×
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

delta to wye problem

delta to wye problem

delta to wye problem

(OP)
hello   connecting 112.5 kva transformer delta 480V primary  and wye secondery 208V     voltage between  tubing  (ground)  and w  is _135 V     y is 237V  and e  is  330V  .connecting 60kva transformer  voltage is  0 V.  How to explaine that?   Can I connect X0  and ground  to  eliminate that "problem" thanks  

RE: delta to wye problem

Firstly, measure the voltages between X0 to each of the phases, if they all read 120V, then proceed to ground X0.

The X0 should always be grounded. Connected to the enclosure and also to building steel or other designated grounding electrode.

RE: delta to wye problem

(OP)
hi  i forgot to correct  on  60 kva trans.  voltage between ground to each phases is 120     but using 112.5kva  connected to the same line is 135V ,y is 237 and e  is 330 v. why difference on these transformators?  thank you

RE: delta to wye problem

If the x0 is not grounded, you will measure 'abnormal' voltages to ground, as it has no real reference point and only capactive coupling to ground.

Ground x0 to the enclosure and also to the buildnig steel/grounding electrode.

Your 60kVA x0 may already be bonded to the enclosure.



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