A station-domain backup protection method that can be used to simplify the local backup protection of transformers

Abstract

The invention relates to a station domain backup protection method which can be used for simplifying the on-site backup protection of transformers. The existing transformer backup protection has difficulties such as complex configuration, difficulty in setting and coordination, long action delay, and difficulty in ensuring sensitivity. The invention configures the distance protection of the forward and reverse direction action characteristics for the circuit breakers on each side of the transformer, the impedance setting value is set according to the sensitivity requirements for realizing the respective functions, and the selectivity is achieved by a fixed time setting value. Then, a fault-tolerant station domain backup protection criterion is constructed according to the switch quantity information within the scope of the station, so as to realize the judgment of faulty components and the decision of circuit breaker tripping, and accelerate the fault removal in the station. The invention reduces the difficulty of setting the transformer on-site backup protection, and realizes the coordination and unity of the backup protection in action selectivity, quickness, sensitivity and reliability when the equipment in the station fails.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a station domain backup protection method that can be used to simplify the on-site backup protection of transformers. Background technique [0002] The structure and operation mode of the power grid are becoming more and more complex, and the setting value of the traditional transformer on-site backup protection is becoming more and more difficult to set. This is mainly because the traditional transformer local backup protection only obtains local fault information, and cannot quickly and accurately identify fault components in principle, and can only meet the selectivity and sensitivity requirements as much as possible through complex protection configuration and setting coordination. Following the conventional setting principles, the local backup protection of the transformer is equipped with multi-stage and multi-delay overcurrent protection (including with c...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a station domain backup protection method that can be used to simplify the on-site backup protection of transformers in view of technical deficiencies such as complex configuration of transformer traditional backup protection, difficulty in setting and coordination, long action delay, and difficulty in ensuring sensitivity.

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