Method and system for judging ground faults of medium and high voltage overhead transmission lines

A technology for overhead transmission lines and ground faults, applied in fault locations, information technology support systems, etc., can solve problems such as being susceptible to interference, increasing costs, and complex engineering procedures, to improve accuracy, facilitate power dispatch management, and facilitate collection. and processing effects

CN102590702AInactive Publication Date: 2012-07-18SHENZHEN CLOU ELECTRONICS
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2012-07-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method and a system for judging ground faults of medium and high voltage overhead transmission lines. The system comprises a line fault indicator with an iron core. The line fault indicator is connected with a feeder terminal unit (FTU) which is connected with a primary station. The method for judging the ground faults includes that (1) if direct current voltage value is lowered to a set value, ground faults occur, the line fault indicator gives an alarm to the FTU through wireless signals, and the FTU sends alarm signals to the primary station through general packet radio service (GPRS) or code division multiple access (CDMA); and (2) if the direct current voltage value is not lowered to the set value, the ground faults do not occur, and the line fault indicator sends no alarm. The system and the method can detect variation conditions of the medium and high voltage overhead transmission lines in real time. By detecting voltage variation and matching with line current variation, the system and the method can judge the ground faults accurately, send the alarm to the primary station through a remote transmission device, are convenient in electric power dispatching management, find the faults timely, isolate the faults, and solve the faults.
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Description

technical field

[0001] The invention relates to a judgment method and a judgment system for a grounding fault of a medium-high voltage overhead transmission line. Background technique

[0002] In power distribution management, once a ground fault occurs in a line, it may not only cause very serious accidents, such as: voltage rise and breakdown of connected lines, sudden change of fault phase current, pedestrian electric shock, etc., but also greatly reduce the quality of power supply. At the same time, because the ground fault conditions are changeable, such as: direct grounding, indirect grounding, arc grounding, etc., the accuracy of grounding fault judgment is not high.

[0003] In the past, a fault indicator device was installed on the line. When the line fails, the device can turn over and indicate an alarm. The device can only judge the ground fault according to the short-term inrush current of the line. However, in actual field use, the effect is poor, and gro...

Examples

Embodiment Construction

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] Such as figure 1 As shown, the system for judging the grounding fault of the medium and high voltage overhead transmission line includes a line fault indicator 1 with an iron core installed on the medium and high voltage overhead transmission line. CDMA connection master station 2.

[0018] Such as figure 1 As shown, A, B, C represent the bus, A 1 , B 1 、C 1 Indicates the first way out, A 2 , B 2 、C 2 Indicates the second outgoing line, the line fault indicator 1 in A 1 , B 1 、C 1 、A 2 , B 2 、C 2 Both are installed.

[0019] Medium and high voltage overhead transmission lines, namely, A, B, C busbars, A 1 , B 1 、C 1 First way out, A 2 , B 2 、C 2 There is an alternating current on the second outgoing line, so that on the A, B, and C buses, A 1 , B 1 、C 1 First way out, A 2 , B 2 、C 2 There is an alterna...