Seg WI Series User Manual

4.6 I2/I1> – Unbalanced Load [46]
The protection function »I2/I1>« is similar to the Phase Overcurrent protection. The main
di󰊞erence is that the Phase Overcurrent protection monitors the three phase currents,
whereas the »I2/I1>« module monitors the negative-sequence current I2 (in comparison
with the positive-sequence current I1).
• IEEE C37.2 / ANSI 46 — Unbalanced Load Protection.•
For general information about the concept of WIC1 protection functions, see ╚═▷
“4.1 »Prot« – General Protection Module”.
NOTICE!
High inrush currents can lead to a transient saturation of the phase CTs. When this
happens during a transformer inrush the determination of (positive and negative)
sequence currents yields incorrect results.
153WIC1WIC1-1.0-EN-MAN
4 Protective Elements
4.6 I2/I1> – Unbalanced Load [46]

Seg WI Series Specifications

General

Brand	Seg
Model	WI Series
Category	Relays
Language	English