Substation area backup protection method used for simplifying transformer in-place backup protection

Abstract

The present invention relates to a substation area backup protection method used for simplifying transformer in-place backup protection. The conventional transformer backup protection has the difficulties of complex configuration, difficult setting and cooperation, long action delay, and poor sensitivity. The substation area backup protection method is characterized in that distance protection with forward/reverse direction acting characteristics can be configured for a breaker at each side of a transformer, impedance constant values are set according to sensitivity requirement achieving respective function, and selectivity is achieved through fixed time constant values; after that, a substation area backup protection criterion having fault tolerance is constructed according to switching quantity information within the range of the substation, so as to achieve judgment for fault components and decision for breaker tripping, thereby accelerating fault clearing within the substation. The substation area backup protection method reduces setting difficulty of transformer in-place backup protection, and achieves coordination and unification among action selectivity, quickness, sensitivity and reliability of backup protection when a fault occurs on substation equipment.

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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