Rapid pressure rise circuit

Details Rapid pressure rise circuit Rapid pressure rise circuit

1988-01-21

1989-04-18

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361110, 307118, 340626, H02H 704

Patent

active

048232246

ABSTRACT:
An electronic relay control circuit is provided for liquid cooled electric power transformers. The control circuit senses the rate of change of internal tank pressure and operates its relays in response to a sudden pressure increase. Relay control connections are provided for operating transformer trip and annunciator circuits. The relay response is field adjustable.

REFERENCES:
patent: 3914667 (1975-10-01), Waldron
patent: 4001644 (1977-01-01), Lingenfelter et al.
patent: 4218216 (1980-08-01), Narbus
patent: 4297241 (1981-10-01), Howell
patent: 4297738 (1981-10-01), Lee
patent: 4376243 (1983-03-01), Renn et al.
patent: 4441056 (1984-04-01), Siglock
patent: 4644439 (1987-02-01), Taarning
patent: 4654806 (1987-03-01), Poyser et al.

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