×
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

PT open delta and Wye wirings

PT open delta and Wye wirings

PT open delta and Wye wirings

(OP)
Hello all.
I have some issues with PT wirings. your help is appreciated in advance.
1- can Wye PT wiring (3 PTs) provide phase angle measurements?
2- the figure below shows the connection of a single PT to Schneider Vamp40 feeder protection relay. the manual says that with this configuration, all voltage functions such as:
27- undervoltage
59- overvoltage
32- reverse power protection
Are all these functions possible with this pt config?

RE: PT open delta and Wye wirings

27 and 59 can be performed on the L1-L2 voltage. Anything involving L3 or anything that shifts the L1 and L2 relative to ground without changing the phase-phase voltage will be missed. Assuming relatively well balanced currents and voltages the 32 function should work as well, but will probably have a wider dead band around zero.

RE: PT open delta and Wye wirings

Should the primary voltages be unequal it is possible to have reverse power on only one phase. Such an event may be missed with this connection.
With four wire wye:delta transformer banks reverse power on only one phase is an known issue.

Bill
--------------------
"Why not the best?"
Jimmy Carter

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


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close