Specifications

7SR242 Duobias Applications Guide

6.4 Transformer with Primary Connections Crossed on One

Winding

Reversing the connections on only one side of the transformer will reverse the phase sequence of the system. For

this arrangement W1 and W2 CT secondary wiring must be crossed over to replicate the crossovers on the

transformer primary connections – see fig. 6.5-1.

Figure 6-7 Dyn11 Transformer with Reverse Phase Notation

Notes:

The 7SR24 relay is set to correspond to the vector group shown on the main transformer rating plate i.e. Dy11,

+30°.

Relay instruments will indicate ’transformer’ quantities rather than system quantities.