AC and DC HiPot Tester
AC and DC HiPot Tester
(OP)
Dear All,
What is the based difference between AC and DC HiPot tester. When I test HV equipment e.g. Surge arrester, cable, generator winding, etc. What is the best method using ac or dc tester ?
Some one told me that mA is the "most important" to select DC or AC ? I didn't understand what does it mean.
Thank you.
Eskim
What is the based difference between AC and DC HiPot tester. When I test HV equipment e.g. Surge arrester, cable, generator winding, etc. What is the best method using ac or dc tester ?
Some one told me that mA is the "most important" to select DC or AC ? I didn't understand what does it mean.
Thank you.
Eskim





RE: AC and DC HiPot Tester
But I believe AC hi-pot testers are to test for insulation breakdown. The applied voltage is typically a few times the operating voltage (I think there are standards as to how much and for how long a time period, based on the type of equipment). The tester is current limited for safer operation. It trips an alarm when the pre-set leakage current is exceeded. For example, a 120VAC motorized power tool may have 600VAC applied for 1 minute and the current trip point set to a couple mA. The nature of the peak sinewave voltage actually 'stresses' the insulation.
DC based testers measure insulation resistance, I think. Never have used one.
Sure that there are many web sites out there that can provide a more thorough and accurate description of these testers.
Wheels within wheels / In a spiral array
A pattern so grand / And complex
Time after time / We lose sight of the way
Our causes can't see / Their effects.
RE: AC and DC HiPot Tester
http://www.compwest.com/library.htm
RE: AC and DC HiPot Tester
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RE: AC and DC HiPot Tester
http://www.asresearch.com/
UL allows DC testing at a higher voltage if there is too much capacitive feed through to pass the AC test.