为什么中性点不接地的变压器三相绕组中无零序电流,所以其中性点的零序电压一定为0是错的？
推荐回答（5个）
变压器中性点接地是为了保证中性点的电位为始终零。
当供电系统三相负载不平衡或其它原因造成三相电压不平衡时，中性点会发生偏移现象。中性点接地系统中，由此产生的零序电流会通过大地与变压器中性点形成通路，维持三相电压的平衡。
在三相平衡时，没有电流流向大地。同时，不是所有的供电系统都要进行变压器中性点接地，要根据电网系统的性质决定。如：IT系统中，变压器的中性点不予接地，但是TT、TNS、TNC等系统的变压器中性点必须接地的。
因为中性点不接地，则Ia+Ib+Ic=0，无零序电流。当负荷不对称时，Uo一定不为零，所以零序电压一定为零是错的。
不接单地系统x0=∞，电流没有通路。，I0=0。中性点电压不一定为0，因为无通路可以存在开路电压。谢谢
中性点不接地，就没有形成回路，自然没有电流了，而对中性点的电压确不一定没有，同样要看三相矢量计算的结果
零序电压肯定是有的，只不过零序回路的阻抗极大而无零序电流。
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