How generator energize big transformer
How generator energize big transformer
(OP)
Hi All,
I have an application for a 3MW 4160V 3Ph. 60Hz generator to energize a 10MVA step up tranasformer 4.16/27.6 Kv.
Can it be done ? If it can, what caution I should be awared ?
Appreciated for advise and comment !
I have an application for a 3MW 4160V 3Ph. 60Hz generator to energize a 10MVA step up tranasformer 4.16/27.6 Kv.
Can it be done ? If it can, what caution I should be awared ?
Appreciated for advise and comment !





RE: How generator energize big transformer
Your transformer should ideally have an LV delta winding.
You should carefully consider protection zones for overlapping unit protection schemes: gen diff, transformer biased diff, maybe an overall diff covering from gen neutral out to the HV breaker.
----------------------------------
If we learn from our mistakes I'm getting a great education!
RE: How generator energize big transformer
Check the CT specifications and the protection scheme. If it is switched on after full voltage is developed, CT may saturate and certain generator differential relays, if provided, may trip. This may not happen every time as the inrush varies with the exact instant of closing on the voltage waveform.
If you build up the voltage with breaker closed, it may work better, like a reduced voltage start. Or you will have to be creative with your protective relay settings.
I hope this is a one off setup and not a regular setup that requires frequent energizing and de-energizing of the transformer.
Rafiq Bulsara
http://www.srengineersct.com
RE: How generator energize big transformer
Muthu
www.edison.co.in