Differential protective relay apparatus

Details Differential protective relay apparatus Differential protective relay apparatus

1989-11-20

1991-02-05

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 44, 361 45, 361192, H02H 208

Patent

active

049910523

ABSTRACT:
An apparatus for differential-protection of a bus bar having a plurality of terminals which includes a plurality of trunk lines, in which an impedance of a differential circuit connected in parallel to a current transformer provided in each of the terminals is changed depending on either a terminal voltage of this differential circuit, or another terminal voltage derived from a part of the impedances. Then, either a high impedance differential relay, or a low impedance differential relay is selectively available so as to confirmly detect a fault in the bus bar.

REFERENCES:
patent: 4020396 (1977-04-01), Gambale et al.
patent: 4443828 (1984-04-01), Legrand et al.
patent: 4862308 (1989-08-01), Udren

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