GE Multilin F35 Instruction Manual page 238

5.5 GROUPED ELEMENTS
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
5
At 0% of pickup, the operating time equals the
NOTE
5-116
D
T
= --------------------------------- -
⎛
V
1 – ------------------
⎝
V
pickup
% of voltage pickup
Figure 5–53: INVERSE TIME UNDERVOLTAGE CURVES
UNDERVOLTAGE DELAY
F35 Multiple Feeder Protection System
⎞
⎠
842788A1.CDR
setting.
5 SETTINGS
(EQ 5.17)
GE Multilin