6–34 345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
S2 SYSTEM SETUP CHAPTER 6: SETPOINTS
- 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
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