08_efield_composite - 302 R. Zeng et al.: Measurement of...

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R. Zeng et al.: Measurement of Electric Field Distribution Along Composite Insulators by Integrated Optical Electric Field Sensor 1070-9878/08/$25.00 © 2008 IEEE 302 Measurement of Electric Field Distribution Along Composite Insulators by Integrated Optical Electric Field Sensor Rong Zeng, Yun Zhang, Weiyuan Chen and Bo Zhang State Key Lab of Power Systems, Dept. of Electrical Engineering, Tsinghua University, Beijing 100084, China ABSTRACT In order to meet the demands for the electric field measurement along the composite insulators simultaneously, such as intensive signal, fine insulation, passive and small size, a novel measurement system based on the core device, the integrated electro-optic sensor, was developed. First, the theory of the system and the sensor were introduced. Second, after fabrication, the input/output character was obtained and the calibration was implemented between two parallel square metal planes under power frequency. By optimum design, this kind of novel sensor was suitable for insulated, intensive (> 250 kV/m), small size (55 mm x 2 mm x 1 mm) electric field measurement. Third, the axial and radial electric field distribution of the insulators were measured carefully in laboratory, and by combining the BEM and CSM method, the electric field of the same insulators was numerically calculated. Finally, the measurement and calculated results of electric field distribution were compared and the relationship between them were analyzed. This comparison verified the suitability and importance of the measurement system. Index Term - composite insulators, electric field measurement, integrated electro-optic field sensor, BEM, CSM. 1 INTRODUCTION COMPOSITE insulators have been widely used in high voltage transmission lines in China for many years [1], because of its lightness, advantage in anti-pollution, and little maintenance in operation. The uneven distribution of the electric field upon the surface of the insulators, which is caused by the structure design and the material, is one of the reasons for partial discharge, or even breakdown. So, it is very important to get to know the electric field distribution at power frequency, which will be very useful for the optimum design of the insulators, the confirmation of the parameters of the grading ring and supplying guidance for the research of online diagnosis. Measurement is the most useful and directly method to acquire the distribution of the electric field and can be sorted into direct and indirect methods. The indirect method gets the field by means of the measurement of the distribution of potential on the insulators. The most popular used instrument for voltage distribution method were metal spherical dipole [2-6] and parallel high resistance divider [7]. These kinds of methods were simple, but there were some disadvantages. The contact of the sensor with the insulator will affect the original voltage distribution because of the dispersed capacitance changed by the sensor.
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08_efield_composite - 302 R. Zeng et al.: Measurement of...

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