Half-cycle summation V/Hz relay for generator and transformer ov

Details Half-cycle summation V/Hz relay for generator and transformer ov Half-cycle summation V/Hz relay for generator and transformer ov

1996-12-13

1998-09-08

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Generator protective circuits

361 88, H02H 706

Patent

active

058053956

ABSTRACT:
A system for implementing accurate V/Hz value measurement and trip time determination for generator/transformer overexcitation protection independent of the conventional frequency tracking and phasor estimation based on Discrete Fourier Transformation (DFT) techniques. The half-cycle summation technique of the invention is a non-recursive digital technique which measures the per unit V/Hz value by summing the sampled data points in every half cycle of a sinusoidal input signal and dividing the sum with the ideal base sum value. When the input voltage signal is sampled at a reasonable frequency, the technique of the invention approximates the accurate per unit V/Hz value of the input voltage signal and thus obtains an accurate V/Hz characteristic directly without computing voltage and frequency separately.

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Pettigrew, et al., "Operating and Application Experience with a Microprocessor-Based Volts Per Hertz Relay," Fortieth Annual Conference for Protective Relay Engineers, Apr. 13-15, 1987, pp. 1-27.
Gabriel Benmouyal, "An Adaptive Sampling-Interval Generator For Digital Relaying," IEEE Transactions on Power Delivery, vol. 4, No. 3, Jul. 1989, pp. 1602-1609.

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