Seg WI Series - Page 304

11.2.2.2.5.3 Extremely Inverse - Characteristic (IEEE C37.112)
»Char« = “IEEE EINV”
0.5
1
2
5
10
15
0.01 0.1 1 10 100
0.1
1
10
100
1000
t / s
IG / IG> (multiples of pickup)
tChar=
wiEDOC_Z07
Fig. 98: EINV: reset delay (left half, IG < I
G>
) and trip delay (right half, IG > I
G>
), example for
I
Dyn.Lim.
= 20⋅I
G>
.
See ╚═▷ “Explanation for All Characteristics (IG>, IG>>)” and ╚═▷ “11.2.2.2 Inverse-Time
Characteristics (IG>, IG>>)” for details.
Reset Delay
Various reset modes are available: Resetting via characteristic, delayed and instantaneous.
Trip Delay
If I
G>
< IG < I
Dyn.Lim.
, the trip delay is de󰊟ned by the characteristic.
For IG > I
Dyn.Lim.
, the trip delay t is kept constant at t = t
Dyn.Lim.
.
304 WIC1 WIC1-1.0-EN-MAN
11 Appendix
11.2.2.2.5.3 Extremely Inverse - Characteristic (IEEE C37.112)