A circuit breaker failure protection method for a substation

Abstract

The invention designs a protection method when a circuit breaker of a substation fails, and in particular relates to a protection method when a circuit breaker on the 220KV side of a main transformer of a 500KV substation fails. Specifically invented a protection method that starts the non-electricity protection circuit of the main transformer by increasing the failure protection action node of the high-voltage side circuit breaker of the main transformer due to bus failure, and trips the three-side circuit breaker of the main transformer by the non-electricity protection outlet of the main transformer after a delay , the protection method realizes rapid removal of faults, reduces the damage to the main transformer, and reduces the load loss.

Description

Technical field: [0001] The invention designs a protection method when a circuit breaker of a substation fails, and in particular relates to a protection method when a circuit breaker on the 220KV side of a main transformer of a 500KV substation fails. Background technique: [0002] The continuous development and safe and stable operation of the power system have brought huge impetus and benefits to the national economy and social development. At present, the 500kV power transmission and transformation network has replaced the 220kV power transmission and transformation network as the backbone network. high. [0003] The 500KV main transformer is the core of the entire 500KV substation, which puts forward higher requirements for the configuration of the main transformer protection. In high-voltage and extra-high-voltage power grids, circuit breaker failure protection is widely used as a near-backup protection method. Its purpose is to quickly and selectively remove the fau...

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Problems solved by technology

The disadvantage of this protection method is that the protection cost of the 220KV busbar is high, and it is very troublesome to replace it. The cost of the substation is high, which is not conducive to daily maintenance and replacement; moreover, this protection method does not have the function of starting failure and tripping the three sides of the main transformer. Only relying on the failure protection action to cut off the bus tie switch and the outlet switch connected to the same bus, the fault point cannot be effectively isolated, and the other operating bus can still inject short-circuit current into the fault point through another main transformer and 220kV bus tie switch, causing The two main transformers are damaged by the fault current for a long time, so measures must be taken to prevent

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