GE L30 Instruction Manual page 339

5 SETTINGS
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 5–82: INVERSE TIME UNDERVOLTAGE CURVES
L30 Line Current Differential System
5.6 GROUPED ELEMENTS


842788A1.CDR
(EQ 5.22)
5
5-199