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Research on Improvement in Accuracy of Measurement by Digital Technique under High Electromagnetic Environments

强电磁环境下数字技术提高测量精度的研究

基本信息

批准号：
60850050
负责人：
KAWAMURA Tatsuo
金额：
$ 7.1万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60850050/
关键词：
High Voltage Impulse Voltage Electromagnetic Compatibility ディジタル計測

项目摘要

For the purpose of improving accuracy in measurements using digital technique under high electric and magnetic fields, evaluation of electric and magnetic fields themselves is essential. Through the measurement of electromagnetic fields in the vicinity of a small impulse generator by using electric and magnetic field sensors with the frequency bandwidth of 100MHz, assessment of these fields and development of a measuring system have been carried out.Electric and magnetic fields due to the natural lightning on the Japan Sea side of Honshu island have been recorded using an automatic digital data acquisition system. The authors obtained a lot of data on electric and magnetic fields in winter, which had scarcely been available in the world due to the small number of occurrence.Comparative measurements by analog and digital technique on power-frequency electric field exposure of a human body, current through a human body due to electrostatic induction of power frequency, surge current thro … More ugh polluted insulators, high frequency current generated in a gas insulated switchgear have been carried out. These are the phenomena in high electromagnetic fields under a transmission line or in the vicinity of a gas insulated switchgear. Signal transmission by optical methods has been shown to be very effective for the purpose of precise measurement using digital techniques. Under high electromagnetic fields, only this method can avoid the deterioration of measuring accuracy.Theoretical and experimental investigations on the measuring accuracy of A/D converters, which have the greatest influence on the accuracy in measurements using digital technique, have been carried out. The result shows large variation among each instrument and few instruments assure the accuracy predicted theoretically.Based on the above results, a standard digital measuring system under high electromagnetic fields has been manufactured for trial which served for an experiment performed in a large high voltage laboratory. Based on the results of the experiment, standardization of a digital measuring system has been investigated.Based on the results of this research, further investigations aiming identification of test conditions and standardization of the test method will be carried out bearing in mind robustness of the measuring and control systems to these field conditions. Less

为了提高在高电场和磁场下使用数字技术进行测量的精度，必须对电场和磁场本身进行评估。通过使用频率带宽为100 MHz的电场和磁场传感器测量小型脉冲发生器附近的电磁场，对这些场进行了评估并开发了测量系统，使用自动数字数据采集系统记录了本州岛日本海一侧的自然闪电产生的电场和磁场。作者获得了大量的冬季电场和磁场资料，这些资料在世界上很少得到。本文用模拟和数字技术对人体工频电场暴露、工频静电感应电流、工频冲击电流、工频电场强度、工频电场 ...更多信息研究了气体绝缘开关设备中产生的高频电流对绝缘子的污染情况。这是在输电线路下或气体绝缘开关设备附近的高电磁场中的现象。通过光学方法的信号传输已被证明对于使用数字技术的精确测量是非常有效的。在强电磁场条件下，只有这种方法才能避免测量精度的下降，本文对数字测量中影响精度最大的A/D转换器的测量精度进行了理论和实验研究。结果表明，各仪器之间的测量误差较大，理论预测的测量精度在少数仪器可以保证.在此基础上，研制了一套标准的高场强数字测量系统，并在某大型高压实验室进行了试验.在此基础上，对数字测量系统的标准化进行了研究，并在此基础上进一步研究了测量和控制系统对现场条件的鲁棒性，以确定测试条件和测试方法的标准化。少