Overexcatation Trip at first energizing Transformer...7UT613

[rayas91]

Friends ,

We re energizing MV Side with 15 KV /6,9 KV Auxiliary Transformer from 132 kV/15 KV Switchyard .But during the energizing, UAT Relay is trippinng from Overexcatation Protction.

I do not know why.Engineering side is sure about settings.
Transformer Nominal working Tap "14", It s trip at tap 14,but at the "9" tap no trip.

Can you help me please,

Relay is "7UT613"

 

[DTR2011]

Check the event reports on the relay. What is the voltage & frequency on tap 14?

 

[Krustabas]

At a first glance I would blame the settings. Would it be possible for you to show us the following settings: 4302 to 4313 (I assume it is version 4.xx relay)? Could you provide OLTC data (… kV +- … x …%)?

COMTRADE would be very useful as well (to see the voltage signal, which stage has tripped U/f> or U/f>>, tripping time etc.).

 

[rayas91]

Krustabas, Thank you for interested to reply my problem.


I fixed problem today..Actually it s my fault.

You know there s primary and secondary side of transformer.15/6,9 kv ....Normally the relay gets voltage information on 15 kv side...But i choosed 6,9 side ...so V/Hz seems %214-217....V/F seems 2,14-2,17...I changed it and everythgn ok now...


Thank you again ..and sorry for my english...

 

[waross]

Thanks for reporting back to us.

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

 

[rayas91]

you re welcome.