Electronic trip device comprising a test device

Details Electronic trip device comprising a test device Electronic trip device comprising a test device

1993-12-15

1995-08-22

O'Shea, Sandra L.

Electricity: measuring and testing

Electromechanical switching device

Circuit breaker

361 87, G01R 3102

Patent

active

054443776

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.

REFERENCES:
patent: 4068275 (1978-01-01), Teel et al.
patent: 4105965 (1978-08-01), Russell
patent: 4761704 (1988-08-01), Fraisse et al.
patent: 4814712 (1989-03-01), Burton et al.
patent: 4851950 (1989-07-01), Ballada
patent: 4977513 (1990-12-01), La Palme
patent: 5086367 (1992-02-01), Ishii et al.

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