Effect of Temperature and Electric Field Strength on Carrier Mobility of Oil-Impregnated Pressboard Under DC Voltage

Jun Deng, Zhicheng Xie, Hao Ge, Xiaoqiang Xue, Chunjia Gao (), Jianwei Cheng, Haibin Zhou, Zhicheng Pan, Gang Lyu and Heng Wu
Additional contact information
Jun Deng: China Southern Power Grid EHV Power Transmission Company, Guangzhou 510405, China
Zhicheng Xie: China Southern Power Grid EHV Power Transmission Company, Guangzhou 510405, China
Hao Ge: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
Xiaoqiang Xue: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
Chunjia Gao: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
Jianwei Cheng: Electric Power Research Institute of CSG, Guangzhou 510405, China
Haibin Zhou: China Southern Power Grid EHV Power Transmission Company, Guangzhou 510405, China
Zhicheng Pan: China Southern Power Grid EHV Power Transmission Company, Guangzhou 510405, China
Gang Lyu: China Southern Power Grid EHV Power Transmission Company, Guangzhou 510405, China
Heng Wu: China Southern Power Grid EHV Power Transmission Company, Guangzhou 510405, China

Energies, 2024, vol. 17, issue 21, 1-17

Abstract: The influence of carrier mobility on the space charge transport behavior inside the oil-impregnated pressboard insulation of converter transformers cannot be neglected. However, at present, current knowledge is usually derived from empirical or theoretical values, lacks experimental studies, and often ignores the effects of temperature and field strength under actual operating conditions. In this paper, based on the variable-temperature surface potential decay (SPD) method, a carrier mobility measurement platform for oil-impregnated pressboard is established, and the carrier mobility values for different combinations of oil and oil-impregnated pressboard are obtained experimentally to analyze and reveal the influence mechanisms of temperature and field strength on the carrier mobility. The results indicate the following: (1) The positive and negative carrier mobilities of oil-impregnated pressboard are in the range of 10 −12 –10 −13 m 2 ·V −1 ·s −1 , and the negative carrier mobility is always higher than the positive carrier mobility. (2) The carrier mobility is positively correlated with the changes of temperature and field strength, and when the temperature increases from 20 °C to 80 °C, the positive and negative carrier mobilities increase by 4.01 times and 4.72 times, respectively; when the field strength increases from 1 kV/mm to 7 kV/mm, the positive and negative carrier mobility increases by 2.53 and 2.72 times, respectively. (3) The carrier mobility of the pressboard with a higher oil absorption rate changes more significantly with temperature; when the field strength is 7 kV/mm and the temperature increases from 20 °C to 80 °C, the positive polarity carrier mobility increases from 3.96 × 10 −13 m 2 ·V −1 ·s −1 to 2.64 × 10 −11 m 2 ·V −1 ·s −1 , an increase of 66.67 times, while the increase in the carrier mobility of the pressboard with a lower oil absorption rate is only 1.59 times. (4) The carrier mobility of the naphthenic transformer oil-impregnated pressboard is higher than that of the paraffin-based transformer oil-impregnated pressboard, and the carrier mobility of two kinds of naphthenic transformer oil-impregnated pressboard is 3.16 times and 2.47 times higher than that of the paraffin-based transformer oil-impregnated pressboard, respectively, under the conditions of 60 °C and 7 kV/mm. (5) Utilizing the Darcy model and microscopic scanning results of the pressboard morphology, it was revealed that permeability and fiber structure are key factors influencing the variation in carrier mobility. The research results of this paper can provide theoretical basis for the calibration and optimization of the oil-pressboard insulation structure of converter transformers.

Keywords: oil-pressboard insulation; carrier mobility; surface potential decay method; temperature effect; space electric field (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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