Transformer differential protection difference stream and differential protection instantaneous TA abnormal state identification protecting method

Abstract

The invention is a method of identifying and protecting differential protective difference current and differential protective transient TA abnormal state of a transformer. The differential abnormal alarming adopts ratio brake principle, the difference current abnormal alarming threshold value varies with the variation of load current of the transformer, when a phase difference current meets a condition, send out an abnormal alarming signal in no need of locking differential protection, the differential current initial value should be adjusted by avoiding the exciting current of the transformer, generally 0.03Ie, where Ie is rate current of the transformer, combine industrial frequency variation quantity voltage opening component and the current quantity, the distinguishing principle of differential protective loop transient TA breakage and short-circuit is allowable type, when differential protection starts and then meets conditions, consider it is a failure condition to open differential protection, and otherwise consider it is a start of differential protection caused by differential loop TA abnormality.

Description

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AI Technical Summary

Benefits of technology

In this patented technology, there has been developed an improved way to detect if any electrical faults occur during operation of electric equipment such as motors used in industrial processes. By comparing different phases' voltages from both ends of each phase line, we have found that some lines will be more likely to break down due to overvoltage conditions than others. These technical improvements make sure safe operations continue without interruption caused by these broken wires.

Problems solved by technology

This patented technical solution described in this patents describes different ways to distinguish between normal faulty signals caused by overheating or insulation failure in a power system's protective device called a differential relay. However these techniques suffer from various limitations such as lack accuracy due to factors like temperature changes or voltage fluctuations.

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