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
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