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ruchir_bhoglekar
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Join Date: Feb 2009
Posts: 2

Trip Times and Relay Coordination

02/10/2009 5:08 AM

tripping time criteriya for fuse ,ckt bkr ,mccb, contector etc
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sb
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Join Date: Mar 2007
Posts: 2550
Good Answers: 103
#1

Re: relay coordinatin

02/10/2009 6:16 AM

The trip times (I am assuming motor) are usually derived from tables given in IEC 60947 (previosly IEC 947-1) to identify the most appropriate Overload Trip Class, for the trip curve as close as possible to but below the overload curve of the motor. This way unnecessary tripping is minimised and the motor is adequately protected.

In case of other type of loads too, the load curve has to be matched and beased on that the relays are set.

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