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sandeep.kv
Active Contributor

Join Date: Jan 2011
Location: Madhya Pradesh- India
Posts: 13

Current Transformer

01/18/2011 3:45 AM

Where CT should be installed. Before or after Breaker? How does it work?
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Anonymous Poster
#1

Re: Current Transformer

01/18/2011 3:52 AM

http://cr4.globalspec.com/thread/64878/a
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electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#2

Re: Current Transformer

01/18/2011 12:07 PM

Generally after the breaker. For, if it is mounted before the breaker and if there is some fault within the breaker, even though the CT will sense this, whom will he send trip signal to, as the breaker itself is under fault.
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elect-ok
Power-User

Join Date: Sep 2008
Location: Jakarta, Indonesia
Posts: 104
#4
In reply to #2

Re: Current Transformer

01/24/2011 11:10 AM

electricalexpert65,

talking about CT, do you have reference about kind of CT that can be like a clamp....?

because i want to install additional CT under the cubicle (at gland box), and the regulation need us to install that CT without shutdown the plan (wihout disconnect cables). my cubicle is 20 kV cubicle. and i have 2 x 1c x 240 sqmm each phase.

thank you for your kindness
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Anonymous Poster
#3

Re: Current Transformer

01/22/2011 9:38 AM

it should be installed on one lead after the breaker. it is ratio sized. example: 25:5 ct.
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