架空输电线相电压无地线检测装置的分析-analysis of earth - free detection device for phase voltage of overhead transmission line.docxVIP

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架空输电线相电压无地线检测装置的分析-analysis of earth - free detection device for phase voltage of overhead transmission line.docx

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架空输电线相电压无地线检测装置的分析-analysis of earth - free detection device for phase voltage of overhead transmission line

AbstractIn the power system, in order to ensure the safe and stable operation of the power system, it is necessary to detect the voltage, current and other parameters in real time . Along with the high speed development of the social economy of the country, the power system has also been a rapid development. The power grid ’s voltage grade rises ceaselessly. The testing equipment that supports it also has a digital and automatic development. The traditional voltage transformer cant satisfy the demand of modern power system in voltage grade and the detection mode.This paper analyzes the traditional detection methods and the advantages and disadvantages of new on-line monitoring. Then, the paper describes the detecting theory for the voltage by the use of the spatial capacitance divider in detail. Based on the analysis of the electric field around the overhead transmission line ,this paper studies the characteristics of the spatial capacitor between the spatial conductor and the ground. Based on this ,the paper designed and processed the voltage sensor. With the use of the signal processing circuit, the paper can take a process on the output signal of the voltage sensor to obtain the relation between the input and output.In the end, the following AD circuit get the output signal for a further processing and analysis using. After this, the paper take a lot of experiments with the complete set designed by the author to study the characteristics of the set on different conditions especially with a differet height. The experimental data and results prove that the device works well in the indoor environment and the input and output keeps a linear relationship.Keywords: overhead transmission line, electric field, spatial capacitance, without grounding line, voltage sensor华中科技大学硕士学位论文目录摘要............................................................................................................ IAbstract .............................................................