No-power-stoppage conversion circuit breaker set sequential control method for 30-degree angular phase difference power distribution lines

Abstract

The invention discloses a no-power-stoppage conversion circuit breaker set sequential control method for 30-degree angular phase difference power distribution lines. Through selecting a standby circuit breaker, a remedial measure on the condition of action rejection of a loop closing circuit breaker or a loop unlinking circuit breaker is realized. Through a method of sequentially controlling the circuit breakers, high definiteness is realized. The no-power-stoppage conversion circuit breaker set sequential control method is suitable for a 30-degree angular phase difference power distribution line loop-closing or loop unlinking occasion in high-speed communication.

Description

technical field [0001] The invention relates to a sequential control method for a power distribution line with a phase angle difference of 30 degrees to supply a circuit breaker group without power interruption, and belongs to the field of power grids. Background technique [0002] The distribution network of 110kV and below mainly realizes non-stop power supply transfer through the loop closure method, that is, when the distribution network is carrying out load transfer, equipment maintenance, and network reconstruction, the load is "heated" through the loop closure operation to reduce power outages time and improve power supply reliability. In some areas, the operation of closing and disassembling the power grid is very frequent, accounting for 48.1% of the daily operation items of dispatching. During the loop closing operation, the loop closing current generated by the voltage amplitude, phase angle, impedance and load difference on both sides of the loop closing point n...

AI Technical Summary

Problems solved by technology

[0013] The above operation sequence does not take into account the situation that the circuit breaker refuses to operate when closing and releasing the loop, and once the phenomenon of refusal to operate occurs, especially when the loop fails, the existing circulating current will start to affect the electrical mains in the loop. The equipment produces relatively serious thermal effects; if the ring is not released in time, the continuous thermal effect will affect or even destroy the insulation characteristics of the main electrical equipment, and the lighter ones will reduce the life of the main electrical equipment. If the thermal effect of the main equipment is seriously exceeded, it will cause electrical main equipment burnt down, causing massive power outages

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