# What is the difference between restricted earth fault relay and stand by earth fault relay?

 Restricted earth fault is a type of differential protection – normally connected across a transformer secondary to protect the windings. You can see a note on this here: http://myelectrical.com/notes/notes-view/articleid/9/restricted-earth-fault-protection Standby earth fault is general earth fault protection (usually measuring everything from the transformer secondary downstream). Normally this is implemented with a CT in the transformer neutral answered 3/26/2012 Steven McFadyen 246

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