Technical Guide
Testing self-powered relays with SVERKER 900
Page 10(33)
5. Testing WIC-1 overcurrent relay with SVERKER 900.
5.1. Introduction
The WIC-1 relay is connected to the protected feeder via a special multi winding CT.
The one winding of the CT is the test winding. The test secondary current is injected from dedicated test
terminals (see par. 3.1).
There are different standard CT types available for the WIC-1. The current transformer used in this document is
W1C1-W2AS1 (Figure 6 and Figure 7).
The selected nominal primary current
“Is” will be chosen to be 20 A.
Figure 6. The multi winding CT of
type W1C1-W2AS1
The relay settings are made with dipswitches on the front, see manual [5] for details about how to set the relay.
The overcurrent setting for primary start value are set by the position of dipswitches 1-1 to 1-4 The secondary
set value is then decided from this setting and has the same value for all standard CTs. The settings for I> and
I>> are then related to this value.
Figure 7 shows the meaning of the dipswitches, together with the position of the dipswitches for the tested WIC-
1 relay.
