Programmed overexcitation protective relay and method of operati

Details Programmed overexcitation protective relay and method of operati Programmed overexcitation protective relay and method of operati

1985-04-26

1987-09-15

Scott, J. R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 78, 361 91, H02H 709

Patent

active

046943749

ABSTRACT:
A programmed overexcitation protective relay with selectable time-overexcitation operation to govern the interruption of energy to a piece of power equipment, like a transformer, generator or the like. A programmed processor is included to derive an overexcitation time-to-trip in accordance with sampled measurement voltage values of at least one power line supplying energy to the power equipment being protected, and selected derivation constants stored in a memory look-up table. The derivation constants are selected from the look-up table based on derivation parameters which may be set and read by the programmed processor from time to time. The programmed processor utilizes the selected derivation constants to derive the time-to-trip over a number of predetermined time intervals during which the overexcitation condition persists.

REFERENCES:
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ASEA Specifications of V/Hz Overexcitation Relay, Type RATUB, Bearing No. B03-5011, (5/30/82).

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