Overexcitation - GE G30 Instruction Manual

9.1 SETTING EXAMPLE
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

GROUPED ELEMENTS
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:
Program the volts per hertz 1 element with an inverse characteristic (curve A), a pickup of 1.05, and a TDM of 40. Program
9
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
9-10
 
SETTING GROUP 1 PHASE CURRENT
Combined generator/GSU
limit curve
Figure 9–5: GENERATOR/GSU LIMIT CURVE
G30 Generator Protection System
 menu:
PHASE TOC1
Volts per hertz (p.u.)
Volts per
hertz 1
SETTINGS
9 APPLICATION OF SETTINGS
SETTINGS

9.1.9 OVEREXCITATION

Volts per
hertz 2
830734A1.CDR
 
GROUPED ELEMENTS
GE Multilin
SET-