×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

AC and DC HiPot Tester

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

RE: AC and DC HiPot Tester

It's been a long time since I've worked in hi-pot testing.

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

This subject is widely discussed on the web. Do a search but for starters here is a link to get you going.
http://www.compwest.com/library.htm

RE: AC and DC HiPot Tester

We use Hi-Pot testers from Associated Research.

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.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources