Method for loosening the contacts of a sticking relay as well as

Details Method for loosening the contacts of a sticking relay as well as Method for loosening the contacts of a sticking relay as well as

1988-06-10

1990-04-03

Jennings, Derek S.

Electrical transmission or interconnection systems

Switching systems

With operation facilitating feature

307129, 361170, 361203, H01H 4712

Patent

active

049143158

ABSTRACT:
A method for releasing the contacts of a sticking relay by sensing whether or not the relay contacts stick together in a closed condition and when the contacts stick together, applying an AC voltage on pulsating DC voltage to the winding of the relay coil. The mechanism for sensing the sticking relay contact condition is a comparator to compare the output load of the relay with the exciting control signal to energize the relay coil.

REFERENCES:
patent: 3958198 (1976-05-01), Minks
patent: 4254391 (1981-03-01), Gould
patent: 4645886 (1987-02-01), Williams
patent: 4769737 (1988-09-01), Ogita et al.

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