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Method and system for shortening action delay of in-situ failure protection

A failure protection and action technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as long delay in failure protection action

Active Publication Date: 2019-06-14
NARI TECH CO LTD +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the line protection sending end receives the input from the failure protection action of the adjacent device, it requires the remote tripping input and the remote transmission input to be confirmed after a delay of 20ms before being sent to the opposite line protection through the fiber channel, and the failure protection action is delayed long

Method used

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  • Method and system for shortening action delay of in-situ failure protection
  • Method and system for shortening action delay of in-situ failure protection
  • Method and system for shortening action delay of in-situ failure protection

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Embodiment 1

[0072]Embodiment 1: In this embodiment, the action sequence and delay distribution of the present invention are analyzed by taking the occurrence of a fault on the bus on the local side as time 0. After 30ms after a fault occurs on the busbar, the busbar protection acts and exits to start the failure protection of the circuit breaker protection. The failure protection action time of circuit breaker protection is set to 90ms. 90ms is considered based on the fact that the main protection operates in 30ms and the switch fails to trip in 60ms. That is, the circuit breaker protection will judge that the circuit breaker has failed to trip after 90ms after receiving the protection trip switch, and the circuit breaker failure protection will be activated. In the on-site circuit breaker protection and line protection designed in the present invention, the switch signal between the devices interacts through the on-site protection special network. From the failure of the busbar to the o...

Embodiment 2

[0078] Embodiment 2: In this embodiment, the long-jump passing fault criterion time and the long-distance jump not passing the fault criterion time are set to 90ms and cannot be adjusted: if a fault occurs on the opposite side, the main protection switch fails to trip in 60ms, and the failure protection returns in 30ms design. For the side protection that receives the remote trip start command, if any remote trip local criterion meets the action condition and the timing exceeds 90ms, it can be determined that the switch on the opposite side of the line has failed.

[0079] After the line protection at the local end receives the failure signal sent by the circuit breaker protection through the local protection network, the failure protection action signal is sent to the opposite end in the form of "remote transmission 1" through the longitudinal fiber channel. If any of the remote trip local criteria of the peer line protection satisfies the action condition and the timing of 9...

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Abstract

The invention provides a method and system for shortening action delay of in-situ failure protection. Based on the cooperation of circuit breaker protection and line protection, the interaction of failure action signals of protection devices in a current station is realized through a local protection network; the rapid failure isolation of switch failures occurring on a current side of a power transmission line is realized by side switch failure shunt tripping for breaker protection and a failure protection optimizing algorithm; and rapid switch-off between the power transmission line and an end switch is realized by a rapid remote trip flow for the circuit protection and increasing in situ remote trip criterion of a phase spacing and a grounding distance. Through the whole set of technical scheme, the time for starting the opposite-side switch of the remote trip circuit by the side main protection action-failure protection action can be shortened within 200 milliseconds in order to guarantee no direct-current phase-switching failure, lower the impaction of the alternative-current system failure to the direct-current system, and improve the safety stability of an alternating / direct-current interconnection system.

Description

technical field [0001] The invention belongs to the technical field of power system failure protection, and in particular relates to a method for optimizing the action flow of in-situ failure protection, shortening the time delay of protection action, and reducing the time for isolation and failure of in-situ protection by coordinating circuit breaker protection and line protection. Background technique [0002] The 500kV circuit breaker failure protection of the domestic AC power grid is configured according to the circuit breaker switch, that is, the circuit breaker protection device is used to realize the failure protection function. But for the failure of the system failure switch, according to the existing setting regulations, the circuit breaker failure protection action time is about 200-250ms. After the failure protection action, the opposite side switch is far-jumped through the line protection, and the side switch installed on the same bus in adjacent strings is ju...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 吴通华陈国洲姚刚郑玉平王小红裘愉涛汪冬辉洪丰郑小江余洪江源侯小凡
Owner NARI TECH CO LTD
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