[1]刘 英,倪增华,朱忠超,等.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 Voltage Apparatus,2020,56(07):234-238.[doi:10.13296/j.1001-1609.hva.2020.07.035]
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直流偏磁对动车组车载电压互感器的影响及改善措施()
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《高压电器》[ISSN:1001-1609/CN:61-11271/TM]

卷:
第56卷
期数:
2020年07期
页码:
234-238
栏目:
技术讨论
出版日期:
2020-07-20

文章信息/Info

Title:
Effect of DC Bias on the On-board Potential Transformer of CRH and Improvement Measures
作者:
刘 英 倪增华 朱忠超 符建民 薛莲敏
(中车唐山机车车辆有限公司, 河北 唐山 063000)
Author(s):
LIU Ying NI Zenghua ZHU Zhongchao FU Jianmin XUE Lianmin
(CRRC Tangshan Co., Ltd., Hebei Tangshan 063000, China)
关键词:
动车组 车载电压互感器 直流偏磁 影响 改善措施
Keywords:
CRH on-board potential transformer DC bias influence improvement measures
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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备注/Memo

备注/Memo:
收稿日期:2020-01-17; 修回日期:2020-03-28刘 英(1985—),女,高级工程师,主要从事高速动车组列车电气研发等方面的工作。
更新日期/Last Update: 2020-07-25