Overexcitation - GE G60 Instruction Manual

CHAPTER 8: APPLICATION OF SETTINGS
Figure 8-3: Third harmonic neutral undervoltage field measurements
The element is accurate for levels as low as 0.25 volts, secondary. In this case, the pickup setting is
The third harmonic dips below the pickup setting between 95 and 105 megawatts. The element needs to be blocked over
this range. A margin of 5% is added to the relay settings. The values for maximum and minimum power are
Voltage supervision is given a setting of 0.8 pu in order to prevent maloperation during a sustained undervoltage condition.
A time delay of five seconds is to be applied. If required, the element can be blocked when the machine is offline. Make the
following changes in the EnerVista software or the front panel
STATOR GROUND  3RD HARM NTRL UNDERVOLTAGE

8.2.11 Overexcitation

This protection is to be set to coordinate with the manufacturer's excitation capability curves. For the example system, the
combined generator/GSU limit curve is shown as follows.
G60 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1 
menu.
SETTINGS
Eq. 8-32
Eq. 8-33
Eq. 8-34
8
8-11