Technical Manual WIC1 SEG Electronics GmbH
DOK-TD-WIC1E, Rev. M 47
6.7.1 Test Currents
The transformation ratio of primary currents to secondary currents of the CTs are equally proportionate as the test
current via the CD winding to the secondary current. This means, no matter which CT type is in operation, for the
secondary test always the same test values are used.
Table 6.2:Test values via CD winding with the different CT types
This means when Is is multiplied with the setting value of the relevant protection element of I>, I>> or IE> it equals
the test current via the test winding. The CT type is of no consequence. The following tables show all setting values
for the protection steps I>, I>> and IE>.
6.7.2 Switching points for the overcurrent steps
Table 6.3: Test current via CD winding with the I> step and the different Is setting values