2 WIC1 – Introduction and General Information
WIC1
WIC1_Z17
0.4 kV
7.2 kV / 10 kV / 20 kV
Fig. 1: Basic circuit diagram of a standard switchboard with 2 feeders and 1 outgoing
transformer panel.
Introduction
The WIC1 is a CT-powered protection relay with inverse time and deó°ŠŸnite time protection
characteristics and is speció°ŠŸcally designed for switchboards with CBs and small rated
output currents.
Together the speció°ŠŸc CTs and the WIC1 form a joint protective system. A low-energy coil is
needed for realizing trip of the CB.
The generation 2 of the WIC1 (also, short: WIC1 g2), that is described in this document,
is the successor protection device of SEG's well-established WIC1 (for dió°Šžerentiation also:
WIC1 g1), that is reliably in service within hundreds of thousands of MV switchboards.
The requirements on MS distribution stations with circuit breakers call for a robust protection
relay which is optimized accordingly and an integral part of the respective switchboard. The
WIC1 is a time-overcurrent relay that SEG has developed speció°ŠŸcally for such requirements.
The WIC1 is a CT-powered protection relay with minimal space requirement, that complies
with the highest demands on a digital protection device. Simple but safe wiring, high
electromagnetic interference immunity, uncomplicated adjustment and the ability to scale
to dió°Šžerent power quantities of the switchboard, helping the switchgear manufacturer to
minimize costs. The WIC1 represents a protective system with a guaranteed maintenance-
free period of 25 years, the same as for the switchboard.
The SEG protection relays of the WI Line are oó°Šžering time-overcurrent protective
functions and earth fault protective functions in the well-proven technique for CT-powered
protection relays.
As a CT-powered protection relay the WIC1 is mainly used in MV switchboards with circuit
breakers, protecting distribution transformers in local and industrial networks. Due to its
small size the WIC1 is very well suited for the use in compact switchboards.
17WIC1WIC1-1.0-EN-MAN
2 WIC1 – Introduction and General Information
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