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

Abstract

The invention relates to a reclosing line selection acceleration discrimination method based on TVs on both sides. Firstly, the reclosing device is used to sample the line voltage of the two lines corresponding to the intermediate circuit breaker; then the memory voltage of the two lines is calculated; Threshold value, the line on this side is considered to be a faulty line, and the corresponding line is accelerated. Prevents acceleration of non-fault lines. Through the verification of the dynamic model test, using the above method, the reclosing device corresponding to the intermediate circuit breaker can successfully identify the faulty line in the two lines. Prevent reclosing to accelerate the unfaulted line when a fault occurs, avoid the malfunction of the line protection device in the acceleration state caused by the closing surge current, and improve the operation stability of the power 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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