Performance of current transformers during transients

Details Performance of current transformers during transients Performance of current transformers during transients

H - Electricity

02

H

348/20

H02H 3/08 (2006.01)

Patent

CA 1058738

ABSTRACT OF THE DISCLOSURE A current transformer used in a power circuit for initi- ating operation of a circuit breaker has a resistor in series with the burden on its secondary. This resistor is shunted by a set of contacts which close or open with the main contacts of the breaker. These secondary con- tacts are closed when the main contacts are closed and are open only when the main contacts are open. Opening of the secondary contacts places the resistor in series with the burden; this causes repid decay of the flux in the core to the residual level, rapidly making the trans- former ready for further fault current when the main breaker contacts are reclosed. This arrangement will improve the transient performance of current transformers, but it is particularly effective with gapped core current trans- formers.

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