GE G30 - Overexcitation

9-10 G30 Generator Protection System GE Multilin
9.1 SETTING EXAMPLE 9 APPLICATION OF SETTINGS
9
Since this element will coordinate with system protections a timed reset is chosen. The element must be blocked for a VT
fuse failure. The neutral source will be chosen. Make the following changes in EnerVista UR Setup or through the SETTINGS
 GROUPED ELEMENTS  SETTING GROUP 1  PHASE CURRENT  PHASE TOC1 menu:
9.1.9 OVEREXCITATION
This protection should be set to coordinate with the manufacturers excitation capability curves. For example system, the
combined generator/GSU limit curve is shown below:
Figure 9–5: GENERATOR/GSU LIMIT CURVE
Program the volts per hertz 1 element with an inverse characteristic (curve A), a pickup of 1.05, and a TDM of 40. Program
the volts per hertz 2 element with a definite time characteristic, a pickup of 1.23, and a time delay of 2 seconds. Both ele-
ments will issue a trip. The volts per hertz 1 pickup will be used to generate an alarm. Either source may be assigned in this
example. Make the following changes in EnerVista UR Setup or through the
SETTINGS  GROUPED ELEMENTS  SET-
Volts per hertz (p.u.)
Combined generator/GSU
limit curve
Volts per
hertz 1
Volts per
hertz 2
Time (seconds)
830734A1.CDR