REF Relay


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I want to test one REF Relay with $ CTs in a project. i have doubt about the setting of the relay. and resistace value to be setted. i have 1A Ct secondary. relay setting is 10% means how much in the relay i have to set 0.1?. i some of the catelougus which i refferd shows the fault current setting.

how we have to select the requirments of REF protection CTS?