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vandie
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Join Date: Mar 2013
Posts: 39

ETAP Question - Custom Library for a Relay

04/02/2013 6:33 AM

When u are adding a custom library for a relay (from the "library" menu at the top) in ETAP 7.0, at the "relay library: model" window , in the "model info" section,,,, there is a parameter called "current setting". The value of which is one of the followings:

0.2

1

2

5

2/5

1/2

1/5

1/3/5

0.1/1/5

0.2/1/5

0.03/0.2/1/5

etc

Are these the currents which the relay can read as an input? so that if i set the current setting of a relay to, for example, 0.03/0.2/1/5. Then does it mean that the relay will only read the input accurately when the relay amps (CT secondary side / relay input) is equal to 0.03, 0.2, 1, or 5 ampere? can anyone confirm about this

regards

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daveross100
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Join Date: Dec 2011
Posts: 16
#1

Re: ETAP Question - Custom Library for a Relay

04/03/2013 9:25 AM

Your Question is NOT CLEAR

may be this will help

http://en.wikipedia.org/wiki/Relay
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vandie
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Join Date: Mar 2013
Posts: 39
#2
In reply to #1

Re: ETAP Question - Custom Library for a Relay

04/03/2013 12:42 PM

which part is not clear?

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msamad
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Join Date: Feb 2009
Location: Houston, USA
Posts: 946
Good Answers: 244
#3

Re: ETAP Question - Custom Library for a Relay

04/03/2013 7:17 PM

The current rating is the maximum input current that the relay can receive from the CT secondary. A relay can have only one current rating (such as 5) or multiple current rating (such as 1/5). If the current rating is multiple, the relay should have the option (either by programming or selector switch) to select the rating which one you want to use. For example, GE Multilin 469 relay has current rating 1/5 (see fig below):

In the "relay library: model" page of ETAP, you should select 0.03/0.2/1/5, only if the relay has four input current ratings, such as 0.03A, 0.2A, 1A and 5A. See the catalog of the relay that you are adding in the library and find the relay input current. Use the input current that the relay has in its catalog.

Hope it helps.

- MS

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vandie
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Join Date: Mar 2013
Posts: 39
#4
In reply to #3

Re: ETAP Question - Custom Library for a Relay

04/05/2013 8:56 AM

This is the answer i've been looking for. Thx a lot msamad.

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Anonymous Poster #1
#5
In reply to #3

Re: ETAP Question - Custom Library for a Relay

04/05/2013 6:38 PM

By the way... forgive my ignorance. How do you to upload a pic to a post in this forum?just like what you did in the above post. I'm still a newbie here. Thx
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msamad
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Join Date: Feb 2009
Location: Houston, USA
Posts: 946
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#6
In reply to #5

Re: ETAP Question - Custom Library for a Relay

04/05/2013 10:17 PM

This is a genuine question, and hence no hesitation.

You can use the Insert/Edit Image icon (shown yellow highlighted below) to add a picture file.

You can use Windows 7 snipping tool (Start -> Snipping Tool) to capture anything from your screen and save it as a picture (such as .png file) and insert it in your post.

Hope it helps.

- MS

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Anonymous Poster #1
#7
In reply to #6

Re: ETAP Question - Custom Library for a Relay

04/06/2013 4:47 AM

No2,,i didnt know there was a toolbar there to upload a picture. Coz it did not appear in my browser when i was trying to post sumthing. Now i realize i just had to change my browser to another one...so now the toolbar is there ..my mistake... thank youuuu...

Regards,,
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