Measurement of electric field distribution along composite insulators by integrated optical electric field sensor

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.Rong Zeng (M'02, SM'06) was born in Shaanxi, China in 1971. He received the B.Sc., M. Eng., and Ph.D. degrees from the Department of Electrical Engineering, Tsinghua University in Beijing, respectively in 1995Beijing, respectively in , 1997Beijing, respectively in , and 1999. He became a lecturer in the Department of Electrical Engineering, Tsinghua university in Beijing in 1999, and an associate professor in 2002. Now he is vice dean of the Electrical Engineering Department, Tsinghua University. He is currently working in the fields of lightning and grounding research, lightning protection, and electromagnetic compatibility (EMC) in power system, with main emphasis on the hybrid research of electric and magnetic field measurement by integrated optical sensor and numerical simulation of long air gap discharge process. He is the author and coauthor of more than 20 IEEE transaction papers.

Effect of moisture on temperature rise of composite insulators operating in power system

“…A length of the sample from high-voltage end metal fitting to the fifth piece of big sheds is in the test circuit, the sample suspended in the artificial climate chamber. Electric field distribution along the axis of the sample is measured, by using an electric field measurement system based on optoelectronic integrated technology [13]. When the probe is arranged 2 cm away from the solid surface, the measurements error is less than 5%, comparing with the simulation results.…”

Recent Advances in Integrated Photonic Sensors

“…Mach-Zehnder modulators have been also proposed for detection of intensive electric fields [109]. In this case, the length characterizing the two arms is 40 mm, with a distance of 60 μm, but at the same time an optical path difference is realized in order to obtain a bias of π/2 useful to reach an higher linear response.…”

Sensoring Leakage Current to Predict Pollution Levels to Improve Transmission Line Model via ANN

“…Therefore, the leakage current of the insulator strings was measured, in which a light emitting diode (LED) was used to detect current signals as photoelectric conversion and light signal stability [7]. Many numerical methods have been introduced to ease the difficulty of precise measurements of electric fields including the use of charge simulation method to calculate the electric field distribution of insulators [8]. …”