Spatial Magnetic Field Distribution on Inter-turn Short Circuit Fault of Iron Core Reactor

QI Weiqiang; CHEN Baichao; DONG Jianpeng; LI Wei; YAO Yuhai; LI Bangyan; MA Lei

doi:10.14044/j.1674-1757.pcrpc.2019.01.016

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Spatial Magnetic Field Distribution on Inter-turn Short Circuit Fault of Iron Core Reactor

更新时间：2024-09-14

- Spatial Magnetic Field Distribution on Inter-turn Short Circuit Fault of Iron Core Reactor
- POWER CAPACITOR & REACTIVE POWER COMPENSATION Vol. 40, Issue 1, Pages: 86-91(2019)
- 作者机构：
  
  1. 国网北京电科院
  2. 武汉大学电气工程学院
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2019.01.016
  CLC： TM47
- Published：2019，
- 稿件说明：
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[1]齐伟强,陈柏超,董健鹏,李伟,姚玉海,李邦彦,马磊.铁心电抗器匝间短路的空间磁场分布[J].电力电容器与无功补偿,2019,40(01):86-91.

QI WEIQIANG, CHEN BAICHAO, DONG JIANPENG, et al. Spatial Magnetic Field Distribution on Inter-turn Short Circuit Fault of Iron Core Reactor. [J]. Power capacitor & reactive power compensation, 2019, 40(1): 86-91.
[1]齐伟强,陈柏超,董健鹏,李伟,姚玉海,李邦彦,马磊.铁心电抗器匝间短路的空间磁场分布[J].电力电容器与无功补偿,2019,40(01):86-91. DOI： 10.14044/j.1674-1757.pcrpc.2019.01.016.

QI WEIQIANG, CHEN BAICHAO, DONG JIANPENG, et al. Spatial Magnetic Field Distribution on Inter-turn Short Circuit Fault of Iron Core Reactor. [J]. Power capacitor & reactive power compensation, 2019, 40(1): 86-91. DOI： 10.14044/j.1674-1757.pcrpc.2019.01.016.

摘要

干式铁心电抗器发生轻微匝间短路时

其短路匝的循环电流可达额定电流的十几甚至几十倍

导致绕组绝缘损坏

但其相电压、电流等电气特征量变化较小

无法作为电抗器匝间保护的可靠判据。本文通过场路耦合有限元仿真分析了铁心电抗器在不同工况下的空间磁场分布

正常工况下

电抗器的漏磁场感应强度较小

空间磁场呈纵向对称分布;故障工况下

空间磁场的不对称程度随短路匝数增加而增大

轴向和径向的不同位置发生故障时空间磁场不对称度差异较大。结合分析结果

提出将电抗器空间磁场的不对称度作为匝间短路的检测判据。

Abstract

In case of slight inter-turn short of dry type iron-core reactor

the circulating current of its short circuit turn can be up to ten or dozens of times

leading to insulation damage of windings.However

it’s such electrical feature variation as phase voltage and current etc is less and cannot be taken as reliable base for the inter-turn protection of reactor.In this paper

the spatial magnetic field distribution of the iron core reactor under different conditions is simulated and analyzed by the field path coupled finite element method.Under normal condition

the magnetic flux leakage induction strength is small and the spatial magnetic field shows longitudinal symmetrical distribution.In case of fault

the asymmetry of the spatial magnetic field increase with the increase of the short circuit turn number and the asymmetry difference of the spatial magnetic field in the fault at different axial and radial positions is bigger.Throughout the comprehensive analysis result

the asymmetry of the spatial magnetic files of reactor is taken as the criteria of inter-turn short circuit.

关键词

匝间短路磁场分布有限元分析分布特性

Keywords

inter-turn short circuitmagnetic field distributionfinite-element analysis（FEA）distribution characteristics

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