SEG Electronics GmbH Technical Manual WIC1
52 DOK-TD-WIC1E, Rev. M
6.10 Maintenance
The entire protection system WIC1 is designed for a maintenance-free period of 25 years, hence there are no spe-
cific jobs necessary to be done during the operating life of the relays. Very often, a periodical check of the protec-
tive adjustments is required by the end user. Such checks are left to the choice of the user and can be carried out
as described under 6.2.
6.10.1 Faults
Should, however, faults occur despite the special design of the protection system and the comprehensive quality
control, the possibility for fault clearance by the user is only limited. For possible faults and their clearance please
see the following table:
Wrong measuring and trip-
ping values
Test winding short-circuited
Secondary side of test winding
always to be operated openly
(except when relays are test-
ed)
Wrong measuring and trip-
ping values
Earthing of a winding terminal
of the measuring winding
No winding terminal of the
measuring winding to be
earthed! Earthing is done in-
ternally and brought out at
terminal PE
Low-energy tripping coil does
not trip
Coil polarized with permanent
magnet wrong connected to
TC+ and TC−
6.10.2 Repair work
The WIC1 is a hermetically sealed relay and so it is not possible to do any repair work at your end.
Due to the optimized cost structure, however, repair in our works is also not beneficial. During the warranty period
the protection relay is exchanged by us free of charge, provided the failure was not caused by external influences.
Should such a situation occur, please contact our local sales agent.
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