Calculation for Earth fault relay

[Jason_tcs]

Dear friends,


May I know how to calculate the Earth fault relay/ Earth leakage relay? When we going to use them? Thank you.


Regards,
Jason

 

[anorlunda]

Welcome to PF.

I suggest the textbook "The art and science of protective relaying ". You can read it online free at

http://www.gegridsolutions.com/multilin/notes/artsci/

 

[berkeman]

Dear friends,


May I know how to calculate the Earth fault relay/ Earth leakage relay? When we going to use them? Thank you.


Regards,
Jason

Welcome to the PF.

In addition to anorlunda's reference, you can read through the Wikipedia page about smaller-scale Earth Fault protection devices:

https://en.wikipedia.org/wiki/Residual-current_device