DIFFERENTIAL RELAY Russian patent published in 2005 - IPC

FIELD: electrical engineering; differential short-circuit protection of transformers.

SUBSTANCE: proposed relay designed for differential protection of transformers upon occurrence of short circuits at probable inrush magnetizing currents induced due to turn-on of transformer running at no load has intervening current transformer, rectifier unit, threshold unit, clock generator, AND gate, pulse counter, two recursive filters, adder, two OR gates, monostable multivibrator, RS filter, two short-pulse shapers, amplitude gate, subtraction unit, two final elements, and memory register; monostable multivibrator input functions as trigger input of differential relay.

EFFECT: enhanced precision and enlarged functional capabilities.

1 cl, 5 dwg