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mahaveer singh rawat
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Join Date: Dec 2009
Posts: 2

How to Select Isolators

12/21/2009 2:18 AM

i want to know yhe criterion for selection of a isolator.i have to what rating's isolator for a 132 k.v. line whose loading is 135MW.
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luv123
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Join Date: Sep 2009
Location: INDIA
Posts: 92
#1

Re: isolator selection

12/21/2009 6:23 AM

Mahaveer,

Firstly isolator is current breaking device to protect the system from overcurrent & short circuit.to get FULL LOAD CURRENT divide MW by voltage /1.732/.8 you will get current.You can select nearest isolator rating of calculated current.Also mention the fault current rating required.
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luv123
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Location: INDIA
Posts: 92
#2

Re: isolator selection

12/21/2009 6:26 AM

also mention the voltage rating of isolator.
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kvsridhar
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#3

Re: How to Select Isolators

12/22/2009 6:12 AM

i am a little confused. i thought circuit breakers are there for short circuit protection and overload breaking. In low voltage at least, "Isolator" means a device which will safely "Isolate" the load from the mains voltage, and is capable of carrying and interrupting the rated current. If it is an "Off-load" isolator, it need not even be able to break any current. Both devices should be able to CARRY the SC current during the time the CB clears the fault though. So, the main characteristic of an isolator is the Voltage. And of course the rated current, and the carrying ability.

Perhaps things are different in the HV world?

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