Method for accelerating discrimination reclosing route selection based on two sides TV

Abstract

The invention relates to a reclosing route selection acceleration discrimination method which is based on the TV at two sides. Circuit voltage is first sampled for two circuits corresponding to a central circuit breaker by the reclosing device, and the memory voltages of the two circuits are calculated; if the memory voltage is lower than the valve value, the circuit is malfunctioned, and corresponding circuit is accelerated. Non-malfunctioned circuit is avoided to be accelerated. By dynamic test certification and the method, the reclosing device corresponding to the central circuit breaker can successfully discriminate the malfunction circuit between two circuits, prevents a reclosing from accelerating the circuit which has no malfunction when malfunction occurs, avoids the misoperation of the circuit protection device in acceleration state which is caused by closing impulse current, and improves the operation stability of electric system.

Description

technical field [0001] The invention belongs to the technical field of power system automation, and relates to a reclosing line selection acceleration discrimination method based on TVs on both sides. Background technique [0002] The operation experience of the power system shows that most of the faults of overhead lines are instantaneous, and the permanent faults are generally less than 10%. Therefore, after the fault is removed by the relay protection action, the arc will be automatically extinguished, and the insulation at the short circuit can be automatically restored in most cases. Therefore, automatically reclosing the circuit breaker not only improves the reliability of power supply and reduces the power failure loss, but also improves the transient stability level of the power system and increases the power transmission capacity of the high-voltage line. If reclosing occurs in a permanent fault, the protection device will act to open the circuit breaker without ti...

AI Technical Summary

Problems solved by technology

However, most of the 3 / 2 wiring forms use single-phase reclosing, without checking the synchronization and no-voltage criteria

The existing reclosing acceleration logic is that after the intermediate circuit breaker recloses, the two lines on the string will be accelerated at the same time. For non-faulty lines, it may cause malfunction due to the closing surge current, which is not conducive to the stable operation of the power system.

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