220kv Inner Bridge Wiring Substation Breaker Failure Protection Relay Protection Method

Abstract

The invention discloses a relay protection method for circuit breaker failure protection of a 220kV inner bridge connection substation, which is suitable for a 220kV inner bridge connection mode substation. The control process of circuit breaker 2DL failure; 3. The control process of 220kV inner bridge circuit breaker failure. After judging the failure of the line circuit breaker or the inner bridge circuit breaker in the 220kV transformer, the adjacent circuit breaker of the failed circuit breaker will be tripped after a delay. The criterion is simple and practical, and the relay protection function of the failure of the 220kV inner bridge circuit breaker is realized . When the 220kV line circuit breaker on the local side fails, the remote tripping function of the optical fiber current differential protection of the 220kV line is used to remotely trip the circuit breaker on the opposite side.

Description

technical field [0001] The invention relates to a relay protection method for circuit breaker failure protection of a 220kV inner bridge connection substation, belonging to the technical field of power transmission and distribution network control. Background technique [0002] According to the requirements of GB / T 14285-2006 "Technical Regulations for Relay Protection and Safety Automatic Devices" and State Grid Equipment [2018] No. 979 "State Grid Co., Ltd. on Printing and Distributing Eighteen Major Grid Anti-Accident Measures", the voltage level of 220kV and above The transformer shall be equipped with circuit breaker failure protection. However, the 220kV line circuit breakers and 220kV inner bridge circuit breakers of the 220kV inner bridge substation in actual operation are not equipped with circuit breaker failure protection, and the relevant national standards and regulations do not provide specific implementation plans, nor do they have corresponding typical design...

AI Technical Summary

Problems solved by technology

However, the 220kV line circuit breaker and the 220kV inner bridge circuit breaker of the 220kV inner bridge substation in actual operation are not equipped with circuit breaker failure protection. The relevant national standards and regulations have not given specific implementation plans, nor have corresponding typical design plans. When the 220kV transformer differential protection and backup protection action trips the 220kV line circuit breaker and 220kV inner bridge circuit breaker or the 220kV line protection action trips the 220kV line circuit breaker, if the above circuit breaker fails, the fault point needs to be protected by the backup of the line protection of the power supply side substation Segment action removal, fault removal takes a long time, endangering the safe and stable operation of power transmission and transformation equipment and power grid

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