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Measuring Riddle No.6 - CT & PT Circuit diagram
If we have 4-wire 3 phase or 3-wire 3 phase system (generator), how many CT & PT do we need for Ampmeter, voltmeter, power factor, etc.. measurements??  

+  3 CT and 3 PT or 2 CT & 2 PT or else??

I tried to search the topic on google, but couldn't get any usefull.  Can someone please tell me.

Author : Bethy M - From: Vietnam
Sat, April 30th, 2011 - 17:25
Author : Hamid - From: Iran
Thu, July 18th, 2013 - 11:00
You need 3 CT only. for 400V voltage system is not required any PT-only fuses, except for spcific requirements (un frequemly).
Author : mahadi.ramlan - From: INA
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