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?

2024-12-14 23:15:16
推荐回答(5个)
回答1:

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。

回答2:

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。

回答3:

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

回答4:

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

回答5:

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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