Protection starting auxiliary method for pilot current differential protection

A technology of protection starting and current differential, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as protection refusal to operate, achieve the elimination of refusal to operate, strong sensitivity and quick action, and enhance sensitivity and reliability Effect

Active Publication Date: 2017-11-03
积成软件有限公司
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  • Abstract
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Problems solved by technology

[0009] Purpose of the invention: In view of the problem that one side of the existing high-voltage line longitudinal current differential protection may refuse to operate when a high-impedance grounding fault occurs, the present invention provides a protection start-up auxiliary method for the longitudinal current differential protection, which can ensure Reliable fault removal by differential protection in case of high-resistance grounding faults in the high-voltage line of power system

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  • Protection starting auxiliary method for pilot current differential protection
  • Protection starting auxiliary method for pilot current differential protection
  • Protection starting auxiliary method for pilot current differential protection

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Embodiment Construction

[0036] Below in conjunction with embodiment the present invention will be further described.

[0037] Such as image 3 As shown, the longitudinal current differential protection devices on both sides of the line include power supply module DC, main processor CPU1, slave processor CPU2, AC sampling module AC, DC digital input module DI and digital output module DO; the AC sampling module AC provides AC analog signals for the main processor CPU1 and the slave processor CPU2; the DC digital input module DI provides DC digital signals for the two CPUs; the main processor CPU1 and the slave processor CPU2 respectively Collect the AC analog signal and the DC switch signal, and then judge the protection startup logic and protection action exit logic based on the collected signals, and send the judgment results to the switch output module DO and the switch output module respectively. DO responds according to the combined results of the protection start logic and protection action exi...

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Abstract

The invention discloses a protection starting auxiliary method for pilot current differential protection. A judgment condition is added on the basis of an existing current differential protection criterion condition when a high-resistance fault occurs, a current auxiliary starting criterion condition is further added, the influence of a PT broken line on a voltage auxiliary starting criterion and the influence of a CT broken line on a current auxiliary starting criterion are comprehensively considered, the refuse operation of a traditional high-resistance auxiliary starting component caused by insensitivity of voltage characteristic quantity is eliminated, higher reliability is achieved, and the fault can be enabled to be reliably removed by differential protection when a high-resistance grounding fault occurs in a high-voltage circuit of a power system.

Description

technical field [0001] The invention belongs to the technical field of power system automation, and in particular relates to a protection start-up auxiliary method for a longitudinal current differential protection. Background technique [0002] With the rapid development of my country's power industry, relay protection has become an important part of the power system and plays a vital role in the safe operation of the power system. Due to the high voltage level, long transmission distance, and high transmission power of high-voltage transmission lines, fast, sensitive, and reliable removal of faults on the line is of great significance to maintaining the stable operation of the power grid. Due to the advantages of fast action speed, high sensitivity, simplicity and reliability, current differential protection has gradually replaced longitudinal distance protection in high-voltage line protection and has become the first choice for line longitudinal protection. [0003] As ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/26H02H7/261
Inventor 李明石文国朱建红马洋洋饶剑波
Owner 积成软件有限公司
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