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What is FIR relay in Transformer

I have faced this question in an interview, what is the use of FIR relay in transformer....?

if anybody knows please explain me..
thanks
regards
ericsson

Replies

  • vasanthmbs
    vasanthmbs
    FIR relay is induction relay..... same as other relays..
  • aj_onduty
    aj_onduty
    I am getting curious about this. How does it protect the transformer? what is its full form? What is its basic principle?How is its working?
    I am not expecting a full explanation about it, but I just want a basic knowledge about it. At-least give me the full form of it.
    I would be happy if anyone answers this.
    Thank you for trying to answer me(in advance).
  • d_vipul
    d_vipul
    [​IMG]

    CHECK OUT THIS DIAGRAM FOR MORE DETAILS..................

    Regards,
    VIPUL
  • Arp
    Arp
    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.
  • freak16
    freak16
    @ARP
    Can you please tell what is HIF?
  • Arp
    Arp
    High impedance faults (HIF) are faults which are difficult to detect using standard overcurrent protection relays for earth and phase fault detection.

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