Polarity Testing of 15 KV Wound Type Current Transformer
Polarity Testing of 15 KV Wound Type Current Transformer
(OP)
Hi Guys,
We have a "15 KV Wound Type" Current Transformer, I want to perform Polarity Test. Can we use the Kick Method using 6 volts Battery? In the net, examples of Battery Kick Method are only Ring or Doughnut type. Are there any safety concerns during testing?
Thanks.. Kibz
We have a "15 KV Wound Type" Current Transformer, I want to perform Polarity Test. Can we use the Kick Method using 6 volts Battery? In the net, examples of Battery Kick Method are only Ring or Doughnut type. Are there any safety concerns during testing?
Thanks.. Kibz






RE: Polarity Testing of 15 KV Wound Type Current Transformer
I use a version of the test where I discharge a capacitor with a diode parallel to the capacitor. By doing that, I do not risk DC saturating the core and I do not risk a very high kick-back when I disconnect the source, since it is already discharged by then. The parallel diode works as a free-wheeling diode and prevents the circuit from oscillating so there will be only one deflection of the needle/trace and there will be no ambiguity. It also prevents the capacitor from being charged wrong way if you use an electrolytic capacitor, which I recommend.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: Polarity Testing of 15 KV Wound Type Current Transformer
As you are aware, this is very simple to understand. So in my view, you should go ahead with the testing using the Kick Method.
The caveat is that, if it is a laboratory level precision CT probably, you may further review the testing method, which I am not aware of the requirement.
RE: Polarity Testing of 15 KV Wound Type Current Transformer
RE: Polarity Testing of 15 KV Wound Type Current Transformer
Thank you very much for sharing your knowledge on this subject & also your time.
Regards.Kibz