Current protection control method and device

Abstract

A current protection control method is provided, the steps are as following: while suddenly adding power, time delay is added; after stable operating, calculating a current affective valve more than the setting value; if the current affective valve is not more than the setting value, re-processing the sampling; it the effective value is more than the setting value, the current in the line is judged as flowing or over-flowing / short circuit; it current is flowing, processing re-sampling; if the current is over-flowing / short circuit processing protection action. A current protection control device, the structure is that: a power source module outputs connecting singlechip power source input; A, C phase current mutual inductors respectively outputs the power quantity signal collecting module input, and singlechip collecting signal input after the signal collecting module output end is A / D converted; switch quantity input module connects the singlechip; the singlechip output connects input of the switch quantity output module; the output module controls a tripping coil driven module; the power source of the tripping coil driven module is connected the output of the A, C phase current mutual inductors; the driven module output module is connected to the external tripping coil driven module.

Description

technical field [0001] The invention belongs to the field of microcomputer relay protection, and in particular relates to a 10kV line overcurrent and short circuit three-stage current protection and a current protection control method and device for avoiding line surge. Background technique [0002] The 10kV power distribution system is part of the power system. Whether it can run safely, stably, and reliably is not only directly related to the unimpeded power consumption of enterprises, but also involves the normal operation of the power system. Therefore, when a line in the power distribution network is in an abnormal operating state, the line The circuit breaker should be able to cut it off in time and reliably to prevent the further occurrence and expansion of the fault. In addition, when there is no-load closing of the transformer in the line, there will be an instantaneous inrush current on the line. Because it is not faulty, the line circuit breaker does not need to...

AI Technical Summary

Problems solved by technology

There are certain defects in judging the over-current and short-circuit status of the line in this way, and the upper-level line circuit breaker may accidentally trip due to inrush current when the lower-level line suddenly closes.

Images