A method of preventing circuit breaker failure protection from malfunctioning based on current waveform identification
A failure protection and current waveform technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as unfavorable dynamic stability characteristics of power systems, achieve the effects of shortening inherent action delay, good application prospects, and maintaining dynamic stability
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[0033] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0034] Such as figure 1 As shown, the schematic diagram of the CT primary current and secondary current when the circuit breaker is closed, in order to satisfy the magnetic potential relationship, the primary alternating current enters from the CT polarity end, and the secondary induced current exits from the CT polarity end. The dotted line indicates the primary current. The principal flux, current and flux satisfy the right-hand spiral theorem.
[0035] Such as figure 2 As shown, when the circuit breaker trips, the current on the primary side of the CT is 0. Since the magnetic flux in the iron core cannot change suddenly, the secondary current will maintain the size before the circuit break...
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