Method and apparatus for fault detection in a three-phase electr

Details Method and apparatus for fault detection in a three-phase electr Method and apparatus for fault detection in a three-phase electr

1974-05-14

1976-05-18

Envall, Jr., R. N.

317 36D, H02H 328

Patent

active

039581535

ABSTRACT:
The voltage-to-ground or neutral of one phase conductor of a three-phase line is compared with the mesh or interphase voltage of the other two phases on an amplitude basis and the comparison result is used to trigger a threshold switch if the former is much smaller than the latter. The threshold switch may be connected to the selector of an excitation system of a network protection assembly or a nonselective excitation system may utilize the outputs of the threshold switches for each of the three comparisons, in order to produce selective triggering of a network protection assembly.

REFERENCES:
patent: 3178616 (1965-04-01), Blackburn et al.
patent: 3210606 (1965-10-01), Calhoun
patent: 3612989 (1971-10-01), Souillard et al.
patent: 3629658 (1971-12-01), Helge et al.
patent: 3633072 (1972-01-01), Duncan

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