Method and device for preventing understabilization of longitudi

Details Method and device for preventing understabilization of longitudi Method and device for preventing understabilization of longitudi

1993-05-11

1994-11-22

DeBoer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 65, 361 87, H02H 332

Patent

active

053674251

ABSTRACT:
A method and a device for preventing understabilization of longitudinal differential protections in case of external faults and current transformer saturation. The invention comprises an extension of the state of the art with regard to stabilization of longitudinal differential protections in such a way that the values (A1, A2, . . . An), (.phi.1, .phi.2, . . . .phi.n), obtained via current measurement (C1, C2, . . . Cn) and Fourier filters (4, 5, 6), for determining the function characteristic of the protection under certain conditions as regards current amplitude and current transformer saturation are given corrected values (A1k, A2k, . . . Ank), (.phi.1k, .phi.2k, . . . .phi.nk) (FIG. 2).

REFERENCES:
patent: 4377834 (1983-03-01), Eriksson et al.
patent: 4731689 (1988-03-01), Nimmersjo et al.
patent: 5202812 (1993-08-01), Shinoda et al.
High-Speed Distance Relaying Using a Digital Computer; Gilcrest et al.; Paper No. 71TP 566-PWR; IEEE Power Engineering Society; May 27, 1971; pp. 1235-1243.

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