GE Multilin g60

5-186 G60 Generator Protection System GE Multilin
5.6 GROUPED ELEMENTS 5 SETTINGS
5
The undervoltage elements can be programmed to have a definite time delay characteristic. The definite time curve oper-
ates when the voltage drops below the pickup level for a specified period of time. The time delay is adjustable from 0 to
600.00 seconds in steps of 0.01. The undervoltage elements can also be programmed to have an inverse time delay char-
acteristic.
The undervoltage delay setting defines the family of curves shown below.
(EQ 5.28)
where: T = operating time
D = undervoltage delay setting (D = 0.00 operates instantaneously)
V = secondary voltage applied to the relay
V
pickup
= pickup level
Figure 5–95: INVERSE TIME UNDERVOLTAGE CURVES
At 0% of pickup, the operating time equals the
UNDERVOLTAGE DELAY setting.
T
D
1
V
V
pickup
------------------–


--------------------------------- -=
842788A1.CDR
% of voltage pickup
Time (seconds)
NOTE