Fault current protection switch

Details Fault current protection switch Fault current protection switch

1977-01-21

1979-01-16

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 45, 361 46, H02H 328

Patent

active

041352220

ABSTRACT:
A fault current protection switch detects fault currents from conductors of a supply means to ground. The system uses at least one difference transformer connected to the conductors of the supply mains. An oscillation generator circuit is connected to the difference transformer through feedback windings. The oscillation generator circuit checks the magnetization of a core of the difference transformer, and, in the event of a change in the transforming properties of the core due to "mis" magnetization caused by a fault current, the oscillation generator circuit triggers a control and switching member connected in the supply mains to disconnect the same.

REFERENCES:
patent: 2984779 (1961-05-01), Klees
patent: 3671809 (1972-06-01), Ryan et al.
patent: 3742306 (1973-06-01), Cohen et al.

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