GE G60

9-8 G60 Generator Protection System GE Multilin
9.1 SETTING EXAMPLE 9 APPLICATION OF SETTINGS
9
AUXILIARY OV1 menu:
b) 100% STATOR GROUND
The auxiliary voltage input is required for both the 100% stator ground and the third harmonic neutral undervoltage ele-
ments. Therefore the NEUTRL source will be assigned for these elements. Make the following changes in the
SETTINGS
 GROUPED ELEMENTS  SETTING GROUP 1  STATOR GROUND menu
STATOR GROUND SOURCE: "SRC 2" (the "NEUTRL" source)
This 100% stator ground element provides ground fault protection for the neutral end of the stator winding. The element
has two stages. In this application, stage 1 is used to trip the machine and stage 2 is used for alarm purposes. Set the
pickup to 0.15 for both stages to provide adequate overlap with the auxiliary overvoltage element. Set stage 1 to 0.375 V
secondary (this value may be increased for security in particularly noisy environments). Stage 2 is typically set at 0.3 V sec-
ondary. The supervision settings are expressed in per unit of the
NOMINAL PHASE VT SECONDARY setting. The time delay
settings are 5 seconds and 1 second for the Stage 1 and Stage 2 elements respectively.
, (EQ 9.31)
Make the following changes in EnerVista UR Setup or through the SETTINGS  GROUPED ELEMENTS  SETTING GROUP
1  STATOR GROUND  100% STATOR GROUND menu:
STG1 SUPV
0.375 V
66 V
---------------------
0.0057 pu==
STG2 SUPV
0.300 V
66 V
---------------------
0.0045 pu==