Relay protection method for eliminating dead zone fault of sectional circuit breaker and bus tie circuit breaker

Abstract

The invention discloses a relay protection method for eliminating dead zone faults of section circuit breakers and bus tie circuit breakers. Relay protection for double-bus wiring to eliminate section or bus tie circuit breaker dead zone faults. The present invention adopts the scheme of substation 110kV bus differential protection to eliminate the dead zone fault of the section or bus tie circuit breaker, and can correctly operate the bus differential protection to remove the fault when a section or bus tie dead zone fault occurs in various operating modes The section bus can ensure that the non-faulty bus can still continue to operate, which is conducive to the safe and stable operation of the power grid and improves the reliability of the power supply of the power grid. The logic of the present invention is simple and easy to implement. The scheme of the invention is applicable to the primary main wiring of 110kV single busbar in 110kV substation; the primary main wiring of 110kV double busbar in 220kV substation; and the primary main wiring of 110kV single busbar in 220kV substation.

Description

technical field [0001] The invention relates to a relay protection method for eliminating dead zone faults of section circuit breakers and bus tie circuit breakers, and belongs to the technical field of electric power transmission and distribution network control. Background technique [0002] In substations with single-bus section wiring or double-bus wiring, current transformers are usually only installed on one side of the section circuit breaker or bus-tie circuit breaker, which results in the existence of dead ends in the section circuit breaker or bus-tie circuit breaker. zone fault (fault between the section circuit breaker or bus tie circuit breaker and the current transformer of the section circuit breaker or bus tie circuit breaker). There is a dead zone fault in the section circuit breaker or bus tie circuit breaker, which will make it difficult to remove the fault. At present, the general method adopted for the dead zone fault of section circuit breaker or bus t...

AI Technical Summary

Problems solved by technology

[0002] In substations with single-bus section wiring or double-bus wiring, current transformers are usually only installed on one side of the section circuit breaker or bus-tie circuit breaker, which results in the existence of dead ends in the section circuit breaker or bus-tie circuit breaker. Zone fault (fault between section circuit breaker or bus tie circuit breaker and current transformer of section circuit breaker or bus tie circuit breaker)

There is a dead zone fault in the section circuit breaker or bus tie circuit breaker, which will make it difficult to remove the fault

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