GE 889 - Windings

4–74 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
SYSTEM CHAPTER 4: SETPOINTS
Windings
NOTE
NOTE:
The K2 CT bank is connected to Winding1, which is the High-Voltage winding of the GSU
connected to the system. In contrast, the K1 CT bank is connected at the neutral side of
the generator, and it should be configured as Winding-2 (K1).
Path: Setpoints > System > Transformer > Winding 1 (K2)
Path: Setpoints > System > Transformer > Winding 2 (K1)
All transformer windings from 889 are associated with CT bank inputs. When overall
differential protection (87O) is selected in the order code option (12 A - Advanced
protection with K2 as CT bank instead of VT bank), the relay CT banks are mapped to
represent the winding currents as follows:
1. The K2 CT bank is linked to Winding1 (which is the high-voltage side of the GSU
connected to the system), hence the programmed primary rating of the K2 CT bank is
used as a base for magnitude compensation. It is strongly recommended that the
user wires the correct currents from the transformer winding CT to the K2 relay CT
inputs, and correctly programs the K2 CT bank primary and secondary ratings.
..\Transformer\Winding1
ItemName Value Unit
RatedMVA 5.000 MVA
NominalPhͲPhVoltage 13.800 kV
Connection Wye
Grounding NotWithinZone
W1
..\Transformer\Winding2
ItemName Value Unit
RatedMVA 5.000 MVA
NominalPhͲPhVoltage 13.800 kV
Connection Wye
AngleWithRespectToW1 0°
Grounding NotWithinZone
W2