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Design and Electromagnetic Properties Simulation of Embedded Ultra High Frequency Sensor for the Online Monitoring of Partial Discharge in Power Cable Accessories

Author: FuZuoZuo
Tutor: Wang
School: Hunan University
Course: Electrical Engineering
Keywords: UHF Partial discharge Electromagnetic waves Cable Accessories Sensor
CLC: TM835
Type: Master's thesis
Year: 2010
Downloads: 170
Quote: 0
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Abstract


With the rapid development of China's power industry, the continuous transformation of the urban grid, power cable, with its superior performance is widely used in the distribution network of the various voltage levels, especially high voltage, EHV power cables in the power grid to occupy a very important position. However, the safe and stable operation of one of the technical difficulties of such products is the high voltage cable connection technology, statistics show that at least half of the cable line fault caused due to the failure of the cable connection. Cable accessories has become the typical position of the weakest link of the high-voltage cable line insulation and operational failure. Therefore, the insulation fault-line monitoring of high voltage cable accessories have a very important theoretical and practical significance. Compared with the traditional method of detection, UHF detection method can be measured in a higher signal-to-noise ratio band, can effectively avoid the interference signal, especially in recent years, the successful application of the GIS, domestic and foreign experts began to try to expand this approach to cable accessories line partial discharge monitoring technically. In this paper, the excitation of high frequency electromagnetic waves in the the cable accessories partial discharge propagation characteristics of simulation, for UHF sensor design provides theoretical support. In this paper, a high-frequency electromagnetic simulation software Ansoft HFSS modeling and simulation analysis of the propagation characteristics of partial discharge generated by high-frequency electromagnetic waves in the cable joints of the middle joint of the 110kV cable. Simulation of the field distribution of the partial discharge excited electromagnetic waves of different frequencies in the cable joints, and simulate the characteristics of the different bands PD signal propagation in cable joints. The first time in the country to achieve the dynamic simulation of partial discharge Cable Joints of the three-dimensional space of electromagnetic wave propagation characteristics. Simulation and analysis of partial discharge propagation characteristics of electromagnetic waves, given the UHF sensor design for 110kV Cable Joints line monitoring requirements. According to the design requirements of the microstrip patch antenna and a helical antenna selection and structure parameters of the design, and use of the HFSS simulation characteristic spectra of the two antenna sensor VSWR, pattern, gain, and structural parameters The impact of the dielectric constant of the different materials on the sensor performance, and characteristics of these two sensors at the same time, meet the practical requirements in order to get a UHF sensor. Provides theoretical support for further development of the research and application of UHF the sensor cable accessories partial discharge monitoring.

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CLC: > Industrial Technology > Electrotechnical > High Voltage Engineering > High voltage test equipment and measurement techniques > High - voltage measurement technique
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