Circuit breaker failure protection relay protection method for 220kV inner bridge wiring transformer substation.

Abstract

The invention discloses a circuit breaker failure protection relay protection method for a 220kV inner bridge wiring transformer substation. The method is suitable for a transformer substation in a 220kV inner bridge wiring mode and comprises the following steps of: 1, a control process of failure of a breaker 1DL1 of a 220kV line L1; 2, a control process of failure of a breaker 2DL of 220kV line L2; and 3, a control process of failure of a 220kV inner bridge circuit breaker. After the failure of the circuit breaker or the inner bridge circuit breaker of the 220kV transformer is judged, the adjacent circuit breaker of the failure circuit breaker is tripped off after time 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 side fails, the circuit breaker on the opposite side is remotely tripped through the remote tripping function of 220kV line optical fiber current differential protection, new equipment does not need to be added, and the method is good in economical efficiency and high in realizability.

Description

technical field [0001] The invention relates to a relay protection method for failure protection of a circuit breaker in a 220kV inner bridge connection substation, and belongs to the technical field of electric 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 Corporation of China on Printing and Distributing Eighteen Major Power Grid Anti-Accident Measures", the voltage level of 220kV and above The transformer should be equipped with circuit breaker failure protection. 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 corr...

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

Images