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from the Automation List department...
Capacitor Voltage Transformers (CVT)
Engineering topic
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Posted by kaykay on 18 March, 2008 - 12:32 am
In EHV Transmission applications, Capacitor Voltage Transformer (CVT) is generally used even in GIS. Why is normal Electro-magnetic type Potential Tranformer (PT) not used? Is there any specific reason other than cost and PLC compatability? Please give some guidelines.
Reply to this post...
Posted by Phil Corso, PE on 21 March, 2008 - 11:30 pm
Cost is not proportional to voltage. Instead its quite disproportionate!

Regards, Phil Corso
Reply to this post...
Posted by Amir on 7 June, 2008 - 12:14 am
Hi there...

Of course there is another reason... VT is generally used for voltage levels up to the 63 kv, and for higher, you should apply CVT. It'll divide voltage levels between capacitors.

Take care...
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