NEF, REF and BEF protection

[nyamzzim]

can someone explain NEF,BEF,REF protecrion to me?

 

[ScottyUK]

BEF - balanced earth fault. Unit protection for a delta-connected winding
REF - restricted earth fault. Unit protection for a star-connected winding

NEF - Neutral earth fault? Non-unit protection on the neutral-earth connection.

Have you tried using Google? If you search for the full name of the protection schemes instead of the abbreviated ones there is loads of information complete with diagrams which we can't match on a text-only forum.

 

[slavag]

NEF, probably : non directional earth fault protection.
Nming is used at ABB RE_54x series terminals.

 

[neilwm]

I have seen NEF used in the UK as a check function on 132kV transformer star points, it will prevent operation of Mesh Corner DAR ( A Unit ) when it operates. I agree with ScottyUK's description of REF and BEF.