Seg WI Series User Manual

9.2.1.3 Unbalanced Load [46], Negative-Sequence Current Protection [51Q]
Protection Stage I2> Accuracy
Pickup value »I2«
for I within 0.5 … 2 In
±6% of the setting value or ±3% of the greatest
phase current value.
Dropout Ratio 95%
Protection Stage I2/I1> Accuracy
Pickup value »I2/I1«
*5)
for I within 0.5 … 2 In
±2% (absolute)
Dropout Ratio 95%
Protection Stages I2/I1>, I2>
De󰈛nite time
(»Char« = “DEFT”)
Accuracy
Tripping delay »t« ±1% or ±10 ms
Operate time (for »t« = 0 ms)
at testing current ≥ 2 times pickup value
<70 ms
*1) *2) *3)
Protection Stage I2>
Inverse-Time / Characteristic curve
Accuracy
Start time (for »t« = 0 ms)
at testing current ≥ 2 times pickup value
<70 ms
*1) *2) *3)
Tripping delay
For testing current in the range 2 … 10
times pickup value
±6% or ±70 ms (according to the selected curve,
see ╚═▷ “11.2.3 Characteristics »I2>«”)
Operate time = Start time + Tripping delay
*1)
These start / pickup times are only valid under the following conditions:
•
either: minimum current in 3 phases > 0.5⋅In
min
for at least 0.5 s,
•
•
or: externally supplied (only WIC1‑4).
•
*2)
While being CT-supplied, the start times might be longer because the WIC1 has to collect
enough electrical energy for a trip pulse.
217WIC1WIC1-1.0-EN-MAN
9 Technical Data
9.2.1.3 Unbalanced Load [46], Negative-Sequence Current Protection [51Q]

Seg WI Series Specifications

General

Brand	Seg
Model	WI Series
Category	Relays
Language	English