Electronic trip device comprising an earth protection

Details Electronic trip device comprising an earth protection Electronic trip device comprising an earth protection

1993-09-24

1995-07-25

Hoff, Marc S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 45, 361 93, H02H 326

Patent

active

054367859

ABSTRACT:
An electronic trip device comprising, for each phase or neutral line, a rectifier bridge formed by four diodes which rectify the transformer current, a resistance for measuring the rectified current, and a circuit for detecting the sign or polarity of the measured current connected to one end of the transformer. A processing circuit calculates a value representative of the earth fault current by adding all the current values whose corresponding sign is positive and subtracting all the current values whose corresponding sign is negative. This current value is processed so as to bring about tripping when a threshold is exceeded for a preset time.

REFERENCES:
patent: 3697810 (1972-10-01), Wilson et al.
patent: 4899246 (1990-02-01), Tripodi

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