×
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

Reverse transformation

Reverse transformation

Reverse transformation

(OP)
At 15 kV generator test cell there is a MV connection panel with circuit breaker. Generator wires are connected to CB line side. There is also a voltage measuring transformer in that panel. Between tests, (without test specimen) the power leads are hanged on the wall mounted hooks. The CB is open. The test power leads seem not to be connected on both ends. Now the question: is there a chance that the measuring transformer being fed from secondary side circuits (reverse excitation?), could develop a MV potential on the primary, thus making test leads energized? If this is a possibility, what would the safety measures to protect operators?

RE: Reverse transformation

Yes.
Air gap on the low side of the VT.

RE: Reverse transformation

Disconnect and lock the VT in position. If you are hands-on with the HV conductors they should be earthed by a circuit main earth, or at very least a hand-applied earth, to prevent them being energised. This should all be documented in your electrical safety rules.

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