Electronic trip device comprising a test device
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United States of America Patent
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-
Aug 22, 1995
Grant Date -
N/A
app pub date -
Dec 15, 1993
filing date -
Dec 28, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The terminals of a test circuit are directly connected to outputs of the transformer secondary windings and to the input of the rectifying circuit so that the test current checks operation of the trip device. A sign detection circuit supplies a processing circuit with the values of the polarities of the rectified currents. The processing circuit comprises means for determining the presence of a test current when the sign of the rectified current comprising the test current remains continuously in the same polarity. A differentiation of the continuous polarity, positive or negative, of the test current enables testing to be carried out with or without earth protection tripping.
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