高电压技术2025，Vol.51Issue(6)：2631-2640,10.DOI:10.13336/j.1003-6520.hve.20240681
高频陡脉冲电压对环氧树脂局部放电的影响及电老化寿命研究
Effect of High Frequency Steep Pulsed Voltage on Partial Discharges and Electrical Aging Lifetime of Epoxy Resin
摘要
Abstract
Partial discharges(PDs)of solid insulation and lifetime under high-frequency electric stress with steep pulse pose challenges for the design and reliability of high-power density and high-frequency transformers.In this paper,the insulation surface discharge model was taken as an example,and the ultra-high frequency PD measurement method was used to study the influence of frequency and steep pulse parameter(du/dt)of high-frequency square wave on the surface PDs and lifetime of epoxy resin.A lifetime model for epoxy resin insulation under high-frequency square voltage cou-pling with frequency and du/dt was also established.The denoised PDs signal was obtained through the utilization of a high-pass filter,in conjunction with complete ensemble empirical mode decomposition with adaptive noise(CEEMDAN)and wavelet denoising techniques.The research results indicate that the amplitude of PDs gradually decreases with the in-crease in square wave voltage frequency and du/dt increase(1～20 kHz).In addition,the lower the frequency is,the greater the difference in PDs amplitude of epoxy resin under different du/dt will be.It is related to the rate of charge decay,where PDs become more concentrated and the discharge amplitude is smaller under high du/dt condition.The lifetime of epoxy resin insulation significantly decreases with an increase in square wave voltage frequency,and it also decreases with an increase in du/dt.Moreover,the lifetime model with frequency and du/dt coupling is established using orthogonal experiments and coupling factor analysis.A comparison between the model results and experimental data reveals an error of less than 3％,confirming the accuracy of the proposed lifetime model.This investigation presents significant implica-tion in the insulation design and application of high-power high-frequency transformers.关键词
高频方波/局部放电/电老化/寿命/小波降噪/环氧树脂Key words
high frequency square wave/partial discharge/electrical aging/lifetime/wavelet denoising/epoxy resin引用本文复制引用
王威望,吕佳鞠,关子凌,徐永生,傅明利,罗兵,李盛涛..高频陡脉冲电压对环氧树脂局部放电的影响及电老化寿命研究[J].高电压技术,2025,51(6):2631-2640,10.基金项目
国家自然科学基金(52177025) （52177025）
南方电网科学研究院有限责任公司项目(1500002022030103GY00069 （）
1500002023030103GY00309).Project supported by National Natural Science Foudation of China(52177025),Science and Technology Project of CSG Electric Power Research Institute(1500002022030103GY00069,1500002023030103GY00309). （52177025）
