GE D30 Instruction Manual page 336

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 UNDERVOLTAGE DELAY setting.
NOTE
5-200
D
T --------------------------------- -
=
V

1 ------------------
–

V
pickup
% of voltage pickup
Figure 5–94: INVERSE TIME UNDERVOLTAGE CURVES
D30 Line Distance Protection System


842788A1.CDR
5 SETTINGS
(EQ 5.20)
GE Multilin