Line protection control method and microcomputer protection device

Abstract

The embodiments of the present application provide a line protection control method and a microcomputer protection device, the method is applied to the microcomputer protection device, and the method is used to control a circuit breaker in a power supply line, and the power supply line includes a circuit breaker and a plurality of distribution transformers, The circuit breaker is located in the primary side lines of a plurality of distribution transformers; in one embodiment, the method includes: when the circuit breaker is in a closed state, monitoring the current of the power supply line; when it is detected that the current of the power supply line reaches a set value When it is detected that the voltage on the power supply line meets the tripping protection condition, when it is detected that the current of the power supply line reaches the set quick-break protection setting value and the voltage on the power supply line meets the tripping protection condition, determine whether the power supply line meets the tripping protection condition. A line fault occurs, and a protection trip command is sent to the circuit breaker, so that the circuit breaker performs a trip operation according to the protection trip command. In this way, the success rate of power transmission and the effective protection of the line can be taken into account.

Description

technical field [0001] The present application relates to the technical field of power transformation and distribution, and in particular, to a line protection control method and a microcomputer protection device. Background technique [0002] In some power supply scenarios, for some early-built enterprise power supply stations, the power supply lines are complicated. One circuit breaker controls multiple power distribution transformers, and some circuit breakers control as many as 20 distribution transformers. The capacity of a transformer is roughly 100-2000kVA, and the capacity of each transformer may be the same or different. The total capacity of the transformers on the supply line where one circuit breaker is located adds up to about 13MVA. [0003] The power supply line is 3 kilometers long, and many overhead lines are used, which is prone to line failures. In the event of a short-circuit fault, the feeder circuit breaker will trip for protection such as quick-break...

AI Technical Summary

Problems solved by technology

Because there are a large number of feeder transformers on the power supply line, taking a circuit breaker connected to 20 transformers as an example, at the moment when the circuit breaker is switched on, the excitation inrush current generated by 20 transformers receiving power at the same time is large, and exceeds the fixed value of the quick-break protection, so it is related to the circuit breaker. The protection device associated with the transformer will draw a conclusion that the quick-break trip protection should be performed at this time according to the fact that the current has exceeded the fixed value of the quick-break protection, and control the circuit breaker to trip, which is also an important reason for the relay protection action of the transformer. A hidden danger that has not been fundamentally resolved for a long time

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