Fault sensing system for a transformer network

Details Fault sensing system for a transformer network Fault sensing system for a transformer network

1985-07-26

1987-06-23

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361 57, 361104, 200144B, H02H 704

Patent

active

046757716

ABSTRACT:
A fault sensing system for protecting a transformer, the system including a partial range current limiting fuse connected in series in the primary circuit for the network transformer, a normally open vacuum switch connected to the primary circuit and shunted to ground between the current limiting fuse and the transformer, a solenoid actuated assembly for closing the vacuum switch and a fault sensing circuit assembly operatively connected to energize the solenoid assembly, the fault sensing circuit being normally de-energized and including a current transformer mounted on the primary circuit and a low voltage fuse element connected across the current transformer, the fault sensing circuit assembly being energized on operation of the low voltage fuse element to momentarily energize the solenoid.

REFERENCES:
patent: 3418308 (1964-09-01), Specht
patent: 3471814 (1969-10-01), Burdett
patent: 4174529 (1979-11-01), Hamann

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