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Directional Check
with C.T.'s in
Holmgreen
Connection
7UM62 Manual
C53000-G1176-C149-3
G
Figure 3-35
Directional Check with Toroidal Residual Current Transformers
If the current is supplied from a set of c.t.'s in Holmgreen connection (Figure 3-36), 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 into 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.
G
Figure 3-36
Directional Check with Current Transformers in Holmgreen Connection
3.4 Primary Commissioning Tests with the Generator
l
k
Z
Q7
Q8
R14
I
EE2
7UM62
Q7
Q8
R14
I
EE2
7UM62
n
e
R13
U
E
n
e
R
T
R13
U
E
381
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