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satishhar
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Location: Karnataka, India
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Transformer Differential Protection Relay

03/05/2016 1:08 AM

Is differential protection relay operates for open circuit in any one of transformer winding? Explain

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TonyS
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#1

Re: Transformer Differential protection relay

03/05/2016 8:22 AM

Do your own homework

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satishhar
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#3
In reply to #1

Re: Transformer Differential protection relay

03/05/2016 12:27 PM

Dear Sir,

As per my homework, relay will not operate.

Is it right or wrong?

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RAMConsult
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#2

Re: Transformer Differential protection relay

03/05/2016 9:05 AM

Basic interview question, how did you respond?

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satishhar
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#4
In reply to #2

Re: Transformer Differential protection relay

03/05/2016 12:31 PM

Dear RAMConsult,

As per me it will not operate. Is it right?

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RAMConsult
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#6
In reply to #4

Re: Transformer Differential protection relay

03/15/2016 6:28 PM

Correct. Now can you tell me why?

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satishhar
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#7
In reply to #6

Re: Transformer Differential protection relay

03/18/2016 6:42 AM

If open circuit in any one winding, then the current in primary and secondary of the same phase will be zero. So there will be no difference of current in the same phase of primary and secondary. So in this case the differential relay will not operate.

right..??

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RAMConsult
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#8
In reply to #7

Re: Transformer Differential protection relay

03/18/2016 10:01 AM

Correct, as long as the sum of the currents going in equals the sum of the currents going out then the relay should not operate.

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satishhar
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#9
In reply to #8

Re: Transformer Differential protection relay

03/19/2016 1:44 AM

Thank You...

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mukeshkumar5609
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Location: Lucknow , Uttar Pradesh , India
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#5

Re: Transformer Differential Protection Relay

03/14/2016 1:43 PM

relay will be operate by my idea because relay work on current difference. if winding open than current value will be diffrent in each phase so relay will be work.

thanks

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moons
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#10

Re: Transformer Differential Protection Relay

04/07/2016 2:26 AM

Differential protection is operated with current. Without path (open CCT), no currents. We need to make path for electrons.
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moons (1); mukeshkumar5609 (1); RAMConsult (3); satishhar (4); TonyS (1)

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