Study on Neutral Point Grounding Method with Low Reactant for Main Transformers in Xi′an Power Grid

WANG Yu-lu1; WEI Bin2; HAO Xi-wei1; LIU Hai-ying3; ZHANG Guan-jun1

doi:10.13296/j.1001-1609.hva.2010.02.023

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Study on Neutral Point Grounding Method with Low Reactant for Main Transformers in Xi′an Power Grid

更新时间：2025-04-26

- Study on Neutral Point Grounding Method with Low Reactant for Main Transformers in Xi′an Power Grid
- High VoltageApparatus Vol. 46, Issue 2, Pages: 91-94(2010)
- 作者机构：
  
  1. 西安交通大学电气工程学院电力设备电气绝缘国家重点实验室
  2. 西安供电局
  3. 陕西电力设计院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2010.02.023
  CLC： TM862
- Published：2010
- 稿件说明：
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[1]王育路,魏宾,郝西伟,刘海莹,张冠军.西安电网供电主网变压器中性点经小电抗接地的研究[J].高压电器,2010,46(02):91-94.

WANG Yu-lu1, WEI Bin2, HAO Xi-wei1, et al. Study on Neutral Point Grounding Method with Low Reactant for Main Transformers in Xi′an Power Grid[J]. High voltageapparatus, 2010, 46(2): 91-94.
[1]王育路,魏宾,郝西伟,刘海莹,张冠军.西安电网供电主网变压器中性点经小电抗接地的研究[J].高压电器,2010,46(02):91-94. DOI： 10.13296/j.1001-1609.hva.2010.02.023.

WANG Yu-lu1, WEI Bin2, HAO Xi-wei1, et al. Study on Neutral Point Grounding Method with Low Reactant for Main Transformers in Xi′an Power Grid[J]. High voltageapparatus, 2010, 46(2): 91-94. DOI： 10.13296/j.1001-1609.hva.2010.02.023.

摘要

针对目前西安电网中变压器中性点接地方式存在的安全隐患

提出了330 kV自耦变压器和110 kV变压器都经过小电抗接地的优化方式。仿真计算表明

经过适当的小电抗接地后

330 kV自耦变110 kV侧母线上的单相短路电流明显减小

其他110 kV变压器中性点过电压显著减小

保证了中性点绝缘不受威胁和系统运行的安全性。

Abstract

To get rid of the latent danger induced by the current neutral point grounding way of transformers in Xi’an power grid

an optimal grounding method of 330 kV auto-transformers and 110 kV transformers through a low reactance is proposed.The simulation results reveal that after grounding through low reactance with appropriate value

the single-phase grounding short-circuit current on the 110 kV bus-bar of 330 kV auto-transformer decreases clearly

and the over-voltage on neutral point of other 110 kV transformers is significantly reduced to a lower level

which guarantee safe insulation of neutral point and enhance reliability of the power grid.

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