What is FIR Relay in transformer...

[ericsson]

anybody knows about FIR relay in transformer? give details please. I have faced this problem in an interview?

 

[Guest123]

Hey.

High impedance faults (HIF) are faults which are difficult to detect using standard overcurrent protection relays for earth and phase fault detection.

FIR (Finite Impulse Response) filter banks recognize the distortion of the voltage and current waveforms caused by the arcs usually associated with HIF, by yielding 3 phase voltage and current at a set frequency and inspecting the pattern displayed against a pre set pattern, usually based on an algorithm.

That is my understanding anyway, hope it helps.

 

[ericsson]

Thank u so much friend....