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ericsson
ericsson • Jan 15, 2009

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
vasanthmbs
vasanthmbs • Jan 15, 2009
FIR relay is induction relay..... same as other relays..
aj_onduty
aj_onduty • Aug 30, 2010
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 • Sep 3, 2010
[​IMG]

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

Regards,
VIPUL
Arp
Arp • Jan 13, 2011
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 • Jan 13, 2011
@ARP
Can you please tell what is HIF?
Arp
Arp • Jan 14, 2011
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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