GE UR T60 Instruction Manual page 356

5.6 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
5-218
D
T --------------------------------- -
=
V

1 ------------------
–

V
pickup
% of voltage pickup
Figure 5–116: INVERSE TIME UNDERVOLTAGE CURVES
UNDERVOLTAGE DELAY
T60 Transformer Protection System


842788A1.CDR
setting.
5 SETTINGS
(EQ 5.44)
GE Multilin