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nshingate
Associate

Join Date: Jan 2010
Location: Singapore
Posts: 26

66kV Indoor GIS Circuit Breaker & Isolator Comparison

09/24/2012 9:54 AM

Dear All,

This question I am putting up more from economical aspect than technical.

I want to know now a days most of the switchgear manufacturers are standardizing their items, is it still very economical to look out for the possibility of using an isolator to avoid the use of circuit breaker? (In case of indoor 33kV or 66kV GIS)

Isolator cost = X% of Circuit breaker cost (Same rated current & withstand capacity)

If anyone can give tentative value of "X" in above equation, it will be very helpful.
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RAMConsult
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Engineering Fields - Power Engineering - New Member

Join Date: May 2007
Location: NYC metropolitan area.
Posts: 3230
Good Answers: 444
#1

Re: 66kV Indoor GIS Circuit breaker & Isolator Comparison

09/24/2012 10:16 AM

An Isolator and a Circuit Breaker are two different pieces of equipment serving two different purposes. While a CB can substitute for an Isolator the opposite is not true. An Isolator does not have any load-break/make capability. Its main purpose is to isolate a section of bus to prevent energization in the event that a breaker inadvertently closes. It is there for maintenance/safety, not protection, purposes.

__________________
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debata07
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Join Date: Nov 2011
Posts: 131
Good Answers: 5
#2
In reply to #1

Re: 66kV Indoor GIS Circuit breaker & Isolator Comparison

09/24/2012 11:48 PM

Load break fault make isolators are also available in the market and can be procured if specified during purchasing. However, their purpose is entirely different as explained by RAMConsult. Moreover, the circuit breaker is provided with trip coil which is energised when the trip relay gets activated in case of faults e.g. short circuit, over current, earth fault etc. etc. This protection function is not available in isolator.

For pricing information you may consult any of the local suppliers indicating your technical requirements as the price is sensitive to country of origin and the technical parameters laid down in the specification.
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