jica · 2008. 10. 28. · step a (type-3) power system analysis for step a - power system analysis...
TRANSCRIPT
-
Power System Analysis
- Ashanti 11kV -
-
Step A (Type-3)
Pow
er S
yste
m A
naly
sis
for S
tep
A -
Pow
er S
yste
m A
naly
sis
for e
xist
ing
syst
em u
sing
Mac
ro d
eman
d fo
reca
st -
No.
7N
o.7
No.
7
→I m
axR
T1
=5.6Ω
XT1
=7.2Ω
RT2
=1.9Ω
XT2
=2.4Ω
RB
2=2
.8Ω
XB
2=3
.6Ω
Trun
k Li
ne 1
Trun
k Li
ne 2
Bra
nch
Line
2
RB
1=2
.8Ω
XB
1=3
.6Ω
RB
3=3
.8Ω
XB
3=5
.0Ω
Bra
nch
Line
1B
ranc
h Li
ne 3
No.
7N
o.7
====
=Equ
atio
n===
==V
i1 =
Vs
- 1.7
32・(R
T1co
sθ +
XT1
sinθ
)・(L
T1・f T
1 + L
T2 +
LB
1 +
L B2 +
L B3)
Vi2 =
Vi1
- 1.
732・
(RT2
cosθ
+ X
T2si
nθ)・
(LT2
・f T
2 + L
B2 +
L B3)
Vr1
= V
i1 -
1.73
2・L B
1(R
B1c
osθ
+ X
B1s
inθ
)・f B
1
Vr2
= V
i2 -
1.73
2・L B
2(R
B2c
osθ
+ X
B2s
inθ
)・f B
2
Vr3
= V
i2 -
1.73
2・L B
3(R
B3c
osθ
+ X
B3s
inθ
)・f B
3
LT1
= I
max
・C
AP
T1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LT2
= I
max
・C
AP
T2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
1 =
Im
ax・C
AP
B1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
2 =
Im
ax・C
AP
B2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
3 =
Im
ax・C
AP
B3／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
I max
= L
T1
+ L
T2
+ L
B1 +
LB
2 +
LB
3
Vs
: Sup
ply
Vol
tage
I max
: Max
imum
Cur
rent
: Res
ista
nce
Vi1
: Int
erim
Vol
tage
L T1
: Loa
d (T
runk
line
1)
: Rea
ctan
ceV
i2: I
nter
im V
olta
geL T
2: L
oad
(Tru
nk li
ne 2
)f T
1, f T
2, f B
1, f B
2, f B
3
Vr1
L B1
: Loa
d (B
ranc
h Li
ne 1
)V
r2L B
2: L
oad
(Bra
nch
Line
2)
Vr3
L B3
: Loa
d (B
ranc
h Li
ne 3
)co
sθ: P
ower
Fac
tor
: Dis
pers
al L
oad
Fact
or
: Tot
al T
rans
form
er C
apac
ity o
f sec
onda
ry s
ubst
atio
ns
Type
of D
istri
bute
d Lo
adE
qual
ityTo
tal T
rans
form
erC
apac
ity o
f sec
onda
rysu
bsta
tions
CA
P T2
1115
kVA
L B1 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
5AA
AC
120m
m2
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
1
300k
VA
AA
C12
0mm
2
Type
of D
istri
bute
d Lo
adE
qual
ityLi
ne L
engt
h Le
n B1
10.1
km
Vol
tage
Vr2
9.3k
V(1
5%D
rop)
Load
ing
8%R
ated
Cur
rent
=455
A
Max
imum
L T1
(Dis
tribu
ted
Load
)
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP T
1
1150
kVA
L B2 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
Pow
er fa
ctor
Loading
Load
LB
1
Sub
stat
ion
Nam
eK
ON
ON
GO
Feed
er N
ame
AG
OG
O
Load
ing
Type
-3
Cur
rent
I max
95.0
A
Load
LT1
Type
of D
istri
bute
d Lo
ad
Line
Typ
e21
AA
AC
120m
m2
Mid
dle
Larg
erLi
ne L
egth
Len
T26.
8km
Line
Typ
e
Vol
tage
Vi1
9.7k
VR
ated
Cur
rent
21%
9.7k
V(1
2%D
rop)
Vol
tage
Vr1
1%
Line
Typ
eA
AC
120m
m2
0.85
Line
Leg
th L
enT1
20.3
km
(cosθ)
(11%
Dro
p)=4
55A
Vol
tage
VS
11.0
kV
Mid
dle
Sm
alle
r
Line
Len
gth
Len B
110
.1km
Line
Typ
e
Type
of D
istri
bute
d Lo
ad
: Inp
ut d
ata
in c
olor
ed c
ells
=455
A
Rat
ed C
urre
nt=4
55A
Load
LB
237
A
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
2
2050
kVA
Load
LT2
20A
L T2
(Dis
tribu
ted
Load
)
Loading
15%
Rat
ed C
urre
nt
Vol
tage
Vi2
9.5k
V(1
4%D
rop)
Load
ing
L B3 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
AA
C12
0mm
2
Type
of D
istri
bute
d Lo
adM
iddl
e La
rger
Load
LB
3
Line
Len
gth
Len B
313
.9km
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
3
600k
VA
Vol
tage
Vr3
9.4k
V(1
5%D
rop)
2%R
ated
Cur
rent
=455
A
11A
Line
Typ
e
: Rec
eive
d V
olta
ge
RT1
, RT2
, RB
1, R
B2,
RB
3
X T1,
X T2,
X B1,
X B2,
X B3
CA
PB
2, C
AP
B3
CA
P T1,
CA
PT2
, CA
PB
1: R
ecei
ved
Vol
tage
: Rec
eive
d V
olta
ge
Prim
ary
Sub
stat
ion
JICA
Stu
dy o
n "P
ower
Dis
trib
utio
n Sy
stem
MAs
ter
Plan
Stu
dy f
or Gha
na"
-
Step A (Type-3)
Pow
er S
yste
m A
naly
sis
for S
tep
A -
Pow
er S
yste
m A
naly
sis
for e
xist
ing
syst
em u
sing
Mac
ro d
eman
d fo
reca
st -
No.
7N
o.7
No.
7
→I m
axR
T1
=1.1Ω
XT1
=1.4Ω
RT2
=1.4Ω
XT2
=1.8Ω
RB
2=1
.3Ω
XB
2=1
.6Ω
Trun
k Li
ne 1
Trun
k Li
ne 2
Bra
nch
Line
2
RB
1=1
.5Ω
XB
1=1
.9Ω
RB
3=1
.0Ω
XB
3=1
.4Ω
Bra
nch
Line
1B
ranc
h Li
ne 3
No.
7N
o.7
====
=Equ
atio
n===
==V
i1 =
Vs
- 1.7
32・(R
T1co
sθ +
XT1
sinθ
)・(L
T1・f T
1 + L
T2 +
LB
1 +
L B2 +
L B3)
Vi2 =
Vi1
- 1.
732・
(RT2
cosθ
+ X
T2si
nθ)・
(LT2
・f T
2 + L
B2 +
L B3)
Vr1
= V
i1 -
1.73
2・L B
1(R
B1c
osθ
+ X
B1s
inθ
)・f B
1
Vr2
= V
i2 -
1.73
2・L B
2(R
B2c
osθ
+ X
B2s
inθ
)・f B
2
Vr3
= V
i2 -
1.73
2・L B
3(R
B3c
osθ
+ X
B3s
inθ
)・f B
3
LT1
= I
max
・C
AP
T1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LT2
= I
max
・C
AP
T2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
1 =
Im
ax・C
AP
B1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
2 =
Im
ax・C
AP
B2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
3 =
Im
ax・C
AP
B3／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
I max
= L
T1
+ L
T2
+ L
B1 +
LB
2 +
LB
3
Vs
: Sup
ply
Vol
tage
I max
: Max
imum
Cur
rent
: Res
ista
nce
Vi1
: Int
erim
Vol
tage
L T1
: Loa
d (T
runk
line
1)
: Rea
ctan
ceV
i2: I
nter
im V
olta
geL T
2: L
oad
(Tru
nk li
ne 2
)f T
1, f T
2, f B
1, f B
2, f B
3
Vr1
L B1
: Loa
d (B
ranc
h Li
ne 1
)V
r2L B
2: L
oad
(Bra
nch
Line
2)
Vr3
L B3
: Loa
d (B
ranc
h Li
ne 3
)co
sθ: P
ower
Fac
tor
: Dis
pers
al L
oad
Fact
or
: Tot
al T
rans
form
er C
apac
ity o
f sec
onda
ry s
ubst
atio
ns
Type
of D
istri
bute
d Lo
adE
qual
ityTo
tal T
rans
form
erC
apac
ity o
f sec
onda
rysu
bsta
tions
CA
P T2
5330
kVA
L B1 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
113A
AA
C12
0mm
2
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
1
3740
kVA
AA
C12
0mm
2
Type
of D
istri
bute
d Lo
adS
endi
ng L
arge
r
Line
Len
gth
Len B
14.
6km
Vol
tage
Vr2
9.6k
V(1
3%D
rop)
Load
ing
3%R
ated
Cur
rent
=455
A
Max
imum
L T1
(Dis
tribu
ted
Load
)
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP T
1
2030
kVA
L B2 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
Pow
er fa
ctor
Loading
Load
LB
1
Sub
stat
ion
Nam
eM
AIN
CFe
eder
Nam
eA
IRP
OR
T 1
Load
ing
Type
-3
Cur
rent
I max
365.
0A
Load
LT1
Type
of D
istri
bute
d Lo
ad
Line
Typ
e61
AA
AC
120m
m2
Equ
ality
Line
Leg
th L
enT2
5.1k
mLi
ne T
ype
Vol
tage
Vi1
10.0
kVR
ated
Cur
rent
80%
9.8k
V(1
1%D
rop)
Vol
tage
Vr1
25%
Line
Typ
eA
AC
120m
m2
0.82
Line
Leg
th L
enT1
4.0k
m
(cosθ)
(9%
Dro
p)=4
55A
Vol
tage
VS
11.0
kV
Mid
dle
Larg
er
Line
Len
gth
Len B
15.
4km
Line
Typ
e
Type
of D
istri
bute
d Lo
ad
: Inp
ut d
ata
in c
olor
ed c
ells
=455
A
Rat
ed C
urre
nt=4
55A
Load
LB
214
A
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
2
450k
VA
Load
LT2
161A
L T2
(Dis
tribu
ted
Load
)
Loading
42%
Rat
ed C
urre
nt
Vol
tage
Vi2
9.6k
V(1
3%D
rop)
Load
ing
L B3 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
AA
C12
0mm
2
Type
of D
istri
bute
d Lo
adE
qual
ity
Load
LB
3
Line
Len
gth
Len B
33.
8km
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
3
500k
VA
Vol
tage
Vr3
9.6k
V(1
3%D
rop)
3%R
ated
Cur
rent
=455
A
15A
Line
Typ
e
: Rec
eive
d V
olta
ge
RT1
, RT2
, RB
1, R
B2,
RB
3
X T1,
X T2,
X B1,
X B2,
X B3
CA
PB
2, C
AP
B3
CA
P T1,
CA
PT2
, CA
PB
1: R
ecei
ved
Vol
tage
: Rec
eive
d V
olta
ge
Prim
ary
Sub
stat
ion
JICA
Stu
dy o
n "P
ower
Dis
trib
utio
n Sy
stem
MAs
ter
Plan
Stu
dy f
or Gha
na"
-
Step A (Type-3)
Pow
er S
yste
m A
naly
sis
for S
tep
A -
Pow
er S
yste
m A
naly
sis
for e
xist
ing
syst
em u
sing
Mac
ro d
eman
d fo
reca
st -
No.
7N
o.7
No.
7
→I m
axR
T1
=1.0Ω
XT1
=1.2Ω
RT2
=1.8Ω
XT2
=2.3Ω
RB
2=1
.0Ω
XB
2=1
.4Ω
Trun
k Li
ne 1
Trun
k Li
ne 2
Bra
nch
Line
2
RB
1=.
6ΩX
B1
=.8Ω
RB
3=.
4ΩX
B3
=.5Ω
Bra
nch
Line
1B
ranc
h Li
ne 3
No.
7N
o.7
====
=Equ
atio
n===
==V
i1 =
Vs
- 1.7
32・(R
T1co
sθ +
XT1
sinθ
)・(L
T1・f T
1 + L
T2 +
LB
1 +
L B2 +
L B3)
Vi2 =
Vi1
- 1.
732・
(RT2
cosθ
+ X
T2si
nθ)・
(LT2
・f T
2 + L
B2 +
L B3)
Vr1
= V
i1 -
1.73
2・L B
1(R
B1c
osθ
+ X
B1s
inθ
)・f B
1
Vr2
= V
i2 -
1.73
2・L B
2(R
B2c
osθ
+ X
B2s
inθ
)・f B
2
Vr3
= V
i2 -
1.73
2・L B
3(R
B3c
osθ
+ X
B3s
inθ
)・f B
3
LT1
= I
max
・C
AP
T1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LT2
= I
max
・C
AP
T2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
1 =
Im
ax・C
AP
B1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
2 =
Im
ax・C
AP
B2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
3 =
Im
ax・C
AP
B3／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
I max
= L
T1
+ L
T2
+ L
B1 +
LB
2 +
LB
3
Vs
: Sup
ply
Vol
tage
I max
: Max
imum
Cur
rent
: Res
ista
nce
Vi1
: Int
erim
Vol
tage
L T1
: Loa
d (T
runk
line
1)
: Rea
ctan
ceV
i2: I
nter
im V
olta
geL T
2: L
oad
(Tru
nk li
ne 2
)f T
1, f T
2, f B
1, f B
2, f B
3
Vr1
L B1
: Loa
d (B
ranc
h Li
ne 1
)V
r2L B
2: L
oad
(Bra
nch
Line
2)
Vr3
L B3
: Loa
d (B
ranc
h Li
ne 3
)co
sθ: P
ower
Fac
tor
: Dis
pers
al L
oad
Fact
or
: Tot
al T
rans
form
er C
apac
ity o
f sec
onda
ry s
ubst
atio
ns
Type
of D
istri
bute
d Lo
adR
ecei
ved
Larg
er
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP T
2
6425
kVA
L B1 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
44A
AA
C12
0mm
2
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
1
1365
kVA
AA
C12
0mm
2
Type
of D
istri
bute
d Lo
adE
qual
ityLi
ne L
engt
h Le
n B1
3.8k
m
Vol
tage
Vr2
9.0k
V(1
8%D
rop)
Load
ing
9%R
ated
Cur
rent
=455
A
Max
imum
L T1
(Dis
tribu
ted
Load
)
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP T
1
2600
kVA
L B2 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
Pow
er fa
ctor
Loading
Load
LB
1
Sub
stat
ion
Nam
eM
AIN
CFe
eder
Nam
eA
IRP
OR
T 2
Load
ing
Type
-3
Cur
rent
I max
405.
0A
Load
LT1
Type
of D
istri
bute
d Lo
ad
Line
Typ
e84
AA
AC
120m
m2
Equ
ality
Line
Leg
th L
enT2
6.5k
mLi
ne T
ype
Vol
tage
Vi1
10.1
kVR
ated
Cur
rent
89%
10.0
kV(9
%D
rop)
Vol
tage
Vr1
10%
Line
Typ
eA
AC
120m
m2
0.82
Line
Leg
th L
enT1
3.5k
m
(cosθ)
(9%
Dro
p)=4
55A
Vol
tage
VS
11.0
kV
Equ
ality
Line
Len
gth
Len B
12.
2km
Line
Typ
e
Type
of D
istri
bute
d Lo
ad
: Inp
ut d
ata
in c
olor
ed c
ells
=455
A
Rat
ed C
urre
nt=4
55A
Load
LB
239
A
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
2
1215
kVA
Load
LT2
206A
L T2
(Dis
tribu
ted
Load
)
Loading
61%
Rat
ed C
urre
nt
Vol
tage
Vi2
9.0k
V(1
8%D
rop)
Load
ing
L B3 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
AA
C12
0mm
2
Type
of D
istri
bute
d Lo
adE
qual
ity
Load
LB
3
Line
Len
gth
Len B
31.
3km
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
3
1000
kVA
Vol
tage
Vr3
9.0k
V(1
8%D
rop)
7%R
ated
Cur
rent
=455
A
32A
Line
Typ
e
: Rec
eive
d V
olta
ge
RT1
, RT2
, RB
1, R
B2,
RB
3
X T1,
X T2,
X B1,
X B2,
X B3
CA
PB
2, C
AP
B3
CA
P T1,
CA
PT2
, CA
PB
1: R
ecei
ved
Vol
tage
: Rec
eive
d V
olta
ge
Prim
ary
Sub
stat
ion
JICA
Stu
dy o
n "P
ower
Dis
trib
utio
n Sy
stem
MAs
ter
Plan
Stu
dy f
or Gha
na"
-
Step A (Type-3)
Pow
er S
yste
m A
naly
sis
for S
tep
A -
Pow
er S
yste
m A
naly
sis
for e
xist
ing
syst
em u
sing
Mac
ro d
eman
d fo
reca
st -
No.
24N
o.7
No.
7
→I m
axR
T1
=.2Ω
XT1
=.1Ω
RT2
=.7Ω
XT2
=.9Ω
RB
2=.
9ΩX
B2
=1.1Ω
Trun
k Li
ne 1
Trun
k Li
ne 2
Bra
nch
Line
2
RB
1=.
4ΩX
B1
=.5Ω
RB
3=.
8ΩX
B3
=1.0Ω
Bra
nch
Line
1B
ranc
h Li
ne 3
No.
7N
o.7
====
=Equ
atio
n===
==V
i1 =
Vs
- 1.7
32・(R
T1co
sθ +
XT1
sinθ
)・(L
T1・f T
1 + L
T2 +
LB
1 +
L B2 +
L B3)
Vi2 =
Vi1
- 1.
732・
(RT2
cosθ
+ X
T2si
nθ)・
(LT2
・f T
2 + L
B2 +
L B3)
Vr1
= V
i1 -
1.73
2・L B
1(R
B1c
osθ
+ X
B1s
inθ
)・f B
1
Vr2
= V
i2 -
1.73
2・L B
2(R
B2c
osθ
+ X
B2s
inθ
)・f B
2
Vr3
= V
i2 -
1.73
2・L B
3(R
B3c
osθ
+ X
B3s
inθ
)・f B
3
LT1
= I
max
・C
AP
T1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LT2
= I
max
・C
AP
T2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
1 =
Im
ax・C
AP
B1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
2 =
Im
ax・C
AP
B2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
3 =
Im
ax・C
AP
B3／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
I max
= L
T1
+ L
T2
+ L
B1 +
LB
2 +
LB
3
Vs
: Sup
ply
Vol
tage
I max
: Max
imum
Cur
rent
: Res
ista
nce
Vi1
: Int
erim
Vol
tage
L T1
: Loa
d (T
runk
line
1)
: Rea
ctan
ceV
i2: I
nter
im V
olta
geL T
2: L
oad
(Tru
nk li
ne 2
)f T
1, f T
2, f B
1, f B
2, f B
3
Vr1
L B1
: Loa
d (B
ranc
h Li
ne 1
)V
r2L B
2: L
oad
(Bra
nch
Line
2)
Vr3
L B3
: Loa
d (B
ranc
h Li
ne 3
)co
sθ: P
ower
Fac
tor
: Rec
eive
d V
olta
ge
RT1
, RT2
, RB
1, R
B2,
RB
3
X T1,
X T2,
X B1,
X B2,
X B3
CA
PB
2, C
AP
B3
CA
P T1,
CA
PT2
, CA
PB
1: R
ecei
ved
Vol
tage
: Rec
eive
d V
olta
ge
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
3
1350
kVA
Vol
tage
Vr3
10.5
kV(4
%D
rop)
13%
Rat
ed C
urre
nt=4
55A
61A
Line
Typ
eA
AC
120m
m2
Type
of D
istri
bute
d Lo
adR
ecei
ved
Larg
er
Load
LB
3
Line
Len
gth
Len B
32.
8km
Vol
tage
Vi2
10.6
kV(4
%D
rop)
Load
ing
L B3 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
L T2
(Dis
tribu
ted
Load
)
Loading
74%
Rat
ed C
urre
nt
: Inp
ut d
ata
in c
olor
ed c
ells
=335
A
Rat
ed C
urre
nt=4
55A
Load
LB
255
A
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
2
1230
kVA
Load
LT2
132A
Rec
eive
d La
rger
Line
Len
gth
Len B
11.
4km
Line
Typ
e
Type
of D
istri
bute
d Lo
ad
Line
Typ
eA
AC
120m
m2
0.97
Line
Leg
th L
enT1
1.1k
m
(cosθ)
(1%
Dro
p)=4
55A
Vol
tage
VS
11.0
kV
10.9
kV(1
%D
rop)
Vol
tage
Vr1
13%
Vol
tage
Vi1
10.9
kVR
ated
Cur
rent
100%
Load
LT1
Type
of D
istri
bute
d Lo
ad
Line
Typ
e28
A18
5ALX
PLE
(11k
V)
Equ
ality
Line
Leg
th L
enT2
2.6k
mLi
ne T
ype
Loading
Load
LB
1
Sub
stat
ion
Nam
eM
AIN
B
Feed
er N
ame
B 1
1
Load
ing
Type
-3
Cur
rent
I max
335.
0A
L B2 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
Pow
er fa
ctor
Max
imum
L T1
(Dis
tribu
ted
Load
)
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP T
1
630k
VA
Vol
tage
Vr2
10.6
kV(4
%D
rop)
Load
ing
12%
Rat
ed C
urre
nt=4
55A
AA
C12
0mm
2
Type
of D
istri
bute
d Lo
adE
qual
ityLi
ne L
engt
h Le
n B1
3.1k
m
: Tot
al T
rans
form
er C
apac
ity o
f sec
onda
ry s
ubst
atio
ns
Type
of D
istri
bute
d Lo
adE
qual
ityTo
tal T
rans
form
erC
apac
ity o
f sec
onda
rysu
bsta
tions
CA
P T2
2945
kVA
L B1 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
59A
AA
C12
0mm
2
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
1
1315
kVA
: Dis
pers
al L
oad
Fact
or
Prim
ary
Sub
stat
ion
JICA
Stu
dy o
n "P
ower
Dis
trib
utio
n Sy
stem
MAs
ter
Plan
Stu
dy f
or Gha
na"
-
Step A (Type-3)
Pow
er S
yste
m A
naly
sis
for S
tep
A -
Pow
er S
yste
m A
naly
sis
for e
xist
ing
syst
em u
sing
Mac
ro d
eman
d fo
reca
st -
No.
24N
o.24
No.
7
→I m
axR
T1
=.3Ω
XT1
=.3Ω
RT2
=.1Ω
XT2
=.1Ω
RB
2=.
5ΩX
B2
=.6Ω
Trun
k Li
ne 1
Trun
k Li
ne 2
Bra
nch
Line
2
RB
1=.
0ΩX
B1
=.0Ω
RB
3=.
0ΩX
B3
=.0Ω
Bra
nch
Line
1B
ranc
h Li
ne 3
No.
24N
o.33
====
=Equ
atio
n===
==V
i1 =
Vs
- 1.7
32・(R
T1co
sθ +
XT1
sinθ
)・(L
T1・f T
1 + L
T2 +
LB
1 +
L B2 +
L B3)
Vi2 =
Vi1
- 1.
732・
(RT2
cosθ
+ X
T2si
nθ)・
(LT2
・f T
2 + L
B2 +
L B3)
Vr1
= V
i1 -
1.73
2・L B
1(R
B1c
osθ
+ X
B1s
inθ
)・f B
1
Vr2
= V
i2 -
1.73
2・L B
2(R
B2c
osθ
+ X
B2s
inθ
)・f B
2
Vr3
= V
i2 -
1.73
2・L B
3(R
B3c
osθ
+ X
B3s
inθ
)・f B
3
LT1
= I
max
・C
AP
T1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LT2
= I
max
・C
AP
T2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
1 =
Im
ax・C
AP
B1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
2 =
Im
ax・C
AP
B2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
3 =
Im
ax・C
AP
B3／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
I max
= L
T1
+ L
T2
+ L
B1 +
LB
2 +
LB
3
Vs
: Sup
ply
Vol
tage
I max
: Max
imum
Cur
rent
: Res
ista
nce
Vi1
: Int
erim
Vol
tage
L T1
: Loa
d (T
runk
line
1)
: Rea
ctan
ceV
i2: I
nter
im V
olta
geL T
2: L
oad
(Tru
nk li
ne 2
)f T
1, f T
2, f B
1, f B
2, f B
3
Vr1
L B1
: Loa
d (B
ranc
h Li
ne 1
)V
r2L B
2: L
oad
(Bra
nch
Line
2)
Vr3
L B3
: Loa
d (B
ranc
h Li
ne 3
)co
sθ: P
ower
Fac
tor
: Dis
pers
al L
oad
Fact
or
: Tot
al T
rans
form
er C
apac
ity o
f sec
onda
ry s
ubst
atio
ns
Type
of D
istri
bute
d Lo
adE
qual
ityTo
tal T
rans
form
erC
apac
ity o
f sec
onda
rysu
bsta
tions
CA
P T2
1000
kVA
L B1 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
21A
185A
LXP
LE(1
1kV
)
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
1
315k
VA
AA
C12
0mm
2
Type
of D
istri
bute
d Lo
adS
endi
ng L
arge
r
Line
Len
gth
Len B
11.
8km
Vol
tage
Vr2
10.8
kV(1
%D
rop)
Load
ing
15%
Rat
ed C
urre
nt=4
55A
Max
imum
L T1
(Dis
tribu
ted
Load
)
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP T
1
500k
VA
L B2 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
Pow
er fa
ctor
Loading
Load
LB
1
Sub
stat
ion
Nam
eM
AIN
BFe
eder
Nam
eB
21
Load
ing
Type
-3
Cur
rent
I max
190.
0A
Load
LT1
Type
of D
istri
bute
d Lo
ad
Line
Typ
e34
A18
5ALX
PLE
(11k
V)
Mid
dle
Larg
erLi
ne L
egth
Len
T2.4
kmLi
ne T
ype
Vol
tage
Vi1
10.9
kVR
ated
Cur
rent
57%
10.9
kV(1
%D
rop)
Vol
tage
Vr1
6%
Line
Typ
e18
5ALX
PLE
(11k
V)
0.97
Line
Leg
th L
enT1
2.2k
m
(cosθ)
(1%
Dro
p)=3
35A
Vol
tage
VS
11.0
kV
Con
cent
rate
d
Line
Len
gth
Len B
1.2
kmLi
ne T
ype
Type
of D
istri
bute
d Lo
ad
: Inp
ut d
ata
in c
olor
ed c
ells
=335
A
Rat
ed C
urre
nt=3
35A
Load
LB
268
A
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
2
1015
kVA
Load
LT2
67A
L T2
(Dis
tribu
ted
Load
)
Loading
40%
Rat
ed C
urre
nt
Vol
tage
Vi2
10.9
kV(1
%D
rop)
Load
ing
L B3 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
Non
e
Type
of D
istri
bute
d Lo
adE
qual
ity
Load
LB
3
Line
Len
gth
Len B
3.0
km
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
3
kVA
Vol
tage
Vr3
10.9
kV(1
%D
rop)
#DIV
/0!
Rat
ed C
urre
nt=A
ALi
ne T
ype
: Rec
eive
d V
olta
ge
RT1
, RT2
, RB
1, R
B2,
RB
3
X T1,
X T2,
X B1,
X B2,
X B3
CA
PB
2, C
AP
B3
CA
P T1,
CA
PT2
, CA
PB
1: R
ecei
ved
Vol
tage
: Rec
eive
d V
olta
ge
Prim
ary
Sub
stat
ion
JICA
Stu
dy o
n "P
ower
Dis
trib
utio
n Sy
stem
MAs
ter
Plan
Stu
dy f
or Gha
na"
-
Step A (Type-2)
Pow
er S
yste
m A
naly
sis
for S
tep
A -
Pow
er S
yste
m A
naly
sis
for e
xist
ing
syst
em u
sing
Mac
ro d
eman
d fo
reca
st -
No.
24N
o.24
→I m
axR
T=.
1ΩX
T=.
1ΩR
B1
=.3Ω
XB
1=.
3ΩTr
unk
Line
Bra
nch
Line
1
RB
2=.
4ΩX
B2
=.2Ω
====
=Equ
atio
n===
==B
ranc
h Li
ne 2
V i =
Vs
- 1.7
32・(R
Tcos
θ +
XTs
inθ
)(L T
・f T
+ (L
B1+
L B2)
)V r
1 = V
i - 1
.732
・L B
1(R
B1c
osθ
+ X
B1s
inθ
)・f B
1
V r2 =
Vi -
1.7
32・L B
2(R
B2c
osθ
+ X
B2s
inθ
)・f B
2
L
T =
Im
ax・C
AP
T／
(CA
PT+C
AP
B1+C
AP
B2)
LB
1 =
Im
ax・C
AP
B1／
(CA
PT+C
AP
B1+C
AP
B2)
No.
11L
B2 =
Im
ax・C
AP
B2／
(CA
PT+C
AP
B1+C
AP
B2)
I max
= L
T +
LB
1 +
LB
2
V s: S
uppl
y V
olta
geI m
ax: M
axim
um C
urre
nt: R
esis
tanc
eV i
: Int
erim
Vol
tage
L T: L
oad
(Tru
nk li
ne)
: Rea
ctan
ceV r
1L B
1: L
oad
(Bra
nch
Line
1)
cosθ
: Pow
er F
acto
rV r
2L B
2: L
oad
(Bra
nch
Line
2)
f T, f
B1,
f B2
: Inp
ut d
ata
in c
olor
ed c
ells
=335
A
Rat
ed C
urre
nt=3
35A
Line
Len
gth
Len B
12.
3km
Line
Typ
e
Type
of D
istri
bute
d Lo
ad
60A
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
1
1600
kVA
Load
LB
218
A
Load
ing
L B1 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
L B2 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
.8km
(cosθ)
Vol
tage
VS
11.0
kVR
ated
Cur
rent
32%
Loading
L T (D
istri
bute
d Lo
ad)
Load
LT
Type
of D
istri
bute
d Lo
ad
Line
Typ
e30
A18
5ALX
PLE
(11k
V)
Sen
ding
Lar
ger
Equ
ality
Load
LB
1
185A
LXP
LE(1
1kV
)
Pow
er fa
ctor
Max
imum
Sub
stat
ion
Nam
eM
AIN
BFe
eder
Nam
eB
31
0.97
Line
Leg
th L
enT
Type
-2
Cur
rent
I max
107.
0ATo
tal T
rans
form
erC
apac
ity o
f sec
onda
rysu
bsta
tions
CA
P T80
0kV
A
: Rec
eive
d V
olta
ge: R
ecei
ved
Vol
tage
RT,
RB
1, R
B2
XT,
XB
1, X
B2
11.0
kV(0
%D
rop)
Line
Typ
eA
AC
50m
m2
(0%
Dro
p)11
.0kV : D
ispe
rsal
Loa
d Fa
ctor
Vol
tage
Vr1
18%
Vol
tage
Vi
(0%
Dro
p)
Load
ing
7%R
ated
Cur
rent
=260
AV
olta
ge V
r2
11.0
kV
: Tot
al T
rans
form
er C
apac
ity o
f sec
onda
ry s
ubst
atio
ns
Line
Len
gth
Len B
1.6
km
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
2
475k
VA
CA
PT,
CA
P B1,
CA
P B2
Type
of D
istri
bute
d Lo
adS
endi
ng L
arge
r
Prim
ary
Sub
stat
ion
JICA Study on "Power Distribution System Master Plan Study for G
hana"
-
Step A (Type-3)
Pow
er S
yste
m A
naly
sis
for S
tep
A -
Pow
er S
yste
m A
naly
sis
for e
xist
ing
syst
em u
sing
Mac
ro d
eman
d fo
reca
st -
No.
24N
o.24
No.
24
→I m
axR
T1
=.1Ω
XT1
=.1Ω
RT2
=.0Ω
XT2
=.0Ω
RB
2=.
3ΩX
B2
=.2Ω
Trun
k Li
ne 1
Trun
k Li
ne 2
Bra
nch
Line
2
RB
1=.
1ΩX
B1
=.1Ω
RB
3=.
1ΩX
B3
=.1Ω
Bra
nch
Line
1B
ranc
h Li
ne 3
No.
24N
o.7
====
=Equ
atio
n===
==V
i1 =
Vs
- 1.7
32・(R
T1co
sθ +
XT1
sinθ
)・(L
T1・f T
1 + L
T2 +
LB
1 +
L B2 +
L B3)
Vi2 =
Vi1
- 1.
732・
(RT2
cosθ
+ X
T2si
nθ)・
(LT2
・f T
2 + L
B2 +
L B3)
Vr1
= V
i1 -
1.73
2・L B
1(R
B1c
osθ
+ X
B1s
inθ
)・f B
1
Vr2
= V
i2 -
1.73
2・L B
2(R
B2c
osθ
+ X
B2s
inθ
)・f B
2
Vr3
= V
i2 -
1.73
2・L B
3(R
B3c
osθ
+ X
B3s
inθ
)・f B
3
LT1
= I
max
・C
AP
T1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LT2
= I
max
・C
AP
T2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
1 =
Im
ax・C
AP
B1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
2 =
Im
ax・C
AP
B2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
3 =
Im
ax・C
AP
B3／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
I max
= L
T1
+ L
T2
+ L
B1 +
LB
2 +
LB
3
Vs
: Sup
ply
Vol
tage
I max
: Max
imum
Cur
rent
: Res
ista
nce
Vi1
: Int
erim
Vol
tage
L T1
: Loa
d (T
runk
line
1)
: Rea
ctan
ceV
i2: I
nter
im V
olta
geL T
2: L
oad
(Tru
nk li
ne 2
)f T
1, f T
2, f B
1, f B
2, f B
3
Vr1
L B1
: Loa
d (B
ranc
h Li
ne 1
)V
r2L B
2: L
oad
(Bra
nch
Line
2)
Vr3
L B3
: Loa
d (B
ranc
h Li
ne 3
)co
sθ: P
ower
Fac
tor
: Dis
pers
al L
oad
Fact
or
: Tot
al T
rans
form
er C
apac
ity o
f sec
onda
ry s
ubst
atio
ns
Type
of D
istri
bute
d Lo
adE
qual
ityTo
tal T
rans
form
erC
apac
ity o
f sec
onda
rysu
bsta
tions
CA
P T2
kVA
L B1 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
13A
185A
LXP
LE(1
1kV
)
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
1
500k
VA
185A
LXP
LE(1
1kV
)
Type
of D
istri
bute
d Lo
adR
ecei
ved
Larg
er
Line
Len
gth
Len B
11.
7km
Vol
tage
Vr2
10.9
kV(1
%D
rop)
Load
ing
24%
Rat
ed C
urre
nt=3
35A
Max
imum
L T1
(Dis
tribu
ted
Load
)
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP T
1
300k
VA
L B2 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
Pow
er fa
ctor
Loading
Load
LB
1
Sub
stat
ion
Nam
eM
AIN
BFe
eder
Nam
eB
41
Load
ing
Type
-3
Cur
rent
I max
110.
0A
Load
LT1
Type
of D
istri
bute
d Lo
ad
Line
Typ
e8 A
185A
LXP
LE(1
1kV
)
Con
cent
rate
dLi
ne L
egth
Len
T2.3
kmLi
ne T
ype
Vol
tage
Vi1
11.0
kVR
ated
Cur
rent
33%
11.0
kV(0
%D
rop)
Vol
tage
Vr1
4%
Line
Typ
e18
5ALX
PLE
(11k
V)
0.97
Line
Leg
th L
enT1
.6km
(cosθ)
(0%
Dro
p)=3
35A
Vol
tage
VS
11.0
kV
Con
cent
rate
d
Line
Len
gth
Len B
1.5
kmLi
ne T
ype
Type
of D
istri
bute
d Lo
ad
: Inp
ut d
ata
in c
olor
ed c
ells
=335
A
Rat
ed C
urre
nt=3
35A
Load
LB
281
A
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
2
3065
kVA
Load
LT2
A
L T2
(Dis
tribu
ted
Load
)
Loading
27%
Rat
ed C
urre
nt
Vol
tage
Vi2
11.0
kV(0
%D
rop)
Load
ing
L B3 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
AA
C12
0mm
2
Type
of D
istri
bute
d Lo
adC
once
ntra
ted
Load
LB
3
Line
Len
gth
Len B
3.4
km
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
3
315k
VA
Vol
tage
Vr3
11.0
kV(0
%D
rop)
2%R
ated
Cur
rent
=455
A
8ALi
ne T
ype
: Rec
eive
d V
olta
ge
RT1
, RT2
, RB
1, R
B2,
RB
3
X T1,
X T2,
X B1,
X B2,
X B3
CA
PB
2, C
AP
B3
CA
P T1,
CA
PT2
, CA
PB
1: R
ecei
ved
Vol
tage
: Rec
eive
d V
olta
ge
Prim
ary
Sub
stat
ion
JICA
Stu
dy o
n "P
ower
Dis
trib
utio
n Sy
stem
MAs
ter
Plan
Stu
dy f
or Gha
na"
-
Step A (Type-3)
Pow
er S
yste
m A
naly
sis
for S
tep
A -
Pow
er S
yste
m A
naly
sis
for e
xist
ing
syst
em u
sing
Mac
ro d
eman
d fo
reca
st -
No.
7N
o.7
No.
7
→I m
axR
T1
=.9Ω
XT1
=1.2Ω
RT2
=.1Ω
XT2
=.1Ω
RB
2=1
.9Ω
XB
2=2
.5Ω
Trun
k Li
ne 1
Trun
k Li
ne 2
Bra
nch
Line
2
RB
1=.
1ΩX
B1
=.1Ω
RB
3=.
1ΩX
B3
=.1Ω
Bra
nch
Line
1B
ranc
h Li
ne 3
No.
24N
o.24
====
=Equ
atio
n===
==V
i1 =
Vs
- 1.7
32・(R
T1co
sθ +
XT1
sinθ
)・(L
T1・f T
1 + L
T2 +
LB
1 +
L B2 +
L B3)
Vi2 =
Vi1
- 1.
732・
(RT2
cosθ
+ X
T2si
nθ)・
(LT2
・f T
2 + L
B2 +
L B3)
Vr1
= V
i1 -
1.73
2・L B
1(R
B1c
osθ
+ X
B1s
inθ
)・f B
1
Vr2
= V
i2 -
1.73
2・L B
2(R
B2c
osθ
+ X
B2s
inθ
)・f B
2
Vr3
= V
i2 -
1.73
2・L B
3(R
B3c
osθ
+ X
B3s
inθ
)・f B
3
LT1
= I
max
・C
AP
T1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LT2
= I
max
・C
AP
T2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
1 =
Im
ax・C
AP
B1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
2 =
Im
ax・C
AP
B2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
3 =
Im
ax・C
AP
B3／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
I max
= L
T1
+ L
T2
+ L
B1 +
LB
2 +
LB
3
Vs
: Sup
ply
Vol
tage
I max
: Max
imum
Cur
rent
: Res
ista
nce
Vi1
: Int
erim
Vol
tage
L T1
: Loa
d (T
runk
line
1)
: Rea
ctan
ceV
i2: I
nter
im V
olta
geL T
2: L
oad
(Tru
nk li
ne 2
)f T
1, f T
2, f B
1, f B
2, f B
3
Vr1
L B1
: Loa
d (B
ranc
h Li
ne 1
)V
r2L B
2: L
oad
(Bra
nch
Line
2)
Vr3
L B3
: Loa
d (B
ranc
h Li
ne 3
)co
sθ: P
ower
Fac
tor
: Dis
pers
al L
oad
Fact
or
: Tot
al T
rans
form
er C
apac
ity o
f sec
onda
ry s
ubst
atio
ns
Type
of D
istri
bute
d Lo
ad
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP T
2
kVA
L B1 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
27A
185A
LXP
LE(1
1kV
)
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
1
630k
VA
AA
C12
0mm
2
Type
of D
istri
bute
d Lo
adE
qual
ityLi
ne L
engt
h Le
n B1
7.1k
m
Vol
tage
Vr2
9.8k
V(1
1%D
rop)
Load
ing
47%
Rat
ed C
urre
nt=4
55A
Max
imum
L T1
(Dis
tribu
ted
Load
)
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP T
1
3160
kVA
L B2 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
Pow
er fa
ctor
Loading
Load
LB
1
Sub
stat
ion
Nam
eM
AIN
BFe
eder
Nam
eB
71
Load
ing
Type
-3
Cur
rent
I max
400.
0A
Load
LT1
Type
of D
istri
bute
d Lo
ad
Line
Typ
e13
4 AA
AC
120m
m2
Mid
dle
Larg
erLi
ne L
egth
Len
T2.4
kmLi
ne T
ype
Vol
tage
Vi1
10.3
kVR
ated
Cur
rent
88%
10.3
kV(6
%D
rop)
Vol
tage
Vr1
8%
Line
Typ
eA
AC
120m
m2
0.97
Line
Leg
th L
enT1
3.3k
m
(cosθ)
(6%
Dro
p)=4
55A
Vol
tage
VS
11.0
kV
Equ
ality
Line
Len
gth
Len B
1.8
kmLi
ne T
ype
Type
of D
istri
bute
d Lo
ad
: Inp
ut d
ata
in c
olor
ed c
ells
=455
A
Rat
ed C
urre
nt=3
35A
Load
LB
221
2A
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
2
4985
kVA
Load
LT2
A
L T2
(Dis
tribu
ted
Load
)
Loading
52%
Rat
ed C
urre
nt
Vol
tage
Vi2
10.3
kV(7
%D
rop)
Load
ing
L B3 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
185A
LXP
LE(1
1kV
)
Type
of D
istri
bute
d Lo
adE
qual
ity
Load
LB
3
Line
Len
gth
Len B
3.7
km
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
3
630k
VA
Vol
tage
Vr3
10.3
kV(7
%D
rop)
8%R
ated
Cur
rent
=335
A
27A
Line
Typ
e
: Rec
eive
d V
olta
ge
RT1
, RT2
, RB
1, R
B2,
RB
3
X T1,
X T2,
X B1,
X B2,
X B3
CA
PB
2, C
AP
B3
CA
P T1,
CA
PT2
, CA
PB
1: R
ecei
ved
Vol
tage
: Rec
eive
d V
olta
ge
Prim
ary
Sub
stat
ion
JICA
Stu
dy o
n "P
ower
Dis
trib
utio
n Sy
stem
MAs
ter
Plan
Stu
dy f
or Gha
na"
-
Step A (Type-3)
Pow
er S
yste
m A
naly
sis
for S
tep
A -
Pow
er S
yste
m A
naly
sis
for e
xist
ing
syst
em u
sing
Mac
ro d
eman
d fo
reca
st -
No.
7N
o.7
No.
7
→I m
axR
T1
=1.1Ω
XT1
=1.4Ω
RT2
=.2Ω
XT2
=.2Ω
RB
2=5
.2Ω
XB
2=6
.7Ω
Trun
k Li
ne 1
Trun
k Li
ne 2
Bra
nch
Line
2
RB
1=.
7ΩX
B1
=.9Ω
RB
3=4
.1Ω
XB
3=5
.3Ω
Bra
nch
Line
1B
ranc
h Li
ne 3
No.
7N
o.7
====
=Equ
atio
n===
==V
i1 =
Vs
- 1.7
32・(R
T1co
sθ +
XT1
sinθ
)・(L
T1・f T
1 + L
T2 +
LB
1 +
L B2 +
L B3)
Vi2 =
Vi1
- 1.
732・
(RT2
cosθ
+ X
T2si
nθ)・
(LT2
・f T
2 + L
B2 +
L B3)
Vr1
= V
i1 -
1.73
2・L B
1(R
B1c
osθ
+ X
B1s
inθ
)・f B
1
Vr2
= V
i2 -
1.73
2・L B
2(R
B2c
osθ
+ X
B2s
inθ
)・f B
2
Vr3
= V
i2 -
1.73
2・L B
3(R
B3c
osθ
+ X
B3s
inθ
)・f B
3
LT1
= I
max
・C
AP
T1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LT2
= I
max
・C
AP
T2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
1 =
Im
ax・C
AP
B1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
2 =
Im
ax・C
AP
B2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
3 =
Im
ax・C
AP
B3／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
I max
= L
T1
+ L
T2
+ L
B1 +
LB
2 +
LB
3
Vs
: Sup
ply
Vol
tage
I max
: Max
imum
Cur
rent
: Res
ista
nce
Vi1
: Int
erim
Vol
tage
L T1
: Loa
d (T
runk
line
1)
: Rea
ctan
ceV
i2: I
nter
im V
olta
geL T
2: L
oad
(Tru
nk li
ne 2
)f T
1, f T
2, f B
1, f B
2, f B
3
Vr1
L B1
: Loa
d (B
ranc
h Li
ne 1
)V
r2L B
2: L
oad
(Bra
nch
Line
2)
Vr3
L B3
: Loa
d (B
ranc
h Li
ne 3
)co
sθ: P
ower
Fac
tor
: Dis
pers
al L
oad
Fact
or
: Tot
al T
rans
form
er C
apac
ity o
f sec
onda
ry s
ubst
atio
ns
Type
of D
istri
bute
d Lo
adC
once
ntra
ted
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP T
2
880k
VA
L B1 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
53A
AA
C12
0mm
2
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
1
1500
kVA
AA
C12
0mm
2
Type
of D
istri
bute
d Lo
adS
endi
ng L
arge
r
Line
Len
gth
Len B
118
.8km
Vol
tage
Vr2
10.0
kV(9
%D
rop)
Load
ing
18%
Rat
ed C
urre
nt=4
55A
Max
imum
L T1
(Dis
tribu
ted
Load
)
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP T
1
4010
kVA
L B2 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
Pow
er fa
ctor
Loading
Load
LB
1
Sub
stat
ion
Nam
eM
AIN
BFe
eder
Nam
eB
61
Load
ing
Type
-3
Cur
rent
I max
344.
0A
Load
LT1
Type
of D
istri
bute
d Lo
ad
Line
Typ
e14
3 AA
AC
120m
m2
Equ
ality
Line
Leg
th L
enT2
.7km
Line
Typ
e
Vol
tage
Vi1
10.4
kVR
ated
Cur
rent
76%
10.3
kV(6
%D
rop)
Vol
tage
Vr1
12%
Line
Typ
eA
AC
120m
m2
0.97
Line
Leg
th L
enT1
3.9k
m
(cosθ)
(6%
Dro
p)=4
55A
Vol
tage
VS
11.0
kV
Equ
ality
Line
Len
gth
Len B
12.
4km
Line
Typ
e
Type
of D
istri
bute
d Lo
ad
: Inp
ut d
ata
in c
olor
ed c
ells
=455
A
Rat
ed C
urre
nt=4
55A
Load
LB
281
A
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
2
2270
kVA
Load
LT2
31A
L T2
(Dis
tribu
ted
Load
)
Loading
32%
Rat
ed C
urre
nt
Vol
tage
Vi2
10.3
kV(6
%D
rop)
Load
ing
L B3 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
AA
C12
0mm
2
Type
of D
istri
bute
d Lo
adE
qual
ity
Load
LB
3
Line
Len
gth
Len B
314
.9km
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
3
1000
kVA
Vol
tage
Vr3
10.1
kV(8
%D
rop)
8%R
ated
Cur
rent
=455
A
36A
Line
Typ
e
: Rec
eive
d V
olta
ge
RT1
, RT2
, RB
1, R
B2,
RB
3
X T1,
X T2,
X B1,
X B2,
X B3
CA
PB
2, C
AP
B3
CA
P T1,
CA
PT2
, CA
PB
1: R
ecei
ved
Vol
tage
: Rec
eive
d V
olta
ge
Prim
ary
Sub
stat
ion
JICA
Stu
dy o
n "P
ower
Dis
trib
utio
n Sy
stem
MAs
ter
Plan
Stu
dy f
or Gha
na"
-
Step A (Type-3)
Pow
er S
yste
m A
naly
sis
for S
tep
A -
Pow
er S
yste
m A
naly
sis
for e
xist
ing
syst
em u
sing
Mac
ro d
eman
d fo
reca
st -
No.
7N
o.7
No.
7
→I m
axR
T1
=3.5Ω
XT1
=4.6Ω
RT2
=1.8Ω
XT2
=2.4Ω
RB
2=4
.1Ω
XB
2=5
.3Ω
Trun
k Li
ne 1
Trun
k Li
ne 2
Bra
nch
Line
2
RB
1=2
.8Ω
XB
1=3
.7Ω
RB
3=.
5ΩX
B3
=.6Ω
Bra
nch
Line
1B
ranc
h Li
ne 3
No.
7N
o.7
====
=Equ
atio
n===
==V
i1 =
Vs
- 1.7
32・(R
T1co
sθ +
XT1
sinθ
)・(L
T1・f T
1 + L
T2 +
LB
1 +
L B2 +
L B3)
Vi2 =
Vi1
- 1.
732・
(RT2
cosθ
+ X
T2si
nθ)・
(LT2
・f T
2 + L
B2 +
L B3)
Vr1
= V
i1 -
1.73
2・L B
1(R
B1c
osθ
+ X
B1s
inθ
)・f B
1
Vr2
= V
i2 -
1.73
2・L B
2(R
B2c
osθ
+ X
B2s
inθ
)・f B
2
Vr3
= V
i2 -
1.73
2・L B
3(R
B3c
osθ
+ X
B3s
inθ
)・f B
3
LT1
= I
max
・C
AP
T1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LT2
= I
max
・C
AP
T2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
1 =
Im
ax・C
AP
B1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
2 =
Im
ax・C
AP
B2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
3 =
Im
ax・C
AP
B3／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
I max
= L
T1
+ L
T2
+ L
B1 +
LB
2 +
LB
3
Vs
: Sup
ply
Vol
tage
I max
: Max
imum
Cur
rent
: Res
ista
nce
Vi1
: Int
erim
Vol
tage
L T1
: Loa
d (T
runk
line
1)
: Rea
ctan
ceV
i2: I
nter
im V
olta
geL T
2: L
oad
(Tru
nk li
ne 2
)f T
1, f T
2, f B
1, f B
2, f B
3
Vr1
L B1
: Loa
d (B
ranc
h Li
ne 1
)V
r2L B
2: L
oad
(Bra
nch
Line
2)
Vr3
L B3
: Loa
d (B
ranc
h Li
ne 3
)co
sθ: P
ower
Fac
tor
: Dis
pers
al L
oad
Fact
or
: Tot
al T
rans
form
er C
apac
ity o
f sec
onda
ry s
ubst
atio
ns
Type
of D
istri
bute
d Lo
adE
qual
ityTo
tal T
rans
form
erC
apac
ity o
f sec
onda
rysu
bsta
tions
CA
P T2
1340
kVA
L B1 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
44A
AA
C12
0mm
2
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
1
2755
kVA
AA
C12
0mm
2
Type
of D
istri
bute
d Lo
adE
qual
ityLi
ne L
engt
h Le
n B1
14.9
km
Vol
tage
Vr2
7.5k
V(3
2%D
rop)
Load
ing
30%
Rat
ed C
urre
nt=4
55A
Max
imum
L T1
(Dis
tribu
ted
Load
)
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP T
1
8045
kVA
L B2 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
Pow
er fa
ctor
Loading
Load
LB
1
Sub
stat
ion
Nam
eM
AIN
BFe
eder
Nam
eB
81
Load
ing
Type
-3
Cur
rent
I max
350.
0A
Load
LT1
Type
of D
istri
bute
d Lo
ad
Line
Typ
e12
9 AA
AC
120m
m2
Equ
ality
Line
Leg
th L
enT2
6.6k
mLi
ne T
ype
Vol
tage
Vi1
8.8k
VR
ated
Cur
rent
77%
8.6k
V(2
2%D
rop)
Vol
tage
Vr1
10%
Line
Typ
eA
AC
120m
m2
0.97
Line
Leg
th L
enT1
12.8
km
(cosθ)
(20%
Dro
p)=4
55A
Vol
tage
VS
11.0
kV
Equ
ality
Line
Len
gth
Len B
110
.3km
Line
Typ
e
Type
of D
istri
bute
d Lo
ad
: Inp
ut d
ata
in c
olor
ed c
ells
=455
A
Rat
ed C
urre
nt=4
55A
Load
LB
213
6A
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
2
8495
kVA
Load
LT2
21A
L T2
(Dis
tribu
ted
Load
)
Loading
39%
Rat
ed C
urre
nt
Vol
tage
Vi2
8.1k
V(2
6%D
rop)
Load
ing
L B3 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
AA
C12
0mm
2
Type
of D
istri
bute
d Lo
adR
ecei
ved
Larg
er
Load
LB
3
Line
Len
gth
Len B
31.
7km
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
3
1200
kVA
Vol
tage
Vr3
8.1k
V(2
7%D
rop)
4%R
ated
Cur
rent
=455
A
19A
Line
Typ
e
: Rec
eive
d V
olta
ge
RT1
, RT2
, RB
1, R
B2,
RB
3
X T1,
X T2,
X B1,
X B2,
X B3
CA
PB
2, C
AP
B3
CA
P T1,
CA
PT2
, CA
PB
1: R
ecei
ved
Vol
tage
: Rec
eive
d V
olta
ge
Prim
ary
Sub
stat
ion
JICA
Stu
dy o
n "P
ower
Dis
trib
utio
n Sy
stem
MAs
ter
Plan
Stu
dy f
or Gha
na"
-
Step A (Type-3)
Pow
er S
yste
m A
naly
sis
for S
tep
A -
Pow
er S
yste
m A
naly
sis
for e
xist
ing
syst
em u
sing
Mac
ro d
eman
d fo
reca
st -
No.
11N
o.11
No.
11
→I m
axR
T1
=.3Ω
XT1
=.2Ω
RT2
=1.3Ω
XT2
=.8Ω
RB
2=1
.6Ω
XB
2=1
.0Ω
Trun
k Li
ne 1
Trun
k Li
ne 2
Bra
nch
Line
2
RB
1=2
.6Ω
XB
1=1
.6Ω
RB
3=3
.0Ω
XB
3=1
.9Ω
Bra
nch
Line
1B
ranc
h Li
ne 3
No.
11N
o.11
====
=Equ
atio
n===
==V
i1 =
Vs
- 1.7
32・(R
T1co
sθ +
XT1
sinθ
)・(L
T1・f T
1 + L
T2 +
LB
1 +
L B2 +
L B3)
Vi2 =
Vi1
- 1.
732・
(RT2
cosθ
+ X
T2si
nθ)・
(LT2
・f T
2 + L
B2 +
L B3)
Vr1
= V
i1 -
1.73
2・L B
1(R
B1c
osθ
+ X
B1s
inθ
)・f B
1
Vr2
= V
i2 -
1.73
2・L B
2(R
B2c
osθ
+ X
B2s
inθ
)・f B
2
Vr3
= V
i2 -
1.73
2・L B
3(R
B3c
osθ
+ X
B3s
inθ
)・f B
3
LT1
= I
max
・C
AP
T1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LT2
= I
max
・C
AP
T2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
1 =
Im
ax・C
AP
B1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
2 =
Im
ax・C
AP
B2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
3 =
Im
ax・C
AP
B3／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
I max
= L
T1
+ L
T2
+ L
B1 +
LB
2 +
LB
3
Vs
: Sup
ply
Vol
tage
I max
: Max
imum
Cur
rent
: Res
ista
nce
Vi1
: Int
erim
Vol
tage
L T1
: Loa
d (T
runk
line
1)
: Rea
ctan
ceV
i2: I
nter
im V
olta
geL T
2: L
oad
(Tru
nk li
ne 2
)f T
1, f T
2, f B
1, f B
2, f B
3
Vr1
L B1
: Loa
d (B
ranc
h Li
ne 1
)V
r2L B
2: L
oad
(Bra
nch
Line
2)
Vr3
L B3
: Loa
d (B
ranc
h Li
ne 3
)co
sθ: P
ower
Fac
tor
: Dis
pers
al L
oad
Fact
or
: Tot
al T
rans
form
er C
apac
ity o
f sec
onda
ry s
ubst
atio
ns
Type
of D
istri
bute
d Lo
adC
once
ntra
ted
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP T
2
200k
VA
L B1 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
4AA
AC
50m
m2
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
1
150k
VA
AA
C50
mm
2
Type
of D
istri
bute
d Lo
adR
ecei
ved
Larg
er
Line
Len
gth
Len B
12.
7km
Vol
tage
Vr2
10.9
kV(1
%D
rop)
Load
ing
2%R
ated
Cur
rent
=260
A
Max
imum
L T1
(Dis
tribu
ted
Load
)
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP T
1
kVA
L B2 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
Pow
er fa
ctor
Loading
Load
LB
1
Sub
stat
ion
Nam
eK
UM
AW
UFe
eder
Nam
eB
OD
OM
AS
E
Load
ing
Type
-3
Cur
rent
I max
19.0
A
Load
LT1
Type
of D
istri
bute
d Lo
ad
Line
Typ
eA
AA
C50
mm
2Li
ne L
egth
Len
T22.
1km
Line
Typ
e
Vol
tage
Vi1
11.0
kVR
ated
Cur
rent
7%
11.0
kV(0
%D
rop)
Vol
tage
Vr1
2%
Line
Typ
eA
AC
50m
m2
0.82
Line
Leg
th L
enT1
.5km
(cosθ)
(0%
Dro
p)=2
60A
Vol
tage
VS
11.0
kV
Rec
eive
d La
rger
Line
Len
gth
Len B
14.
2km
Line
Typ
e
Type
of D
istri
bute
d Lo
ad
: Inp
ut d
ata
in c
olor
ed c
ells
=260
A
Rat
ed C
urre
nt=2
60A
Load
LB
24A
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
2
150k
VA
Load
LT2
6A
L T2
(Dis
tribu
ted
Load
)
Loading
6%R
ated
Cur
rent
Vol
tage
Vi2
11.0
kV(0
%D
rop)
Load
ing
L B3 (D
istri
bute
d or
Con
cent
rate
d Lo
ad)
AA
C50
mm
2
Type
of D
istri
bute
d Lo
adR
ecei
ved
Larg
er
Load
LB
3
Line
Len
gth
Len B
35.
0km
Tota
l Tra
nsfo
rmer
Cap
acity
of s
econ
dary
subs
tatio
ns C
AP B
3
150k
VA
Vol
tage
Vr3
10.9
kV(1
%D
rop)
2%R
ated
Cur
rent
=260
A
4ALi
ne T
ype
: Rec
eive
d V
olta
ge
RT1
, RT2
, RB
1, R
B2,
RB
3
X T1,
X T2,
X B1,
X B2,
X B3
CA
PB
2, C
AP
B3
CA
P T1,
CA
PT2
, CA
PB
1: R
ecei
ved
Vol
tage
: Rec
eive
d V
olta
ge
Prim
ary
Sub
stat
ion
JICA
Stu
dy o
n "P
ower
Dis
trib
utio
n Sy
stem
MAs
ter
Plan
Stu
dy f
or Gha
na"
-
Step A (Type-3)
Pow
er S
yste
m A
naly
sis
for S
tep
A -
Pow
er S
yste
m A
naly
sis
for e
xist
ing
syst
em u
sing
Mac
ro d
eman
d fo
reca
st -
No.
7N
o.7
No.
7
→I m
axR
T1
=1.9Ω
XT1
=2.5Ω
RT2
=.5Ω
XT2
=.7Ω
RB
2=.
7ΩX
B2
=1.0Ω
Trun
k Li
ne 1
Trun
k Li
ne 2
Bra
nch
Line
2
RB
1=.
7ΩX
B1
=.9Ω
RB
3=.
5ΩX
B3
=.6Ω
Bra
nch
Line
1B
ranc
h Li
ne 3
No.
7N
o.7
====
=Equ
atio
n===
==V
i1 =
Vs
- 1.7
32・(R
T1co
sθ +
XT1
sinθ
)・(L
T1・f T
1 + L
T2 +
LB
1 +
L B2 +
L B3)
Vi2 =
Vi1
- 1.
732・
(RT2
cosθ
+ X
T2si
nθ)・
(LT2
・f T
2 + L
B2 +
L B3)
Vr1
= V
i1 -
1.73
2・L B
1(R
B1c
osθ
+ X
B1s
inθ
)・f B
1
Vr2
= V
i2 -
1.73
2・L B
2(R
B2c
osθ
+ X
B2s
inθ
)・f B
2
Vr3
= V
i2 -
1.73
2・L B
3(R
B3c
osθ
+ X
B3s
inθ
)・f B
3
LT1
= I
max
・C
AP
T1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LT2
= I
max
・C
AP
T2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
1 =
Im
ax・C
AP
B1／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
2 =
Im
ax・C
AP
B2／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
LB
3 =
Im
ax・C
AP
B3／
(CA
PT1+
CA
PT2+
CA
PB
1+C
AP
B2+C
AP
B3)
I max
= L
T1
+ L
T2
+ L
B1 +
LB
2 +
LB
3
Vs
: Sup
ply
Vol
tage
I max
: Max
imum
Cur
rent
: Res
ista
nce
Vi1
: Int
erim
Vol
tage
L T1
: Loa
d (T
runk
line
1)
: Rea
ctan
ceV
i2: I
nter
im V
olta
geL T
2: L
oad
(Tru
nk li
ne 2
)f T
1, f T
2, f B
1, f B
2, f B
3
Vr1
L B1
: Loa
d (B
ranc
h Li
ne 1
)V
r2L B
2: L
oad
(Bra
nch
Line
2)
Vr3
L B3
: Loa
d (B
ranc
h Li
ne 3
)co
sθ: P
ower
Fac
tor
: Dis
pers
al L
oad
Fact
or
: Tot
al T
rans
form
er C
apac
ity o
f sec
onda
ry s
ubst
atio
ns
Type
of D
istri
bute
d Lo
adR
ecei
ved
Larg
er
Tota
l Tra