Ct Locations For The Case Of Two Independent Feeding Transformers - ABB PQFM Instruction Manual

The CT ratio to be programmed in the filter is: 2X/5 where X is the primary side current
rating of the main measurement CTs (CT1 and CT2 in
The connection diagram of the main measurement CTs to the summation CTs and from
the summation CTs to the filter terminals is represented in
to be implemented for the three phases.
P1, K
P2, L
Side A
Figure 43: CT connections for the case of connections between CT1, CT2 , the summation CT

6.10.5 CT locations for the case of two independent feeding transformers

Two independent transformers (the tie is normally open) feed two different sets of
loads. One active filter is connected to each LV busbar. The system may also have to work
in degraded mode, i.e. the tie is closed and only one transformer feeds the whole LV
system. This case is illustrated in
PQF
By connecting the CTs as described in
to correct the power factor under the aforementioned conditions.
64 Electrical design and installation ç Manual Power Quality Filter PQFM
S1, k
S2, l
P1, K
P2, L
Side B
and the PQF for one phase
Figure
T1
Figure 44: Case of two independent feeding transformers
Figure 42
P1
S1
P2
P1
S1, k
S2
P2
S2, l
44.
Figure 45 it is possible to filter the harmonics and
above).
Figure 43. This diagram has
k
l
PQF
T2
PQF