Manual Power Quality Filter PQFS
Electrical design and installation 49
M
ax
im
um
rm
s c
ur
rent
of
the
dow
ns
tream
loads
(i
nc
ludi
ng s
tar
ting
cur
rent
of
D
C
dr
iv
es
):
X1
=
…
.. A
rm
s
M
ul
tipl
y X
1 by
1.
6:
X2
=
…
. A
rm
s
C
T c
abl
es
>
30 m
et
er
s ?
Sel
ec
t 3 i
dent
ic
al
CT
’s
s
uc
h t
hat
:
-
rat
in
g at
p
rim
ar
y
≥
X
2
- r
at
in
g at
seco
nd
ar
y:
5A
- B
ur
de
n
≥
15 V
A
- C
lass 1 accu
racy o
r b
et
ter
NO
Sec
tion of
C
T c
abl
es
:
2.
5
m
m
²? (
rec
om
m
ended)
D
et
er
m
ine t
he l
engt
h of
C
T c
abl
es
(m
et
er
s)
L =
…
m
X3 =
(L x
0.
007 x
25)
+
10
X3
=
…
V
A
Sel
ec
t 3 i
dent
ic
al
CT
’s
s
uc
h t
hat
:
-
rat
in
g at
p
rim
ar
y
≥
X
2
- r
at
in
g at
seco
nd
ar
y:
5A
- B
ur
de
n
≥
X
3 V
A
- C
lass 1 accu
racy o
r b
et
ter
D
et
er
m
ine t
he l
engt
h (
m
) and
res
is
tanc
e (
Ω
/m
)of
C
T c
abl
es
(m
et
er
s)
L =
…
m
R
=
…
Ω
/m
X4 =
(L x
R
x
25)
+
10
X4
=
…
V
A
Sel
ec
t 3 i
dent
ic
al
CT
’s
s
uc
h t
hat
:
-
rat
in
g at
p
rim
ar
y
≥
X
2
- r
at
in
g at
seco
nd
ar
y:
5A
- B
ur
de
n
≥
X
4 V
A
- C
lass 1 accu
racy o
r b
et
ter
NO
YE
S
YE
S
Figure 32: Flow chart for CT determination