically proc...

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Abstract

The invention provides a voltage type power distribution system single-phase grounding fault elimination method. The method comprises steps of firstly determining a grounding fault circuit; then further verifying whether this circuit breaks down or not; then detecting which section the grounding fault is in from an outgoing line switch of an outgoing end of a transformer substation; and then successively detecting section switches from the one near the outgoing line switch, thereby achieving single-phase grounding fault elimination and power supplying of the power distribution system.

Description

technical field [0001] The invention relates to a single-phase ground fault troubleshooting method of a voltage-type power distribution system, which can solve the problems of difficult location of single-phase ground faults in the current distribution network and long power outage time, improve the processing efficiency of single-phase ground faults in the distribution network, and reduce The work intensity of control personnel and line patrol personnel is improved, and the reliability of power supply of distribution network is improved. Background technique [0002] In the prior art, it is known that the 10kV distribution network is mostly an indirect neutral point grounding system, and the fault current is small during a single-phase grounding fault, making it difficult to quickly identify the fault point. When dealing with ground faults, the existing small current line selection device has a high accuracy rate, but the distribution automation system does not have the aut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 杨福林山董金国臧宏伟屈超顾世龙范永艳张兆笑王悦贾玉健
Owner STATE GRID SHANDONG ELECTRIC POWER
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