Device for detecting excess-current in a direct-current generato

Details Device for detecting excess-current in a direct-current generato Device for detecting excess-current in a direct-current generato

1987-05-26

1988-01-26

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361100, 361 87, H02H 308

Patent

active

047220244

ABSTRACT:
The apparatus relates to an excess-current monitoring device in a direct-current generator having a controlled rectifier, and is particularly useful for electro-chemical machining. A reference signal is generated by a signal generator in accordance with the voltage drive of the rectifier and the mean current supplied to the load. The reference signal is supplied to a comparator which supplies a current-switch-off-signal when the value of the reference signal as compared to the instantaneous load current indicates excess mean load current. This enables optimum machining.

REFERENCES:
patent: 3743887 (1973-07-01), Keough et al.
patent: 3895263 (1975-07-01), Clark
patent: 4127895 (1978-11-01), Krueger
patent: 4297741 (1981-10-01), Howell
patent: 4309735 (1982-01-01), Morris
patent: 4346423 (1982-08-01), Matthes et al.

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