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Anonymous Poster

Install CT Before or After Breaker?

01/18/2011 3:37 AM

where should be CT installed? Before or after breaker
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justinanto1987
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India - Member - Justin Anto Engineering Fields - Electrical Engineering - Marks never made me laugh, but good memories did

Join Date: Sep 2010
Location: Thrissur, Kerala, India
Posts: 177
Good Answers: 3
#1

Re: a

01/18/2011 3:41 AM

You can install anywhere in the circuit, but it should seies to the circuit .

It will not make a difference if you installing ''befor or after the breaker''

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sandeep.kv
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Join Date: Jan 2011
Location: Madhya Pradesh- India
Posts: 13
#2
In reply to #1

Re: a

01/18/2011 4:03 AM

ok. What should be the fault level of 11 KV system. Should the fault level of transformer and distribution circuit same or different? how to calculate fault level of bus bar , transformer and switchgear used for 11 KV
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Anonymous Poster
#3
In reply to #2

Re: a

01/18/2011 4:54 AM

You have first find the Fault MVA from the source. Then find the fault at the required level by reducing the source fault by the impedance of the components in between.

Final use the basic power equation to find the fault current at that required point.
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sandeep.kv
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Join Date: Jan 2011
Location: Madhya Pradesh- India
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#5
In reply to #3

Re: a

01/18/2011 5:22 AM

Suppose Fault level of the source is 1000 MVA and impedance of the transformer is 12%. Then what be the bus duct fault level
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uday_5285
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Join Date: Jan 2011
Posts: 1
#6
In reply to #5

Re: a

01/18/2011 5:50 AM

send me email id i will send u info .
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sandeep.kv
Active Contributor

Join Date: Jan 2011
Location: Madhya Pradesh- India
Posts: 13
#8
In reply to #6

Re: a

01/18/2011 10:12 PM

Contact me by a personnel message.
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electricalexpert65
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Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#7
In reply to #5

Re: a

01/18/2011 12:09 PM

Pl. refer to IS 13234 or vto IEC 60909.
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Anonymous Poster
#4

Re: a

01/18/2011 4:55 AM

It is recommended pratice to install the CT after the breaker. Coz during the maintenance of CT itself it should not be the case that u should the shut dowm of entire panel.
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Anonymous Poster (2); electricalexpert65 (1); justinanto1987 (1); sandeep.kv (3); uday_5285 (1)

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