Technical Manual WIC1 SEG Electronics GmbH
DOK-TD-WIC1E, Rev. M 13
4. Operating instructions
4.1 General information on the WIC1
All available versions of the WIC1 relay are a high-tech and cost-optimized protection for MV switchboards. Specif-
ically in compact switchboards, the WIC1 protection system in combination with a circuit breaker can replace the
combination of load-break-switch with HV fuses. Thereby in particular the overload protection for the attached unit
is improved clearly.
When power distribution networks are extended more and more high powered transformers are used and here HV
fuses are inadmissible. For such applications the WIC1 protection system is an optimal replacement.
All WIC1 versions are provided with three analogue measuring inputs (3x phase current). The current measuring
inputs are specially adjusted to the CTs allocated to the WIC1 protection system. There are 6 different CT ratios
available for the protection system WIC1 which are conditional on the rated system current. The successive devel-
opment towards the application time over current protection makes the system very user friendly. Setting of param-
eters as well as reading of tripping values is done via the integrated interface. For this the user has one PC adapter
and the software “WIC-Soft2” at hand.
As an alternative to the adjustment via interface it is also possible to do this by means of DIP switches (for relay
version WIC1-2) or by HEX switches (for relay version WIC1-3).
Cumulative current formation for earth current detection is programmed in the relay. The earth current is calculated
from the three phase currents (not available in WIC1-2F).
The WIC1 is provided with an input for remote tripping to which 115 VAC or 230 VAC can be connected. Tripping is
realized via the electric impulse output after max. 1 s.
A mechanical flag indicator WI1-SZ4 can be installed for optical signaling occurrence of trip conditions.
Furthermore it is possible to signal a trip event potentially free via the flag indicator WI1-SZ5. For this purpose the
flag indicator is equipped with two changeover contacts.
For versions WIC1-2/-3 activation of the relay is signaled by a LED which is above the switches and protected by
the clear plastic cover.
In order to simplify protective tests, the WIC1 has test sockets for connection of measuring lines of a three-phase
testing device which are used for feeding the CT test winding. Through this the entire protection system (CTs, pro-
tection devices, tripping coil) incl. the wiring can be tested.
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