Seg WI Series User Manual

11.2.1.2.5.3 Extremely Inverse - Characteristic (IEEE C37.112) – Phase Overcurrent Protection
»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
I / I> (multiples of pickup)
tChar=
wiPDOC_Z07
Fig. 87: EINV: 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.
.
286 WIC1 WIC1-1.0-EN-MAN
11 Appendix
11.2.1.2.5.3 Extremely Inverse - Characteristic (IEEE C37.112) – Phase Overcurrent Protection

Seg WI Series Specifications

General

Brand	Seg
Model	WI Series
Category	Relays
Language	English