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frankcorners
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Join Date: Jan 2008
Location: Bangalore , India
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Injection testing.

11/04/2011 1:37 AM

What is Injection testing ? what are its uses?

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kvsridhar
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#1

Re: Injection testing.

11/04/2011 8:28 AM

Can you be a little more specific as to what is being injected? Assuming you mean 'secondary injection', it is a convenient way to test the health of the protection system...one injects an appropriate current into the input of the protective relay as if the CTs were delivering that current into it. This way, if the CTs are say 5000/5, you need to apply only 5A into the relay as opposed to 5000A in the Circuit Breaker's main contacts.

Is this what you meant?

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frankcorners
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#2

Re: Injection testing.

11/04/2011 3:25 PM

sridhar yea its almost on the |||lar lines, can u xplain more abt ht side cable injection testing ?

and the CT ratio that u considered is for meter calibration ?

pls clarify...Cos' they asked me in an interview which i told i am unsure ..

frank

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msamad
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#3
In reply to #2

Re: Injection testing.

11/04/2011 8:47 PM

There are some previous discussions available on this topic in this forum. You can search for them. Here are some of them that I think may be helpful:

http://cr4.globalspec.com/thread/54126/Difference-Between-Primary-and-Secondary-Injection

http://cr4.globalspec.com/thread/36822/current-injetion

http://cr4.globalspec.com/thread/24671/Electrical-over-current-testing

- MS

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electricalexpert65
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#4
In reply to #2

Re: Injection testing.

11/06/2011 9:09 AM

For HT Side Cable Injection, it is called 'Primary Injection Testing' and you need to have a high current source for conducting the same.

KVS's CT ratio could be for metering as well as for protection.
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frankcorners
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#5
In reply to #4

Re: Injection testing.

11/10/2011 1:11 AM

hey hi

what is KVS?

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kvsridhar
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#6
In reply to #5

Re: Injection testing.

11/10/2011 2:17 AM

Not what, who. CR4 denizen kvsridhar, a retired guy who occssionally writes, who has mentioned some CT ratio somewhere in this thread... me in fact. Namaste, glad to meet you.

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electricalexpert65 (1); frankcorners (2); kvsridhar (2); msamad (1)

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