Các máy biến áp đặc biệt

 MBA ba dây quấn
 MBA tự ngẫu
 MBA đo lường
 MBA hàn hồ quang
CHƯƠNG 5: CÁC MBA ĐẶC BIỆT
CHƯƠNG 5: CÁC MBA ĐẶC BIỆT

 

3
1 2
2 1 3
T
1
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
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
1
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2
I

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
 !
§1. MBA BA DÂY QUẤN
§1. MBA BA DÂY QUẤN
!"!
 #   
 $% &  
' ( ) *
+
,- + # + 
.

 
/
/ /
0 1

0 1
= =
 
&
& &
0 1

0 1
= =
2345!"6+7
Ưu điểm7
8%9:!"&
;<-=

1>,?@,ABC494
'
26D4=
EFG
H+'
H65AI7
J

KJ

K∆L&L
 J

K∆K∆LL
Nhược điểm
 & / M
N N N N M
& & & &
′ ′
− − = ≈
        
0 O N P QN R O N S
& & & & & &
= + + = +
H9?T9!U7
&
& &

1
N N

1
′
=
/
/ /

1
N N
1
′
=

& &
&
1
0 0
1
′
=

/ /
/
1
0 0
1
′
=
• EVW$X9
•+"7
& & & & & & & & &

0 O N P QN R O N S
& & & & & &
′ ′ ′ ′ ′ ′ ′ ′ ′
= − − = −
/ / / / / / / / /
0 O N P QN R O N S
& & & & & &
′ ′ ′ ′ ′ ′ ′ ′ ′
= − − = −
S

S
:
/
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&
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−
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N
&
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O
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−
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−
ϕ
2
ϕ
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1
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−
&
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0
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&
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&
 
R Y= ω
& &
R Y= ω
/ /
R Y= ω
&  &
S S S
′
= +
&
0



/
 H 6 ?Z S

( S[
&
( S[
/
  \ W C <
+:]:
0

S

&
S
′
/
S
′
/  /
S S S
′
= +
&
0


/
0


S
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&
S
′
/
S
′
&/ & /
S S S
′
= +
&
0

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/
0
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S

&
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′
/
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′
8$%&
?& & \& &

 4  4
∗ ∗
= ϕ + ϕ
& &
?&
:
? N

0
∗
′
=
& &
\&
:
\ N

0
∗
′
=
 /
?/
:
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=

 /
\/
:
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: &
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0 0
0
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′
−
∆ =
?/ / \/ /
 4  4
∗ ∗
+ ϕ + ϕ
•EF6+'7
8$%/
: /
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:
0 0
0

0
∗
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∆ =
?/ / \/ /
 4  4
∗ ∗
= ϕ + ϕ
/ /
?/
:
? N

0
∗
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=
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\/
:
\ N
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 &
?&
:

? N

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 &
\&
:
\ N
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′
=
?& & \& &
 4  4
∗ ∗
+ ϕ + ϕ

0
^
R
0
H
O
&
(N
&
N

H N
^


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O
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15G
0
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0
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
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§2. MBA TỰ NGẪU
§2. MBA TỰ NGẪU
1. Cấu tạo7 2? : !"  _ `(  
49$%'(%:5,A+C
a#:5,A++
0
^
R
0
H
O
&
(N
&
N
H N
^


\
O

(N

0
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O
&
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&

R
0
H
0

O

(N


\
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15
HD4?@U7,%D
4?@C?bE5
$-:!"5G7
0
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&
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&
R
0
H
0
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O


(N


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0
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&
.   & &
c O N O N= =

d H H ^ ^
c 0 N 0 N= =
  

& & &
0 O N

0 O N
= = =
H ^
&
^ H
0 N

0 N
= =
- 345!"6+e
:!"
- 345!"6+,-
•E5$-:!"5G
• E5$-:!"57
. & &
d H H
c O N
c 0 N
=
H ^ H
H H
0 0 N
0 N

−
=
&



= −
. & &
d H H
c O N
c 0 N
=
H ^ ^
H H
0 0 N
0 N
−
=
&
 = −
•!"_`)*5,-+#
+..D@($<BML&&M.f(
&&MLgMM.f$$
2. Ứng dụng
3. Ưu nhược điểm của máy biến áp tự ngẫu
•!"_`)*.-FF
9.DV!FD4,-.
•!"_`)*+
"!W+B
•  !"  _ h ) ?  a 

+:*+6
•!"_`%9:!"

•E+]:=(+?9?:=
•a+]:,-
•2?<U5
•iU>b+
•;D#+$%
•26D4!j
Ví dụ7 F :! _ ` MM.f ( gM^k( llMK&&Mf
:FUV:,a+&&Mf(m.n$%:F
F9m.n(&&Mf(gM^k,%:$+$-oMpD4
W:'(4ϕqMmr$%ηqMmm2<6D4
!* ."   C :!s D 4 !* ."
?@U$%D4!*."!"
HD4BeF97
:

i . mMMM Mo
i mmmn
Mmm
×
= = =
η
HD4U.eF97
 
t i  mmm Mgo/l lmglmf ?= ϕ = × =
HD4!*.",C:!7
& &
 , 

c i i  t= + +
& &
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