Power distribution network line protection system and method based on circuit breaker

Abstract

The invention discloses a power distribution network line protection system and method based on a circuit breaker. The system comprises a three-level protection module and a fault judging and processing module, and the three-level protection module comprises an outgoing line circuit breaker protection module, a sectional circuit breaker protection module and a branch circuit breaker protection module; each level of protection module is configured with overcurrent protection; and the fault judging and processing module judges fault positions and fault types, and controls all levels of protection modules to act according to different fault positions and different fault types. According to the invention, the protection of the outgoing circuit breaker, the sectional circuit breaker and the branch circuit breaker of the power distribution network is divided into three levels, and different protection constant values, delay setting modes and reclosing strategies are combined while the overcurrent protection of each level is configured, so that the outgoing circuit breaker can be ensured to quickly remove faults, the faults can be isolated sectionally, and the power failure range of the faults is reduced as much as possible.

Description

technical field [0001] The invention relates to the technical field of distribution network line protection, in particular to a circuit breaker-based distribution network line protection system and method. Background technique [0002] In the distribution network system, in order to improve the fault removal ability and speed of the system, the load switch is gradually replaced by the circuit breaker at the section and branch, and each distribution line includes multiple section circuit breakers and branches along the line. circuit breaker, the system is more complex. [0003] Under the condition that the traditional overcurrent protection scheme cannot cooperate, the distribution network protection scheme often only emphasizes on ensuring the safety of the system itself, and does not fully consider how to protect users from the influence of faults. Based on this, the circuit breaker-based distribution network line protection configuration is usually simplified in actual en...

AI Technical Summary

Problems solved by technology

Although this can reduce the power outage range when a branch fault occurs, it makes the outgoing line circuit breaker take too long to cut off a large current fault, causing a long-term slump in the bus voltage of the substation, threatening the safety of the system and the normal power supply of the non-faulty line of the same bus.

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