变压器电容补偿如何计算

2024-11-27 07:15:22
推荐回答(5个)
回答1:

2500KVA的变压器,如果不投电容器,可带负荷最大只有2500*0.8=2000KW。
这时的有功负荷是2000KW,功率因数0.8,无功负荷是1500KW。
如果电容器全部投入运行,则无功负荷降至1500-2*10*30=900KVAR。功率因数提高到了0.91,能带负荷最大可以提高到2500*0.91=2275KW。
考虑到变压器只有在90%负载率时效率最高,应将可用负荷降低约10%

回答2:

简单算法补偿变压器容量的20%--30%,但是我一般补偿30%,大一点比较好。例如变压器500KVA,那么变压器的电容补偿为500*0.3=150Kvar,即补偿150Kvar即可。

回答3:

2500/0.4/1.732=3608A 是最大电流

2500*0.85的功率因数=2125KW就是最大功率
最大功率P=根号3*U*I*功率因数=1.732*400*3608*0.85=2125KW

回答4:

按照变压器20%到30%的容量补偿

回答5:

电容补偿计算
一可以通过以下公式计算所需补偿容量:
公式一:Qc=p(√12φ-cos1/√ cosφ- φ-cos12/cosφ)
=p(tgφ1-tgφ)(kvar)
公式二:Qc=P(√-1φcos/√112 -1 φcos/12)
=P(tgφ1-tgφ)(推荐用公式二,计算量小)
式中cosφ1: 补偿前的功率因数
cosφ:你想达到的功率因数
Qc: 所需补偿容量(kvar)
p: 线路总功率(KW)
补偿前的功率因数可以用功率因数表测量,或通过用电量进行计算: 功率因数=有功电度/根号 有功电度平方+无功电度平方
因为有时候,负荷的大小和功率因数确实不好准确计算,所以一般的设计部门就根据变压器的额定容量补30%--40%

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