Eliminating Ferro-resonance for Distribution Network with Different Neutral Grounding Modes

ZHOU Mo; SUN Yanzhou

doi:10.13296/j.1001-1609.hva.2015.01.014

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Eliminating Ferro-resonance for Distribution Network with Different Neutral Grounding Modes

更新时间：2025-04-26

- Eliminating Ferro-resonance for Distribution Network with Different Neutral Grounding Modes
- High VoltageApparatus Vol. 51, Issue 1, Pages: 80-85(2015)
- 作者机构：
  
  河南理工大学电气工程与自动化学院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2015.01.014
  CLC： TM864
- Published：2015
- 稿件说明：
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[1]周默,孙岩洲.电网中性点不同接地方式下铁磁谐振的消谐研究[J].高压电器,2015,51(01):80-85.

ZHOU Mo, SUN Yanzhou. Eliminating Ferro-resonance for Distribution Network with Different Neutral Grounding Modes[J]. High voltageapparatus, 2015, 51(1): 80-85.
[1]周默,孙岩洲.电网中性点不同接地方式下铁磁谐振的消谐研究[J].高压电器,2015,51(01):80-85. DOI： 10.13296/j.1001-1609.hva.2015.01.014.

ZHOU Mo, SUN Yanzhou. Eliminating Ferro-resonance for Distribution Network with Different Neutral Grounding Modes[J]. High voltageapparatus, 2015, 51(1): 80-85. DOI： 10.13296/j.1001-1609.hva.2015.01.014.

摘要

在10 k V配电网中

电磁式电压互感器（TV）在一定条件下易产生铁磁谐振过电压

这严重影响了系统的安全运行。笔者通过JDZX9-10型与JSZW-10型电压互感器励磁特性的对比实验

获得了数字仿真所需的电压互感器励磁特性数据

并利用MATLAB建立了10 k V配电网由单相接地故障而引发铁磁谐振的模型。通过理论分析、对比实验和数字仿真可得

对于10 k V中性点经消弧线圈接地模型

TV开口三角绕组接阻尼电阻对铁磁谐振的抑制具有最明显的作用;而10 k V中性点经小电阻接地模型能够很好地对铁磁谐振进行消除;对于10 k V系统中性点不接地模型

TV高压侧中性点串非线性电阻则是预防或消除铁磁谐振的一种十分有效的方法。

Abstract

In the 10 k V distribution network

the electromagnetic voltage transformer（EMVT）is prone to causing ferro-resonance induced over-voltage under certain condition to seriously harm safe operation of the distribution system.The authors conducted experiments to compare the exciting characteristics of the JDZX9-10 and JSZW-10 EMVTs

hence the data of the exciting characteristics were obtained for numerical simulation.In addition

a model of ferro-resonance caused by single-phase grounding fault in the 10 k V distribution network was established via MATLAB.Theoretical analysis

comparative experiments and numerical simulation reveal that: 1)For the model of neutral point grounding through Petersen coil

the best ferro-resonance suppression can be gained by connecting EMVT’s open delta winding with a damping resistor; 2)The model of neutral point grounding via low resistance can gain better ferro-resonance suppression; and 3)For the model of 10 k V neutral ungrounded system

it is a very effective method to connect a nonlinear resistor in series with the neutral point at high-voltage side of EMVT for prevention or elimination of ferro-resonance.

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