摘要
为了研究电力机车受电弓升降过程中电磁脉冲引起空间电磁场环境的变化情况,对无机车的背景环境、机车走行、机车受电弓降弓过程和机车启动受电弓升弓过程4种工况进行现场功率电平测试.将测试得到的功率电平通过计算转换成对应的电场强度和磁场强度,并与国际非电离辐射防护委员会(ICNIRP)导则规定的职业暴露限值进行对比.结果表明:受电弓升弓过程电磁脉冲功率电平峰值(-24.30dBm)出现在频率458MHz处,对应的电场强度为2.02×10^-1V/m,磁场强度为5.37×10^-4A/m;受电弓降弓过程电磁脉冲峰值出现在频率144MHz处,对应的功率电平为?29.47dBm,电场强度为3.51×10^-2V/m,磁场强度为9.31×10^-5A/m;空间的电场强度和磁场强度最大值出现在受电弓升弓过程中,两者最大值均远小于ICNIRP规定的职业暴露限值.研究结果表明,电力机车整备场现场作业人员在受电弓升降弓过程中产生的电磁辐射环境中工作是安全的.
This study examines changes in an electromagnetic environment caused by an electromagnetic pulse during lifting and dropping of pantograph.The following four working conditions were tested:a background environment with no locomotive,the running of a locomotive,and the two processes of lifting and dropping of pantograph.The measured power levels were converted into corresponding electric and magnetic field strengths and were compared with the occupational exposure limits defined in International Commission on Non-Ionizing Radiation Protection(ICNIRP)guidelines.The results showed that the peak value of an electromagnetic pulse during pantograph lifting appeared at a frequency of 458 MHz,the corresponding power level was-24.30 dBm,the electric field intensity was 2.02×10^-1 V/m,and the magnetic field intensity was 5.37×10^-4 A/m.The peak value of an electromagnetic pulse during pantograph dropping was presented at a frequency of 144 MHz,at a corresponding power level of-29.47 dBm,electric field intensity of 3.51×10^-2 V/m,and magnetic field intensity of 9.31×10^-5 A/m.The maximum electric and magnetic field intensities occurred during pantograph lifting,and their values were far smaller than the ICNIRP occupation exposure limits.The results thus indicate that the electromagnetic radiation environment generated by lifting and dropping of the pantograph is safe to occuptational workers.
作者
阳长琼
逯迈
周文颖
张启
YANG Changqiong;LU Mai;ZHOU Wenying;ZHANG Qi(Key Laboratory of Opto-Electronic Technology and Intelligent Control,Ministry of Education,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《辐射研究与辐射工艺学报》
CAS
CSCD
2019年第4期45-51,共7页
Journal of Radiation Research and Radiation Processing
基金
国家自然科学基金(51567015、51867014)
兰州交通大学青年基金项目(2015031、2017040)资助~~
关键词
受电弓
电磁脉冲
功率电平
电场强度
磁场强度
Pantograph
Electromagnetic pulse
Power level
Electric field strength
Magnetic field strength
