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raj38
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Join Date: Oct 2009
Posts: 19

isolator

10/08/2009 12:18 AM

what is the purpose of isolator, generally we say it as a off-load device but we are not using in breaker less than 11kv feeder, and some said it is for indication that breaker is open but what is the correct answer
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electricalexpert65
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Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#1

Re: isolator

10/08/2009 5:43 AM

As per IEC, the definition for isolator is:

With the device in OFF condition and with 120% Voltgge available at the incoming side, the leakage current at the outgoing terminals should be less than 2 mA. In switches, this will be more than 6mA.

And, please note that there are ON-LOAD Isolators availabel in LV too (415V) even upto a current rating of 3200A.
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raj38
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Join Date: Oct 2009
Posts: 19
#2
In reply to #1

Re: isolator

10/08/2009 6:39 AM

but actually for heavy currents we will be using breaker for opening the contacts on ON-Load conditions hence the supply will be cut off on isolator,hence how would be this possible, i am not sure , you may be correct but clear me please
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