发电厂的设计毕业论文

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发电厂的设计毕业论文

第一章主变及所用变的选择

第一节主变压器的选择

一、负荷统计分析

1、35kV侧

Q

1max=

var

44

.

6197

10000

85

.0/

10000

cos

/2

2

2

max

1

2

1

2

max

1

2K

P

P=

-

=

-

ϕ

Q

2max=

var

44

.

6197

10000

85

.0/

10000

cos

/2

2

2

max

2

2

2

2

max

2

2K

P

P=

-

=

-

ϕ

Q

3max =

var

47

.

3718

6000

85

.0/

6000

cos

/2

2

2

max

3

2

3

2

max

3

2K

P

P=

-

=

-

ϕ

Q

4max =

var

4500

6000

80

.0/

6000

cos

/2

2

2

max

4

2

4

2

max

4

2K

P

P=

-

=

-

ϕ

Q

5max =

var

4500

6000

80

.0/

6000

cos

/2

2

2

max

5

2

5

2

max

5

2K

P

P=

-

=

-

ϕ

∑35P=P1max+P2max+P3max+P4max+P5max=10000+10000+6000+6000+6000=38000(KW) ∑35Q=Q1max+Q2max+Q3max+Q4max+Q5max

=6197.44+6197.44+3718.47+4500+4500=25113.35(KVar)

S

35MAX =2

max

35

2

max

35

Q

P+=2

235

.

25113

8000

3+=45548.66(KVA)

35ϕCos =

MAX

S P

35max

35∑=

66

.4554838000

=0.83

考虑到负荷的同时率,35kV 侧最大负荷应为: S ’35MAX =S 35MAX ⨯35η=45548.66⨯0.85=38716.36(KVA)

2、10kV 侧: Q 1max=var 36.1549250085.0/2500cos /222max 1212max

12

K P P

=-=-ϕ

Q 2max =var 49.1239200085.0/2000cos /222max 2222max 22K P P =-=-ϕ Q 3max =var 1125150080.0/1500cos /222max 3232max 32K P P =-=-ϕ Q 4max =var 49.1239200085.0/2000cos /222max 4242max

42

K P P

=-=-ϕ

Q 5max =var 1500200080.0/2000cos /222max 5252max

52

K P P =-=-ϕ Q 6max =var 74.619100085.0/1000cos /222max 6262max

62

K P P =-=-ϕ Q 7max =var 750100080.0/1000cos /222max 7272max

72

K P P =-=-ϕ Q 8max =var 620100085.0/1000cos /222max 8282max

82

K P P =-=-ϕ Q 9max =var 1125150080.0/1500cos /222max 9292max

92

K P P

=-=-ϕ Q 10max =

var 62.929150085.0/1500cos /222max 102102max

102

K P P

=-=-ϕ

∑10

P

=P 1max +P 2max +P 3max +P 4max +P 5max + P 6max +P 7max +P 8max +P 9max +P 10max

=2500+2000+1500+2000+2000+1000+1000+1000+1500+1500=16000(KW )

∑10Q = Q

1max

+Q 2max +Q 3max +Q 4max +Q 5max +Q 6max +Q 7max +Q 8max +Q 9max +Q 10max

=1549.36+1239.49+1125+1239.49+1500+619.74+750+620+1125+929.62=10697.7(KVar )

S 10MAX =∑+∑2

max 102max 10Q P =27.10697216000+=19246.84(KVA ) 10ϕCos =

MAX

S P

1010

∑=

84

.1924616000

=0.83

考虑到负荷的同时率,10kV 侧最大负荷应为:

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