总功率370kw,请问安装多少kvA的变压器，电容补偿柜需要多少千乏才能补偿到0.9功率因数？？？
推荐回答（4个）
电焊机总功率295KW，只是额定值，一般负载率约≤60%，暂载率约≤50%附近，实际长期运行平均功率不足150KW，可根据设备的负载率来确定变压器容量，我认为变压器容量250～315KVA应可满足需求。
平均功率因数一般在0.7附近，电容补偿应取提高到0.95为宜(兼补偿无功变损)。
以功率因数从0.7提高到0.95、变压器容量为315KVA时：
cosφ1＝0.7
sinφ1＝0.71(查函数表得)
cosφ2＝0.95
sinφ2＝0.31(查函数表得)
tanφ＝0.33(查函数表得)
Qc＝S(sinφ1－cosφ1×tanφ)＝315×(0.71－0.7×0.33)≈151(千乏)
还需要提供这些设备的工作时间，进行负荷计算后才能确定变压器容量和补偿容量。
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