Digital distance relays

Details Digital distance relays Digital distance relays

1980-03-14

1982-11-02

Gruber, Felix D.

Boots, shoes, and leggings

361 80, H02H 342, G06F 1520

Patent

active

043576664

ABSTRACT:
In a digital distance relay including sample-hold circuits for sampling the voltage and current of an electric power line system, analog-digital converters for converting the outputs of the sample-hold circuits into digital values, memory devices for memorizing the digital values and a program, and a central processing unit for exercising a relaying operation, there is provided a central processing unit which includes means for determining whether at least one of the digital values is greater than a predetermined value. The relaying operation of the distance relay is initiated only when the one digital value is greater than the predetermined value. A method is disclosed which includes the above determining step.

REFERENCES:
patent: 3379934 (1968-04-01), Hoel et al.
patent: 3474333 (1969-10-01), Hoel
patent: 3984737 (1976-10-01), Okamura et al.
patent: 4107778 (1978-08-01), Nii et al.
patent: 4212046 (1980-07-01), Andow et al.
patent: 4228476 (1980-10-01), Okita et al.
Elmlund: Distance Protection for Three--Phase Power Lines, ASEA Journal, vol. 35, No. 1-2, 1962, pp. 14-19.
Tegawa et al.: New Totally--Digitized Control System, Conference proceedings.
Conference on Automatic Control and Protection of Electric Power Systems, IFAC Symposium, 1977, pp. 33-35.

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