Inverse Time Current Relay

Salient features of Inverse Time Current Relay:
* Software based design
* Programmable time current characteristics.
* Choice of four curves
* Wide setting ranges
* Draw-out case

Application :
The relay provides time graded phase and earth fault protection of generators, transformers, feeder, capacitors etc.,

Principle of operation :
The relay measures the lime current from each of the phases and if it exceeds the set threshold, then relay extends a trip signal after an operating time. The relay's operating time is determined by selecting one of the four inverse time characteristics. The relay has facility to active/inhibit the high set protection feature. The relay output contacts are self reset/hand reset type. Relay operation without any fault current is determined by trip test facility.