500kV自耦变压器中性点经小电抗接地系统的过电压与绝缘配合

Analysis of Overvoltage and Insulation Coordination in the System of 500kV Autot-ransformer Neutral Grounding by Small Reactance

在500kV自耦变中性点由直接接地改成经小电抗接地的方式后,对其中性点、主变入口处上出现的过电压进行了详细全面的分析,并在此基础上对中性点电抗器的小电抗取值、主变中性点和主变入口处的过电压保护和绝缘配合问题进行了探讨。

The general analysis is focused on insulation level of the autotransformer neutral and the entrance of the autotrans-former after small reactance grounding. In addition, the impedance value of the small reactance, the protection of the neutral and autotransformer entrance, and insulation coordination is particular discussed.