ABB PQFA, Instruction Manual

Page: 40 / 98

PQFA Instructions Manual
Asea Brown Boveri Jumet S.A.
40
Figure 6.6. Connection between CT1, CT2 , the summation CT and PQF
for one phase.
6
6
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4
4
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2
2
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4
4
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C
C
a
a
s
s
e
e
4
4
:
:
t
t
w
w
o
o
i
i
n
n
d
d
e
e
p
p
e
e
n
n
d
d
e
e
n
n
t
t
f
f
e
e
e
e
d
d
i
i
n
n
g
g
t
t
r
r
a
a
n
n
s
s
f
f
o
o
r
r
m
m
e
e
r
r
s
s
.
.
Two independent transformers (the tie is normally open) feeds two different
set of loads. One active filter is fitted on each LV busbar.
This system may however also work in degraded mode: the tie is closed and
only one transformer feeds the whole LV system.
By connecting the CT’s as described hereafter, it is still possible to filter
properly the harmonics and to correct the power factor.
Figure 6.7. Two independent transformers: single-line diagram
PQF PQF
T1 T2
S1, k
S2, l
S1, k
S2, l
P1
P2
P1
P2
S1
S2
k
l
PQF
Side A Side B
P1, K
P2, L
P1, K
P2, L