GE G60 Instruction Manual page 383

5 SETTINGS
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.
where: T = operating time
D = undervoltage delay setting (D = 0.00 operates instantaneously)
V = secondary voltage applied to the relay
V = pickup level
pickup
At 0% of pickup, the operating time equals the UNDERVOLTAGE DELAY setting.
NOTE
GE Multilin
D
T --------------------------------- -
=
V

1 ------------------
–

V
pickup
% of voltage pickup
Figure 5–111: INVERSE TIME UNDERVOLTAGE CURVES
G60 Generator Protection System
5.6 GROUPED ELEMENTS


842788A1.CDR
(EQ 5.28)
5
5-223