Electrical apparatus for differential protection with a test circuit
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United States of America Patent
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-
Nov 2, 1999
Grant Date -
N/A
app pub date -
Sep 11, 1997
filing date -
Mar 16, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A trip device comprising a differential current detection transformer, a trip relay of a breaking mechanism of the circuit breaker and a test circuit for checking the operation of the trip device. The relay comprises a fixed yoke bearing a coil and a blade that is mobile with respect to the yoke. During normal operation of the trip device, the blade is held magnetically in the position pressing against the yoke and when a differential current occurs, the blade actuates the breaking mechanism. The test circuit generates a vibration of the blade, without causing tripping of the mechanism, in order to check its ability to disengage from the fixed yoke. Advantageously, this vibration is obtained by application of a voltage in the form of pulses to the terminals of the coil.
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