Method for operating an electronic overcurrent trip of a power circuit breaker
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United States of America Patent
Stats
-
May 6, 2003
Grant Date -
Oct 31, 2002
app pub date -
Dec 4, 2001
filing date -
Jun 4, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In power circuit breakers including a current transformer with a current detection coil without any iron and including an integration circuit connected downstream from the current detection coil, the unavoidable time constant of the integration circuit can lead to spurious trappings. This is avoided by a method in which the instantaneous values of the current are detected and stored at defined periodic intervals. The stored measured values are compared on the basis of polarity and magnitude. If it is found that the stored values have the same polarity and fall monotonally, it is assumed that the DC element is originating from the integrator and a tripping inhibit signal is set in the electronic release of the power circuit breaker.
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