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[1]刘道生,刘 宁,叶 敬,等.换流变压器在多参数下的油流带电现象及其对击穿强度影响[J].高压电器,2020,56(02):122-127.[doi:10.13296/j.1001-1609.hva.2020.02.018]
 LIU Daosheng,LIU Ning,YE Jing,et al.Phenomenon of Oil Flow Static Electrification and Its Influence on Breakdown Strength of Converter Transformer Under Multi Parameters[J].High Voltage Apparatus,2020,56(02):122-127.[doi:10.13296/j.1001-1609.hva.2020.02.018]
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换流变压器在多参数下的油流带电现象及其对击穿强度影响()
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《高压电器》[ISSN:1001-1609/CN:61-11271/TM]

卷:
第56卷
期数:
2020年02期
页码:
122-127
栏目:
研究与分析
出版日期:
2020-02-14

文章信息/Info

Title:
Phenomenon of Oil Flow Static Electrification and Its Influence on Breakdown Strength of Converter Transformer Under Multi Parameters
作者:
刘道生123 刘 宁1 叶 敬1 李家晨1 王仕会1
(1. 江西理工大学电气工程与自动化学院, 江西 赣州 341000; 2. 浙江大学电气工程与自动化学院, 杭州 310058; 3. 三变科技股份有限公司, 浙江 台州 317100)
Author(s):
LIU Daosheng123 LIU Ning1 YE Jing1 LI Jiachen1 WANG Shihui1
(1. School of Electrical Engineering and Automation, Jiangxi University of Science and Technology, Jiangxi Ganzhou 341000, China; 2. School of Electrical Engineering and Automation, Zhejiang University, Hangzhou 310058, China; 3. Sanbian Science and Technology Ltd., Co., Zhejiang Taizhou 317100, China)
关键词:
变压器油 纸板 油流 静电 换流变压器 击穿场强
Keywords:
transformer oil pressboard oil flow electrostatic converter transformer breakdown strength
DOI:
摘要:
大容量和超高压变压器主要采用强迫油流循环传热与散热方式。为了进一步揭示油流静电现象对该种散热方式的变压器的危害,文中建立了油流带电测试平台。在测试过程中,研究了变压器油在不同温度、流速和施加交直流电压对新的和干燥的变压器油击穿场强的影响。实验结果表明,强迫油流循环系统中,流动的变压器油的带电量随温度升高和流速的增加而增加,在温度为50 ℃,出现拐点,即温度高于50 ℃,变压器油的带电量随温度升高而减小;施加直流电压时,变压器油流电流随流速增加而增加,当流速为6.9 m/s时,变压器油流带电的极性发生反转。油流静电现象会导致油的击穿场强降低。因此,应采取有效措施来抑制特高压换流变压器的油流带电引起的危害。
Abstract:
Forced convection of insulation oil is the main heat transfer mode in large-power and ultra-high voltage (UHV) transformer. In order to further reveal the harm of electrostatic phenomenon of the oil flow to this type of transformer, this research established an oil flow testing platform. Oil flow electrification was measured on this platform, and the influences of oil temperature, flow velocity and applied electric field on the breakdown strength of fresh and dry transformer oil were investigated. The results show that: 1) the current in the oil flow increases with the increase of the temperature when the temperature is below 50 ℃, but it reverses when the temperature is above 50 ℃; 2) under DC voltage the current in the oil flow increases with the increase of the flow velocity, while the polarity of the current reverses at the flow velocity of 6.9 m/s; and 3) the oil electrification phenomenon may lead to reduction of the breakdown strength of the oil. It is suggested that some countermeasures should be taken to restrain the possible harm caused by oil flow electrification in UHV converter transformer.

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备注/Memo

备注/Memo:
收稿日期:2019-09-09; 修回日期:2019-11-07基金项目:国家自然科学基金项目资助(51767008);江西省自然科学基金项目资助(20171BAB206043)。Project Supported by National Natural Science Foundation of China(51767008),National Natural Science Foundation of Jiangxi Province(20171BAB206043). 刘道生(1976—),男,博士(后),高工,硕士生导师, 主要从事电气绝缘、高电压、电介质、电磁场数值计算、新能源发电关键技术等方面的教学与研究工作。刘 宁(1993—),男,硕士研究生,主要从事电力设备电气绝缘研究工作。
更新日期/Last Update: 2020-02-14