are there any transformer need 3 REF protection?
are there any transformer need 3 REF protection?
(OP)
Dear all,
The Areva P643 has 3 REF protection function. However, in the real world, would there be any transformer need 3 REF protection?
i normally see Yy0d11 transformer (which will need 2 REF protection function), but i never see Yyy transformer.
therefore, is it safe to say only 2 REF function will be used (for a single transformer)?
The Areva P643 has 3 REF protection function. However, in the real world, would there be any transformer need 3 REF protection?
i normally see Yy0d11 transformer (which will need 2 REF protection function), but i never see Yyy transformer.
therefore, is it safe to say only 2 REF function will be used (for a single transformer)?






RE: are there any transformer need 3 REF protection?
Areva's P64x relays are differential protection relay in general. As you put it, even I haven't come across an YNynyn transformer yet. In which case what you say would be right.
But were the relay had to be used for protecting, for instance, a Reactor provided with bushing CT on either side of a phase used for REF protection, then you would need 3 functions, one for each phase.
RE: are there any transformer need 3 REF protection?
Ydd ( 3 winding transformer) transformer with two zig-zag transformers on the delta sides.
or Yyd, someting like to 110/35/6.6kV.
RE: are there any transformer need 3 REF protection?
Regards
Marmite
RE: are there any transformer need 3 REF protection?
RE: are there any transformer need 3 REF protection?
I have come across a power Transformer where all the windings have REF Prtn and the Vector Group of the Transformer Being YNyn0yn0d11 . This Transformer is used in one of the Water pumping Station.
Regards