Earth Leakage Relay connection with normal CT

[IBRAHIM HAMEED]

Earth Leakage Relay and Earth Fault Relay is functioning different. Right?
Do Earth Fault Relay is work with normal C.T. not a CBCT. Right?
Can you please give me some more information on this ..
Thanks

 

[westward10]

The only way for certain is to contact Delab they will tell you exactly what is required.

 

[westward10]

I have just been looking online for the earth fault and earth leakage relays from Delab. Wiring diagrams differ as it shows a CBCT for the leakage relay and CTs for the fault relay.

 

[IBRAHIM HAMEED]

I’m posting this question because, one of my friend are studying Electrical program. There instructor saying CBCT will create using 4Nos of Normal CT. I’m also not believing this. That’s why I’m discussing. I think DELAB EFR will not working using CBCT. Only ELR will work. I’m right? And also DELAB ELR will not working using normal C.T. I’m right? What’s your idea?
Thanks

 

[westward10]

CTs can be used for overcurrent and fault relays but a CBCT is used for a leakage relay but never say never. If you used CTs for a leakage relays to me it will be constantly tripping, a CBCT doesn't give an output when no leakage is present.