Photodetector array for measuring the spatial-temporal distribution characteristics of electric field in oil-pressboard insulation based on the Kerr electro-optic effect  

作　　者：Chunjia Gao Bo Qi Chengrong Li Yukung Zheng 

机构地区：[1]State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing,China

出　　处：《High Voltage》2025年第1期95-105,共11页高电压(英文)

基　　金：National Natural Science Foundation of China,Grant/Award Number:52107148;Postdoctoral Research Foundation of China,Grant/Award Number:2020M680485;Fundamental Research Funds for the Central-Universities,Grant/Award Number:2021MS004。

摘　　要：Accurate measurement and effective analysis of the space electric field and charge characteristics within the oil-pressboard insulation structure of converter transformer are essential for achieving precise insulation structure design.Presently,most electric field measurement methods relying on the Kerr electro-optical effect are limited to single-point measurements.Given the complexity of converter transformer insulation struc-tures,including their large scale and the use of various materials,existing technologies and findings struggle to provide comprehensive electric field observations within the oil-pressboard region.After leveraging the Kerr electro-optic effect,a high-precision 32-unit photodetector array has been developed to achieve regional measurements of spatial-temporal electric field in oil-pressboard insulation.The array boasts a measure-ment spatial resolution of 1.4 mm^(2)and a sensitivity of 0.15 kV/mm,ensuring mea-surement accuracy exceeding 96.50%.Through practical measurements of the spatial electric field distribution within the oil-pressboard insulation under direct current voltage,the non-uniform distribution of the electric field is effectively captured in oil.Notably,the maximum deviation in field strength at different positions within the transformer oil can reach 18.5%.Moreover,as the applied voltage increases,the un-evenness coefficient of the field strength gradually rises,peaking at 1.19,which signifies a progressive expansion in the area affected by electric field distortion.By conducting tests to assess the dispersion of volume resistivity in samples from various positions within large sheets of pressboard,the variation in volume resistivity of materials is posited as one of the contributing factors to the non-uniform distribution of electric field within the oil.The detailed accomplishments aim to provide essential technical and theoretical support for optimising insulation structure design of converter transformers.

关 键 词：INSULATION distribution field 

分 类 号：TM4[电气工程—电器]