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Method and system for locating single-phase ground fault point on valve side

A single-phase-to-ground fault, valve-side technology, applied in the fault location, information technology support system, etc., can solve the problems of inconvenient transmission system monitoring and maintenance, and no method for locating the fault point.

Active Publication Date: 2018-07-27
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the existing research on the ground fault on the valve side of the converter has not provided a method for locating the fault point. When a fault occurs, it is not convenient for the monitoring and maintenance of the transmission system

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  • Method and system for locating single-phase ground fault point on valve side
  • Method and system for locating single-phase ground fault point on valve side
  • Method and system for locating single-phase ground fault point on valve side

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Embodiment Construction

[0058] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0059] The embodiments provided by the present invention include an embodiment of a method for locating a single-phase ground fault point on the converter valve side of the rectifier side, an embodiment of a method for locating a single-phase ground fault point on the converter valve side of the inverter side; it also includes a co...

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Abstract

The invention relates to a method and system for localizing a single-phase earth fault point of a valve side. The method for localizing a single-phase earth fault point of a converter valve side of a rectification side comprises: whether a Y-bridge short-circuit protection unit and a D-bridge short-circuit protection unit at a converter valve side of a rectification side take protection action is detected; if so, the current single-phase earth fault point of the rectification side is determined to be located at a Y bridge valve group of the converter valve side. With the method and system, localization of a single-phase earth fault point of a converter valve side of a rectification side and an inversion side can be realized.

Description

technical field [0001] The invention relates to the technical field of direct current transmission engineering, in particular to a method and a system for locating a single-phase ground fault point on a valve side. Background technique [0002] The converter transformer of the DC transmission project is located outside the valve hall, and is connected to the converter valve through the DC wall bushing. When the DC is running normally, the converter valve side bushing bears both AC voltage and DC voltage, and there are large voltage harmonics. Weight, the bushing manufacturing process requirements are relatively high, when the wall bushing due to seal failure, damp discharge or flashover fault occurs, a single-phase ground fault on the converter valve side may occur, resulting in DC blocking or equipment damage. There have been many single-phase ground faults on the valve side of the converter transformer in the DC project, causing serious consequences. [0003] At present, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 钟澎李明黎小林黄莹刘涛黄伟煌李婧靓寻斌斌田凌
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD