Method and system for providing protective relay functions

Details Method and system for providing protective relay functions Method and system for providing protective relay functions

1995-03-16

1997-01-07

Voeltz, Emanuel T.

Boots, shoes, and leggings

364480, 324522, 361 20, 361 83, H02H 300

Patent

active

055923933

ABSTRACT:
In a relay protective system a method of providing volts per Hz, loss of field, ground differential, phase distance and over voltage protective relay functions. In addition, the inventive method provides an improved method to selectively block any of the above functions in response to input contacts and selectively activate output contacts in response to operation of the above functions using programmable inputs and outputs.

REFERENCES:
patent: 4825323 (1989-04-01), Wilkinson
patent: 5367426 (1994-11-01), Schweitzer, III
Yalla, "A Digital Multifunction Protective Relay", Transactions on Power Delivery, vol. 7, n. 1, Jan. 1992, pp. 193-201.
Li, "A Study on the Improved Performance of Half-LENS-Half-MHO Relays", IEEE Trans. on Power Apparatus and Systems, vol. PAS-103, No. 12, pp. 3539-3544 Dec. 1984.
Cadick, "Impedance Relays", Plant Engineering, v.38, p. 44 Jan. 1984.

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