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§4-1 三相电源 PowerPoint PPT Presentation


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§4-1 三相电源. 对称三相交流电压. 三相交流电压的星形联接. 三相交流电压的三角形联接(略). u A. u B. u C. 0. u A ( t ). t. A. +. x. ω. u B ( t ). B. +. y. u C ( t ). C. +. z. 对称三相交流电压. 正相序. 对称三相交流电压. 对称三相电源特点. 1. 同频、等幅、间隔 120 °. 2. 三相电源的星形联接. 三相电源的星形联接,简称 Y 0 联接,亦称为三相四线制电源。. 无中线的星形联接称为三相三线制电源,简称 Y 形联接。.

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§4-1 三相电源

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4 1

4-1


4 1

uA

uB

uC

0

uAt

t

A

+

x

uBt

B

+

y

uCt

C

+

z


4 1

1. 120

2.


4 1

Y0

Y

A

+

uA

O

uC

uB

+

+

B

C


4 1

phase

line

A

+

uA

O

uC

uB

+

+

B

C


4 1

:Y

:UL= 3UP

300

:UL= 3UP300


4 1


4 1

4-2


4 1


4 1

A

+

uA

O

uC

uB

+

+

B

C


4 1

[] A

A

BC


4 1

A

+

uA

uC

uB

+

+

B

C


4 1

3 380 V M U1 ( )

(a) 220 V(b) 380 V (c) 190 V


4 1


4 1

4-3

PA=UPIPCOSZ

P=3UPIPCOSZ


4 1

4-4

1


4 1

3.3.1:

1

2

3

[]

1 Y


4 1

Y

2


4 1

3 Y


4 1

Y

12

380/220V220V380V21


4 1

23


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