Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
426
Test with Secondary Test Equipment
Measurements are always performed from the side with the earthed starpoint. In transformers, there must be
a delta winding (d-winding or compensating winding). The side which is not included in the tests remains open
as the delta winding ensures low-ohmic termination of the current path.
The test setup varies dependent of the application. Figures 3-29 to 3-32 show schematic examples of the test
setup, with Figure 3-29 mainly for generator protection applications.
DANGER!
Primary measurements must only be carried out on disconnected and earthed equipment of the power system!
Perilous voltages may occur even on voltage-free plant sections due to capacitive influence caused by other
live sections.
Figure 3-29 Zero sequence current measurement on a star-delta transformer
Figure 3-30 Zero sequence current measurement on a star-star transformer with compensation winding
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