
אא
W
אא
Three Phase Transformers
W
אא
אאאאא
F
אא
אא
E
אאאא،
אא
א
K
א
א
אאא
אאאאא
אא
אאא
K
א
א
אא
אא
א
K
٥
J
١
אא
א
א
א
אא
K
אא
אאאאא،א
א
K
אאאא
אאאאאא
א
K
٥
J
١
א
K
٥
J
١
א

אאאאא
א א א א א אא א
אאאאאאאא
א
،אא
א
אאאא
א
אאאא
F
א
KE
٥
J
١
J
١
אא
W
Core type
אאא
אאאא
٠٠٥kVA
٠٠١MVA
K
٥
J
٢
אא،א
א،א
א
אא
K
٥
J
٢
אא

٥
J
١
J
٢
אא
F
א
WE
Shell type
א אא א א א א א
K
٥
J
٣
אא،א
،א
٥
J
٣
،אאא
אא
א
אא،אאא
א
K
٥
J
٣
אא
F
א
E

א
א
א
אאא
core and shell type transformer
،
א
א
K
٥
J
٤
אא
٥
J
٤
٥
J
٢
א
אאאאאא
،אאאא
א
אא
א
א
אא
אאאאאאאא
אאאא،אא
א
F
KE
אאאאאאא
א
אאא
(phase shift)
K
אא
אא
W
J
אא
J
א
Star-Star Y-Y
J
אא
–
א
∆-∆
Delta-Delta
J
אא
–
א
Y-∆
Star-Delta
J
אא
–
א
∆-Y
Delta-Star

٥
J
٢
J
١
J
Y-Y
٥
J
٥
א
J
،
אא
Y
א
Y
K
٥
J
٥
Y-Y
א
J
אא
W
K
א
)
(
א
)
(
א
אאאאאאאאא
K
K
אאאאאא
אאא
K
K
א
א
J
א
K
K
אא
K
K
א א א ،א א א
(Third-
harmonic)
אאאא،א
אא،אא
א
K
א א א א א
K

K
א
א
אא
אאא
W
= = =
אאא
J
אא
א
K
אא
אאאאאאא
א
K
٥
J
١
א
א
א
L
א א
٦٦
٦{٦
K
א
אאאאאא
٠٠٠١
J
٦{٦
א
= =
=
S =
V
٢
I
٢
I
٢
=
=
٧٨{٤٧٧
Amp.
= =
=
I
١
=
٨{٧٤٤
Amp.
٥
J
٢
J
٢
J
∆-∆
،אאא
אא
א
،
٥
J
٦
K
אאא
א
א
אא
א
א
K

٥
J
٦
∆-∆
אאא
אא
W
K
אאאא
אא
)
(
א
)
(
אאא
אאאאאאא
K
K
א
א
J
אאא
א
אא
K
ت
.
אאאאא
א
א
א
K
ث
.
אא
א
K
ج
.
אאאא
K
אא
אא
אאא
W
= =

אאא
J
א
אאאא،א
٥
J
٢
א
L
٣١{٨
٠٥١
K
א
אא
אא
א
אאאאאאאא
א
אא
אא
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א
= =
=
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V
١
=
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kV
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ph
=
=
=
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= =
=
Amp.
I
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ph
=
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I
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= I
١
ph
=
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Amp.
٥
J
٢
J
٣
J
Y-∆
א
א
א
א
٥
J
٧K

٥
J
٧
J
J
אא
W
K
א
א
א
אאא
אאאא
K
א
אאא
K
אאאאאאאאא
K
K
א
J
אא
K
K
א
J
אא
אאאאא
K
אא
אא
אאא
W
=
⇒
=
=
⇒ =
٥
J
٢
J
٤
J
∆- Y
א
אא
א
K
٥
J
٨
אא
K

٥
J
٨
J
א
J
א
W
K
א
אא
אא
אאא
אאאא
K
א א א א
אאא
אאאאא
K
אא
אא
אא
K
K
אאאאא
א
K
K
א
J
א א
א
K
K
אא
אא
אאא
W

=
⇒
=
=
⇒ =
٥
J
٣
K
אא
אא
F
אא
E
א
אא
א،אא
א
٥
J
٩
אאא
K
٥
J
٩
אאא
א א אא א
א
F
J
א
E
F
א
J
E
F
J
א
E
F
א
J
E
א
K
٥
J
٠١
א
J
אא
K

٥
J
٠١
א
J
٥
J
٣
K
אאאא
٥
J
٤
J
١
אאא
Phasor diagram-Vector group
א
phasor diagram
א
א
א،א
אא
אא
،א
א א אא א אא
F
א
E

אאא
٠٨١
o
אא
א
א
אא
אאא
٠٦٣
o
א
٠٣
o
אא
אא
א
א
K
אאא
אא
F
–
–
א
E
אאא
٠٣
o
א
א
אא
،אאאאא
אאאאאאאא
אא
K
אא
Dz
٠
א
א
א
F
א
אא
E
אאא
F
אאא
E
אאאאאאאאאאאא
א ،
K
، א
אא
א
אא
א
א
W
١K
אא
W
אא
א
אא
W
K
٠
Dd
אאאאאאא
٥
J
١١
אאא
K
٠
Yy
אאאאאאא
٥
J
٢١
אאא
K
٠
Dz
אאאאא
אאאא
٥
J
٢١
אאא

٥
J
١١
٠
Dd
٥
J
٢١
٠
Yy

٥
J
٣١
٠
Dz
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א
א
W
אא
א
o
٠٨١
אא
K
٦
Dd
אאאאאאא
٠٨١
o
٥
J
٤١
א
אא
K
٦
Yy
אאאאאאא
٠٨١
o
٥
J
٥١
אאא
٦
Dz
אאאאא
א
אאא
٠٨١
o
٥
J
٦١
אאא

٥
J
٤١
٦
Dd
٥
J
٥١
٦
Yy

٥
J
٦١
٦
Dz
٣K
א
א
W
אא
א
o
٠٣
אא
K
١
Dy
אאאאאא
אא
٠٣
o
٥
J
٧١
אאא
K
١
Yd
אאא
אאא
אא
٠٣
o
٥
J
٨١
אאא
K
١
Yz
אאא
אא
אאאא
٠٣
o
٥
J
٩١
אאא

٥
J
٧١
١
Dy
٥
J
٨١
١
Yd

٥
J
٩١
١
Yz
٤K
א
אא
W
א א
א
o
٠٣٣
٠٣
אא
W
K
١
١
Dy
אאאאאא
אא
٠٣٣
o
٥
J
٠٢
אאא
K
١
١
Yd
אאאאא
אאא
٠٣٣
o
٥
J
١٢
אאא
K
١١
Yz
אאא
אא
אאאא
٠٣٣
o
٥
J
٢٢
אאא

٥
J
٠٢
١١
Dy
٥
J
١٢
١١
Yd

٥
J
٢٢
١١
Yz
٥
J
٤
J
٢
אאאא
Parllel Operation of Three Phase Transformer
אאאא
אא
אא،אאא
אאאאא
K
אאא
אא
א
K
א
אא
K
٥
J
٥
א
Methods of Cooling
אא
אא
א
K
אא
אאאא
אאאא
א
אא
אאא
K
א
א
א

אא
K
א
אאאאא
א
אא
K
אא
א
אאאאא
א
K
W
٥
J
٥
J
١
אא
W
Cooling of Dry Type Transformer
אאאאא
(self-cooled)
אא
אאאאאא
א
(KVA)
٥١kV
א،
א
AN
אא
Air Natural
אאאאא
אאאאאא
אא
א
(Self-cooled with forced-air cooling)
אאא
AF
א
Air Forced
٥
J
٥
J
٢
אאא
W
Cooling of liquid immersed Transformer
א
א ،א אא א
،א
(container)
K
אא
W
K
א
W
Oil immersed, self cooled
א
אאאאא
K
א
אאאא
א
F
E
אאאא
א א א א
א א
،
א
א
K
٥
J
٣٢
אאא
F
E
،
א
K
אא
אאא
٥
J
٤٢
K
אא
ON
א
Oil Natural

٥
J
٣٢
אא
٥
J
٤٢
אא

K
א
א
Oil immersed, self cooled/forced-air cooled
אא
א
א
K
٥
J
٥٢
א
K
אאאאאא
K
אא
ONAF
א
Oil Natural Air Forced
٥
J
٥٢
אא
K
א
Oil immersed, self cooled/forced-air cooled
אאאאאא
אאאאא
א
K
אאאאאא
אא
K

אאאאא
אאאא
אאאאאאא
K
אאאא
אאאא
W
א
אא
אאא
K
א
OFWF
Oil Forced Water Forced
אא،
א
ONAN/ONAF
٥
J
٦
א
Power Transformer
א
(Power Tansformers)
אא
א א א א א א
Step up
transformer
א
אאא
א א
א
K
א
א
א
(Step down transformer)
א
א
K
אאאאא
٠٠٠٥kVA
אאאא
٠٠٨kV
אא
אאאא
K
٥
J
٦
J
١
א
א
אאאאאאא
אאא
K
אאאא
א
אאאא
א א
K
אא אא
אאאאא אאא
א
K
אאאא
א
K

٥
J
٦٢
אא
Low Voltage Bushing

אאאא
א
א
אאא
אא
(Bushinges)
אא
אאא
K
אאאא
(Bushinges)
٥
J
٦٢
אאא
אא
K
אאאא
אאא
אאא
אא
W
•
אאאא
٥٠١
•
א
אאא
א
٠٥١
•
אא
אאא
٠٩١
K
•
אאאא
•
אאאאא
K
٥
J
٦
J
٢
א
אאאאאא
א،אאאאא
אאאאאא
K
אאא
،א א א אא אא אא
א
K
אא
K
٥
J
٧٢
٥
J
٨٢
K

٥
J
٧٢
א
٥
J
٨٢

٥
J
٦
J
٣
א
אאאאאא
אאאא
אאא
K
א
אאאא
١٠٥kVA
٠٠١MVA
אאאאאאאאא
אא
K
٥
J
٦
J
٤
א
א א א
،א א א
אאאא
W
•
אא
א
אאאאא
א
K
•
אא
K
אאא
א
אאאאאאא
F
אאא
א
E
אאאאאאא،
א
K
•
אאאאא
F
א
–
א
E
א
אאאא
אא א א
ducts
א
K
א א א א א אא א אא
א
אא
K
אא
אאאאא
W
١K
א
W
אאאאאא
٢K
א
W
א
٥٩٨kg/m
٣
٣K
א
W
אאאא
K

٤K
א
W
א אא א א א א
א
אאא
א
K
א
א
אא
אא
٥K
א
W
א
א
K
א
٠٣
אא
אא
٥٤
אאאא
K
٦K
א
W
א
א
א
،א
א
٠{٠٦
٪
אאאאאא
K
א
א
٥٣
אא
K
٧K
אא
W
אאא
K
א
אא
٠٣kV
א
٠٥kV
K
٨K
אאא
W
אאאא
אאאא
٠{٠٠٥
א א א
א א
אאא
F
אא
E
،
א
אאא
٥
J
٦
J
٥
א
אא
א
K
א א
אאאאאאאא
אאאא
א
K
א
א،אא
אאאא
،א
א
א
אא
K
אא
אאא،א
אא
K
אאאא
א
א
א
א
،אאאאא

א
אאא
אאאאאא
אא
K
א
א
אאא
K
٥
J
٦
J
٦
אא
אא א
W
א
א
א
K
•
אאא
W
Step Up Transformer
אאא
אאא
אאא
٠٠٨kV
K
אא
L
K
אא
א
אא
אאא
٧٥{٧
٪
א ، א
K
אאא
אאאאאאא
אאאאאא
אאא
א
אאא
אא
אא
אאא
א
K
א א א
F
א א
E
א
אאאאאאא
K
אאאאאא
W
١K
אא
אאא
א
F
א
א
אא
E
Circuit Braker)
EK

٢K
א
א
א
א א א
א
אאאאא
אא
אא
F
אא
E
א
K
٣K
אאאא
(duct)
א
א
א
א
٥
J
٩٢
א
٠٠١١MVA
٩١L٣٤٥ kV
אא
٥
J
٩٢
אאא
•
א
א
W
Step Down Transformer
אא
א
אא
אא
(On Load Tap Changer)
א
٪٥١
א
١
٪
٥
K٪
אא
א،אאאאא
א
אאא

٥
J
٧
א
Distribution Transformer
אאאאאאא
אאא
K
א
א
W
אא
אאאא
K
٥
J
٧
J
١
אא
Large Distribution Transformer
אאאאאאאא
א א
א א א א
٠٠٠٥kVA
٠٢MVA
אאא
٢٧{٥ kV
א
אאאאאאא
אא
אאאא
K
אא
K
٥
J
٠٣
א
אא
٥
J
٠٣

٥
J
٧
J
٢
אא
Meduim Distribution Transformer
אאאאאא
٠٠٠٥kVA
אאא
٦٣kV
אאאא
א
אאאאא
אא
K
אאאאאא
אאאאאאא
K
٥
J
٧
J
٣
אא
Small Distribution Transformer
אאאאאאא
א
٥
J
١٣
א
٥
J
٢٣
א
אא
K
א
א
אאאא
٥
J
١٣
א

٥
J
١٣
א
٥
J
٧
J
٤
אא
Dry-type Distribution Transformer
א
אאאא
(Indoors)
א
،
א
אא،אאאא
א א א א א א
אא א
א
אאא
אאאא
٠٥MVA
אא
٥٣kV
K
אאאאא
K
אאאאאאא
א
K
אאאאאאאא
W
١K
אא
K
٢K
אא
K
٣K
K
א א אא
א
K
٤K
אאא
K
٥K
אאא
K

٦K
א
אאא
אא
K
٧K
אא
W
١
.
אאא
W
א
אא
،א א א
א א
א
K
א
א
אאאאאא
אאאאא،אא
א א אא א
א
א
א
אא
K
٢
.
אאאא
W
אא
K
אאאא
א א
K
א א
א א
א،אא
א
אאאאאאאאאא
א א א
K
א א
א
א
K
٥
J
٢٣
א
٣
.
אא
W
אאאא
א،
אא
א
K
א
C
٢
F
٦
א
K
אאא
אא
K
אאאא
א
K
א
א
K
אאאא
K
אאאאא
Package unit
אא
א

אאאאא،א
אא
אא
א
K
٥
J
٢٣
א
٥
J
٨
א
F
א
E
Votage Tappings
אאאא
(voltage taps)
אאאאא
אאאאאא
אא
K
א
א
אאאא
א
א
אא
א
א
K
אאא
א א
א
א
אא
F
א
E
א
א
א،אאא
א א א א א אא
K
א
(voltage taps)
אאאא
אאא
F
א
E
K
אאא
אא
אא
אא
K
א

א
٥٩
٪
٠٠١
٪
אא
٢{٥
٪
א
א
K
٥
J
٣٣
אאא
א
K
٥
J
٣٣
٤
٥
J
١
אא
אא
אא
אא
אא
אא
٥
J
٣٣
K
א
אאאא
אאא
א
א
٠٠١
٪
٠٠٤٢
٠٢١
٠٢
٧٩{٥
٪
٠٤٣٢
٠٢١
٩١{٥
٥٩
٪
٠٨٢٢
٠٢١
٩١
٢٩{٥
٪
٠٢٢٢
٠٢١
٨١{٥
אא א א
(Terminal
Board)
٥
J
٤٣
אאא
א
א
(No Load Tap changer)
אא
א
א
(On Load Tap Changer)
אאא
K

٥
J
٤٣
אאאאא
٥
J
٩
אא
Tap Changers
א
אא
אאא
אא
W
٥
J
٩
J
١
א
No Load Tap Changer
אא
א
،א
אא
(Off Load)
K
אאא
א
א
K
א
F
אא
E
א
א
א
K
٥
J
٥٣
א
אא
٥
J
٦٣
א

٥
J
٥٣
אאאא
٥
J
٥٣
אא
١
א
،אאא
אא
٤
א
٥
אא
א
٢
א
א
٤
א
٦
אא
٥
٦
אא
א،אא
K
٥
J
٦٣
א

٥
J
٩
J
٢
אא
On Load Tap Changer
אאאאאא
א
א
אאאאא
K
א
א
א
אאא
אאאא
א
א
א
K
אאאא
א
א
K
א
K
א
א
א
אא
K