Voltage-unbalance detector for polyphase electrical systems

Details Voltage-unbalance detector for polyphase electrical systems Voltage-unbalance detector for polyphase electrical systems

1978-11-03

1982-08-24

Gellner, Michael L.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

361 86, 361 90, H01H 8314

Patent

active

043463070

ABSTRACT:
A detector for high-voltage, polyphase gear, having a fuse-switch combination in each phase and a switch operator, includes voltage sensors which provide first time-varying signals indicative of the magnitude and phase orientation of the phase-to-ground voltages on each phase within the gear at the load side of the fuses. The first signals are vectorially added to provide a second time-varying signal, the peak value of which varies as the magnitude and phase orientation of the phase-to-ground voltages of the phases. The second signal is compared to a reference; an error signal is generated when and as long as the phase-to-ground voltages vary beyond set limits. A timer responds to the error signal and provides a third signal a predetermined time after initiation of the error signal, but only if the error signal persists for such time. The third signal is used to cause the operator to open the switches.

REFERENCES:
patent: 2234235 (1941-03-01), Dubusc
patent: 2941121 (1960-06-01), Gladnick et al.
patent: 3636541 (1972-01-01), Genuit et al.
patent: 3727103 (1973-04-01), Finch et al.
patent: 3838314 (1974-09-01), Boothman et al.
patent: 4002976 (1977-01-01), Zulaski
patent: 4060843 (1977-11-01), Bost
patent: 4091433 (1978-05-01), Wilkinson

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