Distance protection apparatus for electrical lines

Details Distance protection apparatus for electrical lines Distance protection apparatus for electrical lines

1978-09-20

1981-05-19

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 82, H02H 726

Patent

active

042688868

ABSTRACT:
By switching-in a trip boundary, which excludes the load range in the complex impedance plane, of a directed or non-directed end or final stage of a measuring system of a distance protection apparatus, it is possible to eliminate faulty or spurious triggering of the protection apparatus, notwithstanding a possible improper excitation. The functional reliability of the protection apparatus is thus improved and there is possible monitoring of fault functions where, in each case, there is logically coupled a "yes" or "no"-type output response of the measuring system with a "no" or "yes"-type excitation output by means of appropriate and comparison logic circuitry.

REFERENCES:
patent: 3201651 (1965-08-01), Calhoun
patent: 3303390 (1967-02-01), Sonnemann
patent: 3379933 (1968-04-01), Hoel
patent: 4092691 (1978-05-01), Williams
Publication Proceedings of the IEE, vol. 113, No. 10, Oct. 1966, pp. 1631-1642, "Composite Polor Characteristics in Multizone Systems of Phase-Comparison Distance Protection".
Publications Proceedings of the IEE, vol. 114, No. 7, Jul. 1967, pp. 936-938, Disscussion on-"Composite Polar Characteristics in Multizone Systems of Phase-Comparison Distance Protection".
Brown Boveri Review-"Protective Relays for Electrical Installations", vol. 53, pp. 737-872, Nov.-Dec. 1966, No. 11/12.

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