罗氏线圈若干问题研究

发布时间：2019-04-25 13:02

【摘要】：罗氏线圈作为新型的电流互感器,具有与测量回路电气绝缘,测量频率宽,反应灵敏,体积小巧,测量精度高等优点被广泛应用在电气测量领域。本论文根据罗氏线圈制造企业提出的导致罗氏线圈质量,影响其产业化进程的若干问题开展研究。本论文首先研究了罗氏线圈电流互感器国内外发展状况,以及其测量原理及特点。从理论上分析罗氏线圈的工作特性,等效电路,工作状态,以及频率特性。本论文详细分析新型罗氏线圈：PCB罗氏线圈,对其原理,设计以及工艺进行研究。本论文主要分析了导致罗氏线圈产生误差的电磁干扰、温度变化、被测导线位置偏离线圈中心等因素。通过理论分析电磁干扰对罗氏线圈的影响,给出进行电磁屏蔽以消除的电磁干扰的方法；对温度变化以及被测导线位置偏离线圈中心的情况同样进行了同样理论分析,并使用Ansoft软件仿真,结合能量摄动法,计算罗氏线圈互感系数受上述两种因素的影响状况。将理论分析与仿真结果进行对照,给出减少误差影响的方法。对于温度的影响,互感系数的变化与温度变化成正比,减小温度的影响在于选取热膨胀系数小的骨架材料。对于被测导线位置的偏离,随着被测导线偏离线圈中心,互感系数逐渐减小,需要保持被测导线处于线圈的中心位置以减少误差。论文最后对全文总结和展望,并分析了工作的不足与进一步研究的方向。
[Abstract]:As a new type of current transformer, Roche coil has been widely used in the field of electrical measurement with the advantages of electrical insulation from the measuring loop, wide measurement frequency, sensitive response, small size and high measurement precision. In this paper, several problems which lead to the quality of Roche coil and influence its industrialization process are studied according to the Roche coil manufacturing enterprise. Firstly, this paper studies the development of Roche coil current transformer at home and abroad, as well as its measuring principle and characteristics. The working characteristic, equivalent circuit, working state and frequency characteristic of Roche coil are analyzed theoretically. In this paper, the principle, design and process of the new Roche coil, PCB coil, are analyzed in detail. In this paper, the electromagnetic interference (EMI), temperature variation and the deviation of the measured conductor from the center of the coil are analyzed. The influence of electromagnetic interference on Roche coil is analyzed theoretically, and the method to eliminate electromagnetic interference by electromagnetic shielding is given. The same theoretical analysis of the temperature variation and the deviation of the measured conductor from the center of the coil is also carried out. With the help of the Ansoft software and the energy perturbation method, the mutual inductance coefficient of the Roche coil is calculated to be affected by the two factors mentioned above. The theoretical analysis is compared with the simulation results, and the method to reduce the error effect is given. For the influence of temperature, the change of mutual inductance coefficient is proportional to the change of temperature, and the effect of decreasing temperature is to select the skeleton material with small thermal expansion coefficient. For the deviation of the measured conductor, as the measured wire deviates from the center of the coil, the mutual inductance decreases gradually, so it is necessary to keep the measured wire at the center of the coil to reduce the error. Finally, the paper summarizes and looks forward to the full text, and analyzes the shortcomings of the work and the direction of further research.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM452

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