推荐回答（4个）
1，变压器损耗：{变压器的铁损(W)+变压器的铜损(W)}×变压器计量时长运行小时(H）=计量时长变压器损耗（KWH)。2，其它通称这线损：计量时长变压器总耗电电量（KWH)×3%
变电所损耗分为低压柜损耗，变压器损耗，高压柜损耗，高压柜损耗和低压柜损耗为固定值，变压器损耗根据变压器容量型号来决定，参见样本，可参考 钢铁企业配电手册
由于线路存在着阻抗，所以在负荷电流流过时要产生电流损耗。按规定，高压供电线路电压损耗一般不超过线路额定电压7%，从变压器低压侧母线到用电设备受电端的低压线路的电压损耗一般不超过用电设备额定电压的7%，对视觉要求较高的照明电路则为2-3%，如线路的电压损耗超过了允许值，则应适当增加导线的截面。使之满足电压损耗要求。
电压损耗计算公式： u%=LU%P30
u%——电压损耗的百分数可根据导线截面和负荷功率因数查表求出，
P——线路负荷（KW）
L——线路长度（KM）
还有一个更好用的公式：
ΔU=Σ（pR+qX）/Ue
式中负荷为p+jq R为线路阻抗，X为线路电抗
线路损耗的百分值为：ΔU%=100ΔU/Ue。
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