Seg WI Series - Page 276

11.2.1.2.1 IEC 60255‑151 Curves (I>, I>>, I>>>)
11.2.1.2.1.1
Normal Inverse (IEC 60255‑151)
»Char« = IEC NINV
0.01 0.1 1 10 100
0.01
0.1
1
10
100
t / s
I / I> (multiples of pickup)
0.05
0.1
0.2
0.5
1
1.5
tChar=
wiPDOC_Z01
Fig. 78: NINV: reset delay (left half, I < I
>
) and trip delay (right half, I > I
>
), example for
I
Dyn.Lim.
= 20⋅I
>
.
See ╚═▷ “Explanation for All Characteristics (I>, I>>, I>>>)” and ╚═▷ “11.2.1.2 Inverse-
Time Characteristics (I>, I>>, I>>>)” for details.
Reset Delay
Various reset modes are available: Resetting via characteristic, delayed and instantaneous.
Trip Delay
If I
>
< I < I
Dyn.Lim.
, the trip delay is de󰊟ned by the characteristic.
For I > I
Dyn.Lim.
, the trip delay t is kept constant at t = t
Dyn.Lim.
.
276 WIC1 WIC1-1.0-EN-MAN
11 Appendix
11.2.1.2.1 IEC 60255‑151 Curves (I>, I>>, I>>>)