Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
436
Figure 3-37 Directional check with toroidal transformers
Directional Check in Holmgreen Connection
If the current is supplied from a Holmgreen connection, the displacement voltage is obtained in the same
manner as in the above circuit. Only the current of that current transformer which is in the same phase as the
by-passed voltage transformer in the delta connection is fed via the current path. In case of active power in
generator direction, the same conditions apply for the relay - in principle - as with an earth fault in generator
direction in a compensated network and vice versa.
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