GE T60 Instruction Manual page 381

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 --------------------------------- -
=

1 ------------------
–

V
pickup
% of voltage pickup
Figure 5–124: INVERSE TIME UNDERVOLTAGE CURVES
T60 Transformer Protection System
V


842788A1.CDR
5.6 GROUPED ELEMENTS
(EQ 5.44)
5-245
5