Effect of DC Bias on the On-board Potential Transformer of CRH and Improvement Measures

LIU Ying; NI Zenghua; ZHU Zhongchao; FU Jianmin; XUE Lianmin

doi:10.13296/j.1001-1609.hva.2020.07.035

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Effect of DC Bias on the On-board Potential Transformer of CRH and Improvement Measures

更新时间：2025-04-26

- Effect of DC Bias on the On-board Potential Transformer of CRH and Improvement Measures
- High VoltageApparatus Vol. 56, Issue 7, Pages: 234-238(2020)
- 作者机构：
  
  中车唐山机车车辆有限公司
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2020.07.035
  CLC： U266
- Published：2020
- 稿件说明：
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[1]刘英,倪增华,朱忠超,符建民,薛莲敏.直流偏磁对动车组车载电压互感器的影响及改善措施[J].高压电器,2020,56(07):234-238.

LIU Ying, NI Zenghua, ZHU Zhongchao, et al. Effect of DC Bias on the On-board Potential Transformer of CRH and Improvement Measures[J]. High voltageapparatus, 2020, 56(7): 234-238.
[1]刘英,倪增华,朱忠超,符建民,薛莲敏.直流偏磁对动车组车载电压互感器的影响及改善措施[J].高压电器,2020,56(07):234-238. DOI： 10.13296/j.1001-1609.hva.2020.07.035.

LIU Ying, NI Zenghua, ZHU Zhongchao, et al. Effect of DC Bias on the On-board Potential Transformer of CRH and Improvement Measures[J]. High voltageapparatus, 2020, 56(7): 234-238. DOI： 10.13296/j.1001-1609.hva.2020.07.035.

摘要

动车组车载电压互感器被用来测量和传输动车组牵引电力系统的电压和频率

以保证其在运行中能够实施精确控制动车组牵引电机。由于地磁风暴、四象限斩波器在变流器中的应用、直流输电的单极运行、高空核电磁脉冲等原因

互感器运行过程中会产生直流偏磁现象

该现象会引起互感器谐波分量增加、无功损耗增加、铁心叠片的涡流损耗和铜损增加、铁心磁滞伸缩效应加剧以及振动和噪声加剧等

严重威胁动车组列车运行安全。总结了当前抑制电压互感器中的直流偏磁的措施主要包括注入反向电流法、中性点串联电容法、中性点串联电阻法、中性点串阻容法、线路串电容法、电位补偿法等方法。对运行中的动车组牵引电机实施精确控制具有一定的指导意义。

Abstract

The on-board potential transformer of CRH is used to measure and transmit the voltage and frequency of CRH

so as to ensure that it can accurately control the traction motor of CRH in operation. The DC component in the excitation current of transformer caused by geomagnetic storm

unipolar operation of HVDC transmission and high altitude nuclear electromagnetic pulse leads to DC bias of transformer. This phenomenon will cause the increase of harmonic component and reactive power loss. This phenomenon will lead to the increase of harmonic component

reactive power loss

eddy current loss and copper loss of core laminates

aggravation of hysteresis and expansion effect of core

and aggravation of vibration and noise. Current measures to suppress DC bias in voltage transformers mainly include injection reverse current method

neutral point series capacitance method

neutral point series resistance method

neutral point series resistance and capacitance method

line series capacitance method

potential compensation method

etc.

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