Power System Analysis

- Accra East 11kV -

F13(FK01)

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.

24

→I m

axD

istri

bute

d Lo

adR

T=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

Tsin

θ)・

f T

Vs

: Sup

ply

Vol

tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Sub

stat

ion

Nam

eOK

OM

LEM

LE (M

AIN

Feed

er N

ame

F13(

FK01

)

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Vol

tage

Vr

10.8

kVR

ated

Cur

rent

33%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

9km

(cosθ)

(1%

Dro

p)

Vol

tage

VS

11.0

kV

Max

imum

Cur

rent

I max

109A

Pow

er fa

ctor

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"

F03(FD38)

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.

24

→I m

axD

istri

bute

d Lo

adR

T=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

Tsin

θ)・

f T

Vs

: Sup

ply

Vol

tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Max

imum

Cur

rent

I max

260A

Pow

er fa

ctor

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

9km

(cosθ)

(4%

Dro

p)

Vol

tage

VS

11.0

kVV

olta

ge V

r

10.6

kVR

ated

Cur

rent

78%

Loading

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Sub

stat

ion

Nam

e OK

OM

LEM

LE (M

AIN

Feed

er N

ame

F03(

FD38

)

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"

F15(FK02)

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.

24

→I m

axD

istri

bute

d Lo

adR

T=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

Tsin

θ)・

f T

Vs

: Sup

ply

Vol

tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Sub

stat

ion

Nam

eOK

OM

LEM

LE (M

AIN

Feed

er N

ame

F15(

FK02

)

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Vol

tage

Vr

10.6

kVR

ated

Cur

rent

94%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

8km

(cosθ)

(4%

Dro

p)

Vol

tage

VS

11.0

kV

Max

imum

Cur

rent

I max

316A

Pow

er fa

ctor

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"

F11(FD19)

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.

24

→I m

axD

istri

bute

d Lo

adR

T=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

Tsin

θ)・

f T

Vs

: Sup

ply

Vol

tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Max

imum

Cur

rent

I max

333A

Pow

er fa

ctor

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

9km

(cosθ)

(5%

Dro

p)

Vol

tage

VS

11.0

kVV

olta

ge V

r

10.5

kVR

ated

Cur

rent

99%

Loading

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Sub

stat

ion

Nam

e OK

OM

LEM

LE (M

AIN

Feed

er N

ame

F11(

FD19

)

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"

F04(FD48)

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.

24

→I m

axD

istri

bute

d Lo

adR

T=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

Tsin

θ)・

f T

Vs

: Sup

ply

Vol

tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Sub

stat

ion

Nam

eOK

OM

LEM

LE (M

AIN

Feed

er N

ame

F04(

FD48

)

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Vol

tage

Vr

10.7

kVR

ated

Cur

rent

75%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

8km

(cosθ)

(3%

Dro

p)

Vol

tage

VS

11.0

kV

Max

imum

Cur

rent

I max

252A

Pow

er fa

ctor

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"

(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

=1Ω

XT1

=2Ω

RT2

=1Ω

XT2

=1Ω

RB

2=1Ω

XB

2=1Ω

Trun

k Li

ne 1

Trun

k Li

ne 2

Bra

nch

Line

2

RB

1=1Ω

XB

1=1Ω

RB

3=1Ω

XB

3=1Ω

Bra

nch

Line

1B

ranc

h Li

ne 3

No.

7N

o.7

====

=Equ

atio

n===

==V

i1 =

Vs－

1.73

2・(R

T1co

sθ +

XT1

sinθ

)・(L

T1・f T

1 + L

T2 +

LB

1 +

L B2 +

L B3)

Vi2 =

Vi1－

1.73

2・(R

T2co

sθ +

XT2

sinθ

)・(L

T2・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

ity

Tota

l Tra

nsfo

rmer

Cap

acity

of s

econ

dary

subs

tatio

ns C

AP T

2

L B1 (D

istri

bute

d or

Con

cent

rate

d Lo

ad)

215A

AA

C12

0mm

2

Tota

l Tra

nsfo

rmer

Cap

acity

of s

econ

dary

subs

tatio

ns C

AP B

1

2630

kVA

AA

C12

0mm

2Ty

pe o

f Loa

dE

qual

ityLi

ne L

engt

h Le

n B1

2km

Vol

tage

Vr2

9.1k

V(1

7%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

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

eA

DE

NTA

(MA

IN T

)Fe

eder

Nam

eT0

4(R

ED

CO

)

Load

ing

Type

-3

Cur

rent

I max

415A

Load

LT1

Type

of D

istri

bute

d Lo

ad

Line

Typ

eA

AA

C12

0mm

2

Equ

ality

Line

Leg

th L

enT2

2km

Line

Typ

e

Vol

tage

Vi1

9.5k

VR

ated

Cur

rent

91%

9.3k

V(1

6%D

rop)

Vol

tage

Vr1

47%

Line

Typ

eA

AC

120m

m2

0.85

Line

Leg

th L

enT1

5km

(cosθ)

(14%

Dro

p)=4

55A

Vol

tage

VS

11.0

kV

Equ

ality

Line

Len

gth

Len B

13k

m

Line

Typ

e

Type

of L

oad

: Inp

ut d

ata

in c

olor

ed c

ells

=455

A

Rat

ed C

urre

nt=4

55A

Load

LB

267

A

Tota

l Tra

nsfo

rmer

Cap

acity

of s

econ

dary

subs

tatio

ns C

AP B

2

815k

VA

Load

LT2

A

L T2

(Dis

tribu

ted

Load

)

Loading

44%

Rat

ed C

urre

nt

Vol

tage

Vi2

9.2k

V(1

9%D

rop)

Load

ing

133A

Line

Typ

eA

AC

120m

m2

Type

of L

oad

Equ

ality

Load

LB

3

Line

Len

gth

Len B

34k

m

Tota

l Tra

nsfo

rmer

Cap

acity

of s

econ

dary

subs

tatio

ns C

AP B

3

1630

kVA

Vol

tage

Vr3

9.0k

V(1

8%D

rop)

L B3 (D

istri

bute

d or

Con

cent

rate

d Lo

ad)

29%

Rat

ed C

urre

nt=4

55A

: 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"

G013(G56)

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.

24

→I m

axD

istri

bute

d Lo

adRT

=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

Tsinθ

)・f T

Vs

: Sup

ply

Vol

tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Sub

stat

ion

Nam

eWE

R H

OU

SE

(MA

IINFe

eder

Nam

eG

013(

G56

)

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Vol

tage

Vr

10.7

kVR

ated

Cur

rent

72%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

8km

(cosθ)

(3%

Dro

p)

Vol

tage

VS

11.0

kV

Max

imum

Cur

rent

I max

240A

Pow

er fa

ctor

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"

G07(G06)

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.

24

→I m

axD

istri

bute

d Lo

adRT

=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

Tsinθ

)・f T

Vs

: Sup

ply

Vol

tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Max

imum

Cur

rent

I max

215A

Pow

er fa

ctor

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

4km

(cosθ)

(1%

Dro

p)

Vol

tage

VS

11.0

kVV

olta

ge V

r

10.9

kVR

ated

Cur

rent

64%

Loading

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Sub

stat

ion

Nam

e WE

R H

OU

SE

(MA

IINFe

eder

Nam

eG

07(G

06)

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"

G11(G13)

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.

24

→I m

axD

istri

bute

d Lo

adRT

=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

Tsinθ

)・f T

Vs

: Sup

ply

Vol

tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

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d V

olta

geX

T: R

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ance

I max

: Max

imum

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rent

cosθ

: Pow

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acto

r

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stat

ion

Nam

eWE

R H

OU

SE

(MA

IINFe

eder

Nam

eG

11(G

13)

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Vol

tage

Vr

10.7

kVR

ated

Cur

rent

75%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

7km

(cosθ)

(2%

Dro

p)

Vol

tage

VS

11.0

kV

Max

imum

Cur

rent

I max

250A

Pow

er fa

ctor

Prim

ary

Sub

stat

ion

JICA

Stu

dy o

n "P

ower

Dis

trib

utio

n Sy

stem

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ter

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dy f

or Gha

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G19(G60)

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m A

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m A

naly

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for e

xist

ing

syst

em u

sing

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eman

d fo

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st -

No.

24

→I m

axD

istri

bute

d Lo

adRT

=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

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Vs

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ply

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tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

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eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Max

imum

Cur

rent

I max

300A

Pow

er fa

ctor

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

8km

(cosθ)

(4%

Dro

p)

Vol

tage

VS

11.0

kVV

olta

ge V

r

10.6

kVR

ated

Cur

rent

90%

Loading

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Sub

stat

ion

Nam

eW

ER

HO

US

E(M

AIN

Feed

er N

ame

G19

(G60

)

Prim

ary

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stat

ion

JICA

Stu

dy o

n "P

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Dis

trib

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ter

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G12(G47)

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m A

naly

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for S

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A -

Pow

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m A

naly

sis

for e

xist

ing

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em u

sing

Mac

ro d

eman

d fo

reca

st -

No.

24

→I m

axD

istri

bute

d Lo

adRT

=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

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Vs

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ply

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tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

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eive

d V

olta

geX

T: R

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ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Sub

stat

ion

Nam

eWE

R H

OU

SE

(MA

IINFe

eder

Nam

eG

12(G

47)

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Rec

eive

d La

rger

Vol

tage

Vr

10.6

kVR

ated

Cur

rent

87%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

6km

(cosθ)

(4%

Dro

p)

Vol

tage

VS

11.0

kV

Max

imum

Cur

rent

I max

290A

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er fa

ctor

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ary

Sub

stat

ion

JICA

Stu

dy o

n "P

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trib

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ter

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m A

naly

sis

for e

xist

ing

syst

em u

sing

Mac

ro d

eman

d fo

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st -

No.

24

→I m

axD

istri

bute

d Lo

adRT

=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

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ply

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tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

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d V

olta

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T: R

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ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Max

imum

Cur

rent

I max

260A

Pow

er fa

ctor

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

7km

(cosθ)

(3%

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p)

Vol

tage

VS

11.0

kVV

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ge V

r

10.7

kVR

ated

Cur

rent

78%

Loading

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Sub

stat

ion

Nam

e WE

R H

OU

SE

(MA

IINFe

eder

Nam

eG

02(G

33)

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stat

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JICA

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n "P

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m A

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for e

xist

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em u

sing

Mac

ro d

eman

d fo

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st -

No.

24

→I m

axD

istri

bute

d Lo

adRT

=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

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I max

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f T: D

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I max

: Max

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rent

cosθ

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acto

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stat

ion

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eWE

R H

OU

SE

(MA

IINFe

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Nam

eG

06(G

64)

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Vol

tage

Vr

10.7

kVR

ated

Cur

rent

81%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

6km

(cosθ)

(2%

Dro

p)

Vol

tage

VS

11.0

kV

Max

imum

Cur

rent

I max

270A

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ctor

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ary

Sub

stat

ion

JICA

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dy o

n "P

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m A

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em u

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Mac

ro d

eman

d fo

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st -

No.

24

→I m

axD

istri

bute

d Lo

adRT

=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

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ply

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tage

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ista

nce

f T: D

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Vr

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ance

I max

: Max

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rent

cosθ

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acto

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stat

ion

Nam

eWE

R H

OU

SE

(MA

IINFe

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Nam

eG

04(G

351)

Type

of D

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bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Vol

tage

Vr

10.6

kVR

ated

Cur

rent

72%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

9km

(cosθ)

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p)

Vol

tage

VS

11.0

kV

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imum

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rent

I max

240A

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ctor

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stat

ion

JICA

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dy o

n "P

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ro d

eman

d fo

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st -

No.

24

→I m

axD

istri

bute

d Lo

adRT

=2Ω

XT

=2Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

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tage

RT

: Res

ista

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f T: D

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ance

I max

: Max

imum

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rent

cosθ

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er F

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r

Max

imum

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rent

I max

310A

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er fa

ctor

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

12km

(cosθ)

(6%

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p)

Vol

tage

VS

11.0

kVV

olta

ge V

r

10.4

kVR

ated

Cur

rent

93%

Loading

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Sub

stat

ion

Nam

e WE

R H

OU

SE

(MA

IINFe

eder

Nam

eG

21(G

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stat

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JICA

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ro d

eman

d fo

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No.

7

→I m

axD

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d Lo

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T=4Ω

XT

=5Ω

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k Li

ne

====

=Equ

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n===

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s－1.

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stat

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e AC

HIM

OTA

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IN H

Feed

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H02

(H35

1)

Type

of D

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bute

d Lo

ad

Line

Typ

eA

AC

120m

m2

Equ

ality

Vol

tage

Vr

8.9k

VR

ated

Cur

rent

85%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=455

A

Type

-1

0.85

Line

Leg

th L

enT

15km

(cosθ)

(19%

Dro

p)

Vol

tage

VS

11.0

kV

Max

imum

Cur

rent

I max

387A

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ctor

Prim

ary

Sub

stat

ion

JICA

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dy o

n "P

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m A

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em u

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Mac

ro d

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d fo

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No.

24

→I m

axD

istri

bute

d Lo

adR

T=2Ω

XT

=2Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V r

= V

s－1.

732・

I max

(RTc

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ance

I max

: Max

imum

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rent

cosθ

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imum

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rent

I max

304A

Pow

er fa

ctor

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

13km

(cosθ)

(6%

Dro

p)

Vol

tage

VS

11.0

kVV

olta

ge V

r

10.3

kVR

ated

Cur

rent

91%

Loading

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Sub

stat

ion

Nam

eAC

HIM

OTA

(MA

IN H

Feed

er N

ame

H05

(H06

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stat

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JICA

Stu

dy o

n "P

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m A

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sing

Mac

ro d

eman

d fo

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No.

24

→I m

axD

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bute

d Lo

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T=2Ω

XT

=2Ω

Trun

k Li

ne

====

=Equ

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n===

==V r

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s－1.

732・

I max

(RTc

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ance

I max

: Max

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rent

cosθ

: Pow

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stat

ion

Nam

e AC

HIM

OTA

(MA

IN H

Feed

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ame

H10

(H10

)

Type

of D

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bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Vol

tage

Vr

10.3

kVR

ated

Cur

rent

84%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

14km

(cosθ)

(6%

Dro

p)

Vol

tage

VS

11.0

kV

Max

imum

Cur

rent

I max

280A

Pow

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ctor

Prim

ary

Sub

stat

ion

JICA

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dy o

n "P

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m A

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em u

sing

Mac

ro d

eman

d fo

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No.

24

→I m

axD

istri

bute

d Lo

adR

T=2Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

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n===

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= V

s－1.

732・

I max

(RTc

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I max

: Max

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rent

cosθ

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imum

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rent

I max

265A

Pow

er fa

ctor

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

11km

(cosθ)

(4%

Dro

p)

Vol

tage

VS

11.0

kVV

olta

ge V

r

10.5

kVR

ated

Cur

rent

79%

Loading

Type

of D

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bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Sub

stat

ion

Nam

eAC

HIM

OTA

(MA

IN H

Feed

er N

ame

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JICA

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Mac

ro d

eman

d fo

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st -

No.

24

→I m

axD

istri

bute

d Lo

adR

T=1Ω

XT

=ΩTr

unk

Line

====

=Equ

atio

n===

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= V

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732・

I max

(RTc

osθ

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I max

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rent

cosθ

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rent

I max

245A

Pow

er fa

ctor

: Inp

ut d

ata

in c

olor

ed c

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=335

A

Type

-1

0.85

Line

Leg

th L

enT

4km

(cosθ)

(1%

Dro

p)

Vol

tage

VS

11.0

kVV

olta

ge V

r

10.9

kVR

ated

Cur

rent

73%

Loading

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Sub

stat

ion

Nam

eAC

HIM

OTA

(MA

IN H

Feed

er N

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H07

(H35

1)

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"

H08(H24)

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=2Ω

XT

=2Ω

RB

1=Ω

XB

1=Ω

Trun

k Li

neB

ranc

h Li

ne 1

RB

2=Ω

XB

2=Ω

====

=Equ

atio

n===

==B

ranc

h Li

ne 2

V i =

Vs－

1.73

2・(R

Tcos

θ +

XTs

inθ

)(L T

・f T

+ (L

B1+

L B2)

)V r

1 = V

i－1.

732・

L B1(

RB

1cos

θ +

XB

1sin

θ)・

f B1

V r2 =

Vi－

1.73

2・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.

24L

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

13k

m

Line

Typ

eTy

pe o

f Loa

d

76A

Tota

l Tra

nsfo

rmer

Cap

acity

of s

econ

dary

subs

tatio

ns C

AP B

1

2100

kVA

Load

LB

225

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)

0.85

Line

Leg

th L

enT

12km

(cosθ)

Vol

tage

VS

11.0

kVR

ated

Cur

rent

84%

Loading

L T (D

istri

bute

d Lo

ad)

Load

LT

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

0A18

5ALX

PLE

(11k

V)

Equ

ality

Equ

ality

Load

LB

1

185A

LXP

LE(1

1kV

)

Sub

stat

ion

Nam

eAC

HIM

OTA

(MA

IN H

Feed

er N

ame

H08

(H24

)

Type

-2

Cur

rent

I max

281A

Pow

er fa

ctor

Max

imum

Tota

l Tra

nsfo

rmer

Cap

acity

of s

econ

dary

subs

tatio

ns C

AP T

4975

kVA

Type

of L

oad

Equ

ality

RT,

RB

1, R

B2

XT,

XB

1, X

B2

(7%

Dro

p)10

.2kV

(7%

Dro

p)

Line

Typ

e18

5ALX

PLE

(11k

V)

10.2

kVV

olta

ge V

r123

%V

olta

ge V

i

(7%

Dro

p)

Load

ing

8%R

ated

Cur

rent

=335

AV

olta

ge V

r2

10.2

kV

: Tot

al T

rans

form

er C

apac

ity o

f sec

onda

ry s

ubst

atio

ns

Line

Len

gth

Len B

12k

mTo

tal T

rans

form

erC

apac

ity o

f sec

onda

rysu

bsta

tions

CA

P B2

700k

VA

CA

PT,

CA

P B1,

CA

P B2

: Rec

eive

d V

olta

ge: R

ecei

ved

Vol

tage

: Dis

pers

al L

oad

Fact

or

Prim

ary

Sub

stat

ion

JICA Study on "Power Distribution System Master Plan Study for G

hana"

K03(K09)

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=1Ω

XT

=1Ω

RB

1=Ω

XB

1=Ω

Trun

k Li

neB

ranc

h Li

ne 1

RB

2=1Ω

XB

2=1Ω

====

=Equ

atio

n===

==B

ranc

h Li

ne 2

V i =

Vs－

1.73

2・(R

Tcos

θ +

XTs

inθ

)(L T

・f T

+ (L

B1+

L B2)

)V r

1 = V

i－1.

732・

L B1(

RB

1cos

θ +

XB

1sin

θ)・

f B1

V r2 =

Vi－

1.73

2・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.

24L

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

12k

m

Line

Typ

eTy

pe o

f Loa

d

34A

Tota

l Tra

nsfo

rmer

Cap

acity

of s

econ

dary

subs

tatio

ns C

AP B

1

1315

kVA

Load

LB

265

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)

0.85

Line

Leg

th L

enT

6km

(cosθ)

Vol

tage

VS

11.0

kVR

ated

Cur

rent

63%

Loading

L T (D

istri

bute

d Lo

ad)

Load

LT

Type

of D

istri

bute

d Lo

ad

Line

Typ

e11

1A18

5ALX

PLE

(11k

V)

Equ

ality

Equ

ality

Load

LB

1

185A

LXP

LE(1

1kV

)

Sub

stat

ion

Nam

eCH

BA

CK

RO

AD

(MA

Feed

er N

ame

K03

(K09

)

Type

-2

Cur

rent

I max

210A

Pow

er fa

ctor

Max

imum

Tota

l Tra

nsfo

rmer

Cap

acity

of s

econ

dary

subs

tatio

ns C

AP T

4215

kVA

Type

of L

oad

Equ

ality

RT,

RB

1, R

B2

XT,

XB

1, X

B2

(3%

Dro

p)10

.7kV

(3%

Dro

p)

Line

Typ

e18

5ALX

PLE

(11k

V)

10.7

kVV

olta

ge V

r110

%V

olta

ge V

i

(3%

Dro

p)

Load

ing

19%

Rat

ed C

urre

nt

=335

AV

olta

ge V

r2

10.6

kV

: Tot

al T

rans

form

er C

apac

ity o

f sec

onda

ry s

ubst

atio

ns

Line

Len

gth

Len B

15k

mTo

tal T

rans

form

erC

apac

ity o

f sec

onda

rysu

bsta

tions

CA

P B2

2480

kVA

CA

PT,

CA

P B1,

CA

P B2

: Rec

eive

d V

olta

ge: R

ecei

ved

Vol

tage

: Dis

pers

al L

oad

Fact

or

Prim

ary

Sub

stat

ion

JICA Study on "Power Distribution System Master Plan Study for G

hana"

K04(K10)

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.

24

→I m

axD

istri

bute

d Lo

adR

T=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

Tsin

θ)・

f T

Vs

: Sup

ply

Vol

tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Max

imum

Cur

rent

I max

285A

Pow

er fa

ctor

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

10km

(cosθ)

(4%

Dro

p)

Vol

tage

VS

11.0

kVV

olta

ge V

r

10.5

kVR

ated

Cur

rent

85%

Loading

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Sub

stat

ion

Nam

e CH

BA

CK

RO

AD

(MA

Feed

er N

ame

K04

(K10

)

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"

K05(K150)

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.

24

→I m

axD

istri

bute

d Lo

adR

T=3Ω

XT

=3Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

Tsin

θ)・

f T

Vs

: Sup

ply

Vol

tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Sub

stat

ion

Nam

eCH

BA

CK

RO

AD

(MA

Feed

er N

ame

K05

(K15

0)

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Vol

tage

Vr

9.8k

VR

ated

Cur

rent

103%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

20km

(cosθ)

(11%

Dro

p)

Vol

tage

VS

11.0

kV

Max

imum

Cur

rent

I max

346A

Pow

er fa

ctor

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"

K13(K13)

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.

24

→I m

axD

istri

bute

d Lo

adR

T=3Ω

XT

=2Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

Tsin

θ)・

f T

Vs

: Sup

ply

Vol

tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Max

imum

Cur

rent

I max

270A

Pow

er fa

ctor

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

17km

(cosθ)

(7%

Dro

p)

Vol

tage

VS

11.0

kVV

olta

ge V

r

10.2

kVR

ated

Cur

rent

81%

Loading

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Sub

stat

ion

Nam

e CH

BA

CK

RO

AD

(MA

Feed

er N

ame

K13

(K13

)

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"

K06(K60)

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.

24

→I m

axD

istri

bute

d Lo

adR

T=2Ω

XT

=2Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

Tsin

θ)・

f T

Vs

: Sup

ply

Vol

tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Sub

stat

ion

Nam

eCH

BA

CK

RO

AD

(MA

Feed

er N

ame

K06

(K60

)

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Vol

tage

Vr

10.3

kVR

ated

Cur

rent

91%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

13km

(cosθ)

(6%

Dro

p)

Vol

tage

VS

11.0

kV

Max

imum

Cur

rent

I max

305A

Pow

er fa

ctor

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"

K10(K61)

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.

24

→I m

axD

istri

bute

d Lo

adR

T=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

Tsin

θ)・

f T

Vs

: Sup

ply

Vol

tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Max

imum

Cur

rent

I max

198A

Pow

er fa

ctor

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

9km

(cosθ)

(4%

Dro

p)

Vol

tage

VS

11.0

kVV

olta

ge V

r

10.6

kVR

ated

Cur

rent

59%

Loading

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Rec

eive

d La

rger

Sub

stat

ion

Nam

eCH

BA

CK

RO

AD

(MA

Feed

er N

ame

K10

(K61

)

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"

K11(K06)

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.

24

→I m

axD

istri

bute

d Lo

adR

T=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V

r = V

s－1.

732・

I max

(RTc

osθ

+ X

Tsin

θ)・

f T

Vs

: Sup

ply

Vol

tage

RT

: Res

ista

nce

f T: D

ispe

rsal

Loa

d Fa

ctor

Vr

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Sub

stat

ion

Nam

eCH

BA

CK

RO

AD

(MA

Feed

er N

ame

K11

(K06

)

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Vol

tage

Vr

10.6

kVR

ated

Cur

rent

87%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

8km

(cosθ)

(4%

Dro

p)

Vol

tage

VS

11.0

kV

Max

imum

Cur

rent

I max

290A

Pow

er fa

ctor

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"

K12(K07)

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=Ω

XT

=ΩR

B1

=ΩX

B1

=ΩTr

unk

Line

Bra

nch

Line

1

RB

2=Ω

XB

2=Ω

====

=Equ

atio

n===

==B

ranc

h Li

ne 2

V i =

Vs－

1.73

2・(R

Tcos

θ +

XTs

inθ

)(L T

・f T

+ (L

B1+

L B2)

)V r

1 = V

i－1.

732・

L B1(

RB

1cos

θ +

XB

1sin

θ)・

f B1

V r2 =

Vi－

1.73

2・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.

24L

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

: Rec

eive

d V

olta

ge: R

ecei

ved

Vol

tage

: Dis

pers

al L

oad

Fact

or: T

otal

Tra

nsfo

rmer

Cap

acity

of s

econ

dary

sub

stat

ions

Line

Len

gth

Len B

12k

mTo

tal T

rans

form

erC

apac

ity o

f sec

onda

rysu

bsta

tions

CA

P B2

2065

kVA

CA

PT,

CA

P B1,

CA

P B2

Vol

tage

Vr1

27%

Vol

tage

Vi

(2%

Dro

p)

Load

ing

28%

Rat

ed C

urre

nt

=335

AV

olta

ge V

r2

10.8

kV

(2%

Dro

p)10

.7k V

(2%

Dro

p)

Line

Typ

e18

5ALX

PLE

(11k

V)

10.8

kV

Type

of L

oad

Equ

ality

RT,

RB

1, R

B2

XT,

XB

1, X

B2

Tota

l Tra

nsfo

rmer

Cap

acity

of s

econ

dary

subs

tatio

ns C

AP T

1000

kVA

Type

-2

Cur

rent

I max

233A

Pow

er fa

ctor

Max

imum

Sub

stat

ion

Nam

e CH

BA

CK

RO

AD

(MA

Feed

er N

ame

K12

(K07

) Load

LT

Type

of D

istri

bute

d Lo

ad

Line

Typ

e46

A18

5ALX

PLE

(11k

V)

Equ

ality

Equ

ality

Load

LB

1

185A

LXP

LE(1

1kV

)

0.85

Line

Leg

th L

enT

3km

(cosθ)

Vol

tage

VS

11.0

kVR

ated

Cur

rent

70%

Loading

L T (D

istri

bute

d Lo

ad)

2000

kVA

Load

LB

295

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)

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Rat

ed C

urre

nt=3

35A

Line

Len

gth

Len B

13k

m

Line

Typ

eTy

pe o

f Loa

d

92A

Tota

l Tra

nsfo

rmer

Cap

acity

of s

econ

dary

subs

tatio

ns C

AP B

1

Prim

ary

Sub

stat

ion

JICA Study on "Power Distribution System Master Plan Study for G

hana"

L11(L01)

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=1Ω

XT

=1Ω

RB

1=Ω

XB

1=Ω

Trun

k Li

neB

ranc

h Li

ne 1

RB

2=1Ω

XB

2=1Ω

====

=Equ

atio

n===

==B

ranc

h Li

ne 2

V i =

Vs－

1.73

2・(R

Tcos

θ +

XTs

inθ

)(L T

・f T

+ (L

B1+

L B2)

)V r

1 = V

i－1.

732・

L B1(

RB

1cos

θ +

XB

1sin

θ)・

f B1

V r2 =

Vi－

1.73

2・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.

24L

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

13k

m

Line

Typ

eTy

pe o

f Loa

d

157 A

Tota

l Tra

nsfo

rmer

Cap

acity

of s

econ

dary

subs

tatio

ns C

AP B

1

5500

kVA

Load

LB

228

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)

0.85

Line

Leg

th L

enT

8km

(cosθ)

Vol

tage

VS

11.0

kVR

ated

Cur

rent

78%

Loading

L T (D

istri

bute

d Lo

ad)

Load

LT

Type

of D

istri

bute

d Lo

ad

Line

Typ

e75

A18

5ALX

PLE

(11k

V)

Equ

ality

Equ

ality

Load

LB

1

185A

LXP

LE(1

1kV

)

Sub

stat

ion

Nam

eUR

MA

CA

MP

(MA

INFe

eder

Nam

eL1

1(L0

1)

Type

-2

Cur

rent

I max

260A

Pow

er fa

ctor

Max

imum

Tota

l Tra

nsfo

rmer

Cap

acity

of s

econ

dary

subs

tatio

ns C

AP T

2630

kVA

Type

of L

oad

Equ

ality

RT,

RB

1, R

B2

XT,

XB

1, X

B2

(5%

Dro

p)10

.3kV

(6%

Dro

p)

Line

Typ

e18

5ALX

PLE

(11k

V)

10.4

kVV

olta

ge V

r147

%V

olta

ge V

i

(6%

Dro

p)

Load

ing

9%R

ated

Cur

rent

=335

AV

olta

ge V

r2

10.4

kV

: Tot

al T

rans

form

er C

apac

ity o

f sec

onda

ry s

ubst

atio

ns

Line

Len

gth

Len B

17k

mTo

tal T

rans

form

erC

apac

ity o

f sec

onda

rysu

bsta

tions

CA

P B2

1000

kVA

CA

PT,

CA

P B1,

CA

P B2

: Rec

eive

d V

olta

ge: R

ecei

ved

Vol

tage

: Dis

pers

al L

oad

Fact

or

Prim

ary

Sub

stat

ion

JICA Study on "Power Distribution System Master Plan Study for G

hana"

L10(L22)

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.

24

→I m

axD

istri

bute

d Lo

adR

T=2Ω

XT

=2Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V r

= V

s－1.

732・

I max

(RTc

osθ

+ X

Tsin

θ)・

f T

V s: S

uppl

y V

olta

geR

T: R

esis

tanc

ef T

: Dis

pers

al L

oad

Fact

orV r

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Max

imum

Cur

rent

I max

205A

Pow

er fa

ctor

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

15km

(cosθ)

(5%

Dro

p)

Vol

tage

VS

11.0

kVV

olta

ge V

r

10.5

kVR

ated

Cur

rent

61%

Loading

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Sub

stat

ion

Nam

eUR

MA

CA

MP

(MA

INFe

eder

Nam

eL1

0(L2

2)

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"

L06(L12)

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.

24

→I m

axD

istri

bute

d Lo

adR

T=2Ω

XT

=2Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V r

= V

s－1.

732・

I max

(RTc

osθ

+ X

Tsin

θ)・

f T

V s: S

uppl

y V

olta

geR

T: R

esis

tanc

ef T

: Dis

pers

al L

oad

Fact

orV r

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Sub

stat

ion

Nam

e UR

MA

CA

MP

(MA

INFe

eder

Nam

eL0

6(L1

2)

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Vol

tage

Vr

10.5

kVR

ated

Cur

rent

81%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

12km

(cosθ)

(5%

Dro

p)

Vol

tage

VS

11.0

kV

Max

imum

Cur

rent

I max

270A

Pow

er fa

ctor

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"

L04(L03)

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.

24

→I m

axD

istri

bute

d Lo

adR

T=2Ω

XT

=2Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V r

= V

s－1.

732・

I max

(RTc

osθ

+ X

Tsin

θ)・

f T

V s: S

uppl

y V

olta

geR

T: R

esis

tanc

ef T

: Dis

pers

al L

oad

Fact

orV r

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Max

imum

Cur

rent

I max

220A

Pow

er fa

ctor

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

14km

(cosθ)

(5%

Dro

p)

Vol

tage

VS

11.0

kVV

olta

ge V

r

10.5

kVR

ated

Cur

rent

66%

Loading

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Sub

stat

ion

Nam

eUR

MA

CA

MP

(MA

INFe

eder

Nam

eL0

4(L0

3)

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"

L03(L02)

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.

24

→I m

axD

istri

bute

d Lo

adR

T=2Ω

XT

=2Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V r

= V

s－1.

732・

I max

(RTc

osθ

+ X

Tsin

θ)・

f T

V s: S

uppl

y V

olta

geR

T: R

esis

tanc

ef T

: Dis

pers

al L

oad

Fact

orV r

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Sub

stat

ion

Nam

e UR

MA

CA

MP

(MA

INFe

eder

Nam

eL0

3(L0

2)

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Vol

tage

Vr

10.3

kVR

ated

Cur

rent

84%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

16km

(cosθ)

(7%

Dro

p)

Vol

tage

VS

11.0

kV

Max

imum

Cur

rent

I max

280A

Pow

er fa

ctor

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"

M05(Old Legon 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.

24

→I m

axD

istri

bute

d Lo

adRT

=1Ω

XT

=1Ω

Trun

k Li

ne

====

=Equ

atio

n===

==V r

= V

s－1.

732・

I max

(RTc

osθ

+ X

Tsinθ

)・f T

V s: S

uppl

y V

olta

geR

T: R

esis

tanc

ef T

: Dis

pers

al L

oad

Fact

orV r

: Rec

eive

d V

olta

geX

T: R

eact

ance

I max

: Max

imum

Cur

rent

cosθ

: Pow

er F

acto

r

Sub

stat

ion

Nam

eLE

GO

N(M

AIN

M)

Feed

er N

ame

M05

(Old

lego

n 2)

Type

of D

istri

bute

d Lo

ad

Line

Typ

e18

5ALX

PLE

(11k

V)

Equ

ality

Vol

tage

Vr

10.6

kVR

ated

Cur

rent

84%

Loading

: Inp

ut d

ata

in c

olor

ed c

ells

=335

A

Type

-1

0.85

Line

Leg

th L

enT

8km

(cosθ)

(3%

Dro

p)

Vol

tage

VS

11.0

kV

Max

imum

Cur

rent

I max

280A

Pow

er fa

ctor

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"

M01(Old Legon 1)

Pow

er S

yste

m A

naly

sis

for S

tep

A -

Pow

er S

yst