Short Circuit Coordination Time

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Anonymous Poster #1	Short Circuit Coordination Time 05/15/2012 2:25 PM
	Any relay coordination expert familiar with short circuit study can tell what is the minimum time lag required to ensure Short Circuit coordination and selectivie protection curves on 11KV and 440 Volts power distribution system ? basis for the selection?
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wareagle Guru Join Date: Jun 2008 Location: Alabama Posts: 1604 Good Answers: 63	#1 Re: Short Circuit Coordination Time 05/15/2012 5:44 PM
	These will have your answer. http://ecmweb.com/design_engineering/low-voltage-motor-protection-20110201/index.html http://ecmweb.com/design_engineering/protective-device-coordiation-study-part-2-20110301/index.html http://ecmweb.com/design_engineering/protective-device-coordination-study-3-20110401/index.html
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electricalexpert65 Guru Join Date: Oct 2009 Posts: 2061 Good Answers: 169	#2 Re: Short Circuit Coordination Time 05/16/2012 9:40 AM
	Electromechanical Relays: Typical Grading Margin is 400 milliseconds Electronic Relays: Typical Grading Margin is 300 milliseconds
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