基于局部放电的电力变压器油纸绝缘状态评估关键问题分析

发布时间：2018-06-15 06:41

本文选题：电力变压器 + 油纸绝缘　；参考：《高电压技术》2017年08期

【摘要】：目前局部放电(PD)已作为绝缘状态质量监控的重要指标,但基于局部放电的变压器油纸绝缘状态评估并无广泛工程应用。为此,总结基于局部放电的变压器油纸绝缘状态评估的研究成果,并提出需要深入研究的方向与未来发展趋势,以为后续研究提供基础。通过讨论分析油纸绝缘局部放电特性、油纸绝缘局部放电模式识别、油纸绝缘老化评估及油纸绝缘缺陷发展程度诊断4个问题,得出:不同电场类型下,油纸绝缘局部放电的起始放电特性和波形特性差异较大;在局部放电模式识别中,时间序列谱图与相位分辨局部放电(PRPD)谱图相结合的识别率最高,可达95%;图谱多元特征量的提取、降维、分类以及识别是老化评估的必要步骤;局部放电程度可分为起始、发展、严重、危害4个阶段。研究表明针对不同问题的特征量灵敏度分类以及缺陷诊断与老化评估的综合分析是需要深入研究的方向。此外,多维信息融合评估是未来变压器油纸绝缘在线评估的发展趋势。
[Abstract]:Partial discharge (PD) has been used as an important index of insulation quality monitoring, but PD based on PD is not widely used in transformer oil paper insulation evaluation. Therefore, this paper summarizes the research results of transformer oil-paper insulation evaluation based on partial discharge, and puts forward the direction of further research and the future development trend, which provides the basis for further research. Through discussing and analyzing the characteristics of partial discharge of oil-paper insulation, recognizing the mode of partial discharge of oil-paper insulation, evaluating the aging of oil-paper insulation and diagnosing the development degree of oil-paper insulation defect, it is concluded that under different electric field types, In partial discharge pattern recognition, the combination of time series spectrum and phase resolved partial discharge (PRPD) spectrum has the highest recognition rate, the difference of initial discharge characteristics and waveform characteristics of partial discharge in oil-paper insulation is great, and the combination of time series spectrum and phase resolved partial discharge (PRPD) spectrum is the highest in partial discharge pattern recognition. The extraction, dimensionality reduction, classification and recognition of the multivariate characteristic quantity of the atlas are the necessary steps of the aging evaluation. The partial discharge degree can be divided into four stages: initial stage, development stage, serious stage and harm stage. The research shows that the sensitivity classification of characteristic quantity and the comprehensive analysis of defect diagnosis and aging assessment are the directions that need to be studied deeply. In addition, multi-dimensional information fusion evaluation is the development trend of transformer oil-paper insulation online evaluation in the future.
【作者单位】：山东大学电气工程学院山东省特高压输变电技术与装备重点实验室;特高压工程技术(昆明广州)国家工程实验室;国网山东省莱芜供电公司;
【基金】：特高压工程技术(昆明,广州)国家工程实验室开放基金(NEL201513) 山东省科技发展计划(2014GGX104006)~~
【分类号】：TM855

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