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负荷计算和无功功率计算及补偿

(一) 负荷计算和无功功率计算

在负荷计算时,采用需要系数法对各个车间进行计算,并将照明和动力部分分开计算,照明部分最后和宿舍区照明一起计算。具体步骤如下。 1. 仓库:动力部分 ,

30(11)880.2522P kW kW =⨯=;30(11)22 1.1725.74var Q kW k =⨯=

30(11)33.86S k VA == ; 30(11)

33.8651.451.7320.38k VA

I A kV

==⨯

照明

30(12)20.81

.6P kW kW =⨯=;30(11)0Q = 2. 铸造车间:动力部分,

30(21)3380.35118.3P kW kW =⨯=;30(21)118.3 1.02120.666var Q kW k =⨯=

30(21)168.98S k VA == 30(21)168.98256.751.7320.38k VA

I A kV

=

=⨯

照明部分,30(22)100.88P kW kW =⨯=;30(22)0Q = 3. 锻压车间:动力部分,

30(31)3380.2584.5P kW kW =⨯=;30(31)84.5 1.1798.865var Q kW k =⨯=

30(31)130.06S k VA == 30(31)

130.06197.611.7320.38

k V A

I A kV ==⨯

照明部分,30(32)100.88P kW kW =⨯=;30(32)0Q = 4. 金工车间:动力部分,

30(41)3380.2584.5P kW kW =⨯=;30(41)84.5 1.33112.385var Q kW k =⨯=

30(41)140.61S k VA == 30(41)140.61213.641.7320.38k VA

I A kV

=

=⨯

照明部分,30(42)100.88P kW kW =⨯=;30(42)0Q =

5. 工具车间:动力部分,

30(51)3380.2584.5P kW kW =⨯=;30(51)84.5 1.1798.865var Q kW k =⨯=

30(51)130.06S k VA == 30(51)

130.06197.611.7320.38

k V A

I A kV ==⨯

照明部分,30(52)100.88P kW kW =⨯=;30(52)0Q = 6. 电镀车间:动力部分,

30(61)3380.5169P kW kW =⨯=;30(61)1690.88148.72var Q kW k =⨯=

30(61)225.12S k VA == 30(61)

225.12342.041.7320.38

k V A

I A kV ==⨯

照明部分,30(62)100.88P kW kW =⨯=;30(62)0Q = 7. 热处理车间:动力部分,

30(71)1380.569P kW kW =⨯=;30(71)69 1.3391.77var Q kW k =⨯=

30(71)114.82S k VA == 30(71)

114.82174.461.7320.38k VA

I A kV

==⨯

照明部分,30(72)100.88P kW kW =⨯=;30(72)0Q = 8. 装配车间:动力部分,

30(81)1380.3548.3P kW kW =⨯=;30(81)48.3 1.0249.266var Q kW k =⨯=

30(81)68.99S k VA == 30(81)

68.99104.821.7320.38k VA

I A kV

==⨯

照明部分,30(82)100.88P kW kW =⨯=;30(82)0Q = 9. 机修车间:动力部分,

30(91)1380.2534.5P kW kW =⨯=;30(91)34.5 1.1740.365var Q kW k =⨯=

30(91)53.10S k VA == 30(91)

53.1080.681.7320.38k VA

I A kV

==⨯

照明部分,30(92)50.84P kW kW =⨯=;30(92)0Q =

10. 锅炉房:动力部分,

30(101)1380.569P kW kW =⨯=;30(101)69 1.1780.73var Q kW k =⨯=

30(101)106.2S k VA == 30(101106.2161.361.7320.38k VA I A kV

==⨯ 照明部分,30(102)20.8 1.6P kW kW =⨯=;30(102)0Q = 11.宿舍区照明,30(11)4000.7280P kW kW =⨯=。30(11)0Q =

另外,所有车间的照明负荷:'3063.2P KW =

取全厂的同时系数为:0.95p K ∑=,0.97q K ∑=,则全厂的计算负荷为:

11

'3030(1)3010.95()0.95(1063.663.2)1070.46i i P P P kW

==+=⨯+=∑11

3030(1)1

0.970.97867.372=841.35var i i Q Q k ===⨯∑

301361.53S kV A ==⋅;302068.69I A =

=

(二) 无功功率补偿

由以上计算可得变压器低压侧的视在计算负荷为:301361.53S kV A =⋅ 这时低压侧的功率因数为:(2)1070.46

cos 0.791361.53

φ=

=

为使高压侧的功率因数≥0.90,则低压侧补偿后的功率因数应高于0.90, 取:'cos 0.95φ= 。要使低压侧的功率因数由0.79提高到0.95,则低压侧需装设的并联电容器容量为:

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