GE Multilin 345 Instruction Manual page 150

S2 SYSTEM SETUP
6–34
- phase and zero sequence compensated winding phase currents (see earlier).
In our example, the following phase and zero-sequence compensation equations would
be used:
For Winding 1 (Wye – grounded neutral):
For Winding 2 (Delta):
The complete compensated winding 1 and winding 2 currents would be as follows:
DIFFERENTIAL AND RESTRAINT CURRENT CALCULATIONS
Differential currents are calculated as follows:
Restraint currents are calculated as follows:
where,
are the phase differential currents, and
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: SETPOINTS