Detection of transformer high side fuse operations in a power tr

Details Detection of transformer high side fuse operations in a power tr Detection of transformer high side fuse operations in a power tr

1995-10-20

1997-02-11

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361 86, 361 85, H02H 704

Patent

active

056027079

ABSTRACT:
Voltage comparisons are made for each of the phase-phase voltages on a low side of a distribution transformer in a power system against a threshold, approximately 0.7 nominal secondary voltage, which is less than the value of at least one phase-phase voltage when only one high side fuse has operated. High outputs result when the phase-phase voltages exceed the threshold. At the same time voltage comparisons are made of each of the phase-phase low side voltages and a second threshold, approximately 0.2 nominal secondary voltage, which is substantially less than the first threshold. High outputs result when the voltages are below the threshold. A circuit output is provided which can be used to trip a low side circuit breaker when at least one output of the first comparisons is high and at least one output of the second comparisons is high.

REFERENCES:
patent: 3584259 (1971-06-01), Traub et al.
patent: 4357644 (1982-11-01), Schmidt
patent: 4366474 (1982-12-01), Loewenstein

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