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Anonymous Poster #1

IDMT Relay Setting

03/14/2013 2:32 AM

Dear friends,

We are having IDMT relay forgiving tripping command to SF6 breaker.Supply comes from EB is given to SF6 breaker & SF6 outgoing is connected to transformer,please any body give how the complete current & time setting calculation of IDMT relay.

Relay make:Alstom,CT sec:5A,Type:CDG61,

SF6 CT ratio:200:5,Full load current:1250 Amps

Transformer Rating:1.5MVA,11KV/0.433KV,Ipy:78.73Amps,Isy:2000 Amps,

Please ask any other data you need,

RK
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Muthuvel
Power-User

Join Date: Jun 2012
Posts: 115
#1

Re: IDMT relaysetting

03/14/2013 7:40 AM

Whether IDMT relay will serve for medium voltage circuit breaker(SF6 circuit breaker) ?
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PeterT
Guru

Join Date: May 2010
Location: Liverpool, NY
Posts: 961
Good Answers: 131
#2

Re: IDMT Relay Setting

03/14/2013 2:56 PM

You need to hire a qualified engineer to do a proper relay coordination study for your application. We can't see your system, don't have drawings to show how it is configured, don't have information on fault current values, or what relay (manufacturer, model, etc.) you have, or what standards apply in your particular situation or locale. Do you really think you should rely on unknown forum participants to do an engineering study or specify protection parameters for you???

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ramvinod
Guru

Join Date: Jun 2007
Location: chennai,India
Posts: 592
Good Answers: 19
#3

Re: IDMT Relay Setting

03/16/2013 12:01 AM

Settings can be suggested, But some more information such as load details, any motor loads, highest motor capacity with starting time, starting current details are required.

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 Ramesh,Freelance Electrical/automation Consultant
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sethuamanj
Active Contributor

Join Date: Mar 2013
Posts: 14
#4

Re: IDMT Relay Setting

03/17/2013 10:15 AM

with the given data u can set 2 Amp or 40% secondary current.. you should calculate time setting considering up stream relay for relay coordination.. Atleast 250ms time interval.
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