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Anonymous Poster

Relay CT Ratio

10/08/2010 1:05 AM

We have a MICOM Relay which is used for Feeder protection.

Its CT Rating is 5A.

How to use the above 5A Relay for 1A CT.
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mountk2
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Join Date: Jun 2010
Posts: 348
Good Answers: 10
#1

Re: Relay CT Ratio

10/08/2010 3:52 AM

Use the password (given by manufacturer) to enter into the relay registers.

Insert the desired changes, press save and exit.

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mountk2
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Join Date: Jun 2010
Posts: 348
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#3
In reply to #1

Re: Relay CT Ratio

10/08/2010 3:23 PM

Each relay of the MiCOM P14x range is equipped with 1A & 5A software settings...

http://www.areva-td.com/solutions/US_412_US::Solutions::Automation::MiCOM+P14x.html

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msamad
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Join Date: Feb 2009
Location: Houston, USA
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#2

Re: Relay CT Ratio

10/08/2010 2:00 PM

The AREVA MiCOM Feeder Management Relay (P14x series) has both 1A and 5A current ratings and they have the separate terminals for the connection. See the 'Technical Data Sheet' for MiCOM P141/2/3 (Feeder Management Relays) for detail.

http://areva-td.com/static/content/1139218271939-P14x_EN_TDS_A11.pdf

In Page 8, see "AC Current: Nominal current (In): 1A and 5A dual rated. (1A and 5A inputs use different transformer tap connections, check correct terminals are wired)".

For the wiring diagram, see the pages 32 through 44 for the connection details of 1A and 5A terminals. The 1A input is connected to the terminals C2, C5, C8, C11 and C14, while the 5A input is connected to C1, C4, C7, C10 and C13.

So, you can use either 1A CT or 5A CT with wiring them to the correct terminals.

- MS

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Anonymous Poster
#4
In reply to #2

Re: Relay CT Ratio

10/12/2010 2:54 AM

Yes i aware of that information,P14x series is having the site selectability configuration.

Problem is how to convert the 5A relay to 1A Relay.
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