AEG DUA2.1 Technical Manual And User Manual page 29

Inverse Time Delay Characteristic
The inverse characteristic is defined by the following formula :
where :
t
TMS
V
Vs
NOTE : this equation is only valid for
TMS
TRESET (only DT)
Hysteresis
Hysteresis 1.02... 1.05%
NOTE : this range is a percentage value of the pickup value of
the undervoltage elements
⎛
⎜
TMS
⎜
=
t
⎜
V
⎜
Vs
⎝
= operating time in seconds
= time Multiplier Setting
= applied input voltage
= relay setting voltage
0.5...100.0
40ms
⎞
⎟
⎟
⎟
−
1
⎟
⎠
V
ratio< than 0.95
V s
(by step: 0.5)