AEG DUA2.1 Technical Manual And User Manual page 31

Inverse Time Delay Characteristic
The inverse characteristic is defined by the following formula :
where :
t = operating time in seconds
TMS = time Multiplier Setting
V = applied input voltage
Vs = relay setting voltage
NOTE : this equation is only valid for
TMS
TRESET (only DT)
When the V> is associated with IDMT curve, the recommended
maximum setting value should be less or equal to max. setting
range divided by 20.
Definite time delay characteristics
tV>
tV>>
tV>>>
Hys teresis
Hysteresis
NOTE : this range is a percentage value of the pickup value of
the overvoltage elements
⎛ ⎞
⎜ ⎟
TMS
⎜ ⎟
=
t
⎜ ⎟
V
−
⎜ 1 ⎟
Vs
⎝ ⎠
V
Vs
0.5...100.0 (by step: 0.5)
0.00... 100.00s
0.00... 599.00s
0.00... 599.00s
0.00... 599.00s
95%
...100%
ratio > than 1.1