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Polarization loss analysis and ageing characterisation of transformer oil-immersed insulation by using decoupled frequency domain spectroscopy

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High Voltage 2022年第3期7卷 575-585页

作者： xianhao fan Jiefeng Liu Yiyi Zhang Zheshi Ding Qingyin Wang Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Guangxi UniversityNanningGuangxiChina

The polarization information contained in the frequency-domain spectroscopy(FDS)could be utilised for characterising the ageing degree of transformer oil-immersed ***,the polarization information will be obscured by its conductance effect,it is thus hard to analyse the polarization behaviour by using the traditional FDS *** this issue,an alternative approach is proposed to analyse the polari-zation information using FDS decoupled by logarithmic-derivative spectroscopy(LDS).Findings proved that the polarization loss information generated by polarization behaviour can be separated from the total dispersion *** proposed feature pa-rameters are later used to analyse the polarization loss information under ageing ***,the polarization loss surface is constructed by using these feature parameters to characterise the ageing degrees of oil-immersed ***,the potential possibility of using the proposed method to analyse the polarization loss and ageing degree are respectively discussed.

关键词： immersed polarization character

Analysis of low‐frequency polarisation behaviour for oil‐paper insulation using logarithmic‐derivative spectroscopy

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High Voltage 2021年第3期6卷 460-469页

作者： Jiefeng Liu xianhao fan Yiyi Zhang Benhui Lai Jian Jiao School of Electrical Engineering Guangxi UniversityNanningGuangxiChina Electric Power Research Institute Guangxi Power Grid CorporationNanningGuangxiChina

The low‐frequency polarisation information of oil‐paper insulation could be easily obscured by the conductance effect,and the contained polarisation information thus can not be readily extracted from the frequency domain spectroscopy(FDS).Given this issue,an alternative idea is reported to extract the low‐frequency polarisation infor-mation by using logarithmic‐derivative spectroscopy(LDS).The present findings proved that the parameters extracted by using the LDS can be applied for studying the low‐frequency polarisation behaviour under the moisture *** that respect,the novelty of this work is in the exploration of the LDS as a potential tool to extract feature parameters for analyzing the low‐frequency polarisation information of trans-former oil‐paper insulation.

关键词： effect insulation behaviour

An improved second-order kinetic model for degradation analysis of transformer paper insulation under non-uniform thermal field

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High Voltage 2023年第1期8卷 81-90页

作者： Jiefeng Liu Kuo Jiang Qingyin Wang Heng Zhang Enze Zhang xianhao fan Yiyi Zhang School of Electrical Engineering Guangxi UniversityGuangxiNanningChina

The ageing kinetic model is regarded as an effective tool to describe the degradation of transformer paper ***,the temperature of the transformer winding is unevenly distributed,and the existing ageing kinetic models only depend on experimental data of accelerated thermal ageing at a constant *** this issue,this work proposes an improved second-order kinetic model accounting for the non-uniform thermal ***,oil-paper insulation samples with different ageing stages are prepared under the non-uniform thermal ***,the sample's experimental data of moisture dispersion and distribution of degree of polymerisation are *** this basis,the improved second-order kinetic model is derived to simulate insulating paper's ageing process subjected to an axial temperature ***,the relationship of the parameters in the improved second-order kinetic model with the temperature and moisture content at different winding heights is ***,the proposed model is validated,and the results show that the proposed model is more scientific than the traditional models to describe the degradation of paper *** that respect,this work illustrates an improved second-order kinetic model to provide a reference for the ageing assessment/life prediction of transformer paper insulation under the non-uniform thermal field.

关键词： kinetic thermal insulation

Microscopic mechanisms analysis of various dielectric response processes in oil-paper insulation with different insulating states

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High Voltage 2024年第3期9卷 591-600页

作者： Zaijun Jiang Jiefeng Liu xianhao fan Heng Zhang Enze Zhang Boshu Song Yiyi Zhang School of Electrical Engineering Guangxi UniversityNanningGuangxiChina

Various dielectric response processes in the oil-paper insulation are sensitively affected by the insulating states(ageing degrees and moisture contents).However,the existing research is still incomplete in revealing the microscopic mechanisms of various dielectric response processes in oil-paper insulation with different insulating *** this issue,the genetic algorithm is first adopted to extract the Dissado–Hill(D–H)model parameters by simulating the frequency domain spectroscopy(FDS)of oil-paper ***,the change laws of the extracted D–H model parameters are adopted to reveal the microscopic mechanisms of various dielectric response *** mechanisms of four dielectric response processes are studied,which are quasi-dc relax-ation,loss peak relaxation,optical frequency relaxation,and DC ***,due to the dielectric response processes being dominated by various polar particles(methanol,ethanol,furfural,and water molecule),the contents of various ageing by-products dissolved in the insulating oil are measured to support the above *** this respect,a dielectric theoretical reference for the FDS technique to research the insulating states of oil-paper insulation is provided.

关键词： mechanisms insulation relaxation

Photon count technique as a potential tool for insulation microdefect detection:Principles and primary results

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iEnergy 2023年第4期2卷 258-263页

作者： xianhao fan Hanhua Luo fangwei Liang Jun Hu Weidong Liu Chuanyang Li Jinliang He Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

The requirements for the construction of a new power system inevitably pose significant challenges and changes to the operation and maintenance of the power *** ensure the safe and stable operation of ultra-high voltage(UHV)transmission equipment,this work reports on the principles and preliminary results of using electroluminescence(EL)-based photon counting(PC)methods for early detection of micro-defects in GIS/GIL insulation *** this study,the impact of voltage,gas pressure,and gas composition on the photon response of insulation is ***,the corresponding relationship between defect status and photon response characteristics is explored,along with the discussion of the EL mechanism and its evolution induced by *** research results demonstrate that PC measurement exhibits high sensitivity to variations in millimeter-scale defect size,position,and morphology at lower electric fields before partial discharge(PD)*** this regard,this paper reveals promising prospects for the early detection of micro-defects in UHV transmission equipment using PC measurement-based methods.

关键词： Gas-insulated equipment epoxy insulation defect detection partial discharge(PD) electroluminescence(EL)

Photon counting technique as a potential tool in micro-defect detection of epoxy insulation pull rod in gas-insulated switchgears

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High Voltage 2024年第2期9卷 267-274页

作者： xianhao fan Shu Niu Hanhua Luo Jizhong Liang fang Liu Wenqiang Li Weidong Liu Wensheng Gao Yulong Huang Chuanyang Li Jinliang He School of Electrical Engineering Tsinghua UniversityBeijingChina Electric Power Research Institute Shangxi Power Grid CorporationTaiyuanShanxiChina Shandong Taikai Electrical Insulation Co. Ltd.TaianShandongChina

The micro-defects in epoxy-based insulation materials generate a local high electric field which results in continuous degradation,seriously endangering the insulation system of gas-insulated switchgears.A highly sensitive detection technique is reported for micro-defects of insulation pull rods based on the photon counting(PC)*** re-sults demonstrated that for an epoxy-based insulation pull rod,the photons released during electroluminescence and ionisation at 2 kV,which is less than the partial discharge inception voltage,can be clearly *** findings presented a strong correlation between photon counts and defect *** has been conducted to elucidate the mechanism behind defect-induced PC,employing the amplification of ionising luminescence through electric field distortion induced by micro defects and the augmentation of electroluminescence through the aggregation of trap *** this regard,the authors verified that PC can serve as a potential tool in the detection of micro-insulation defects,which also has huge potential in online insulation condition monitoring.

关键词： technique. insulation defect

融合频域介电谱及支持向量机的变压器油浸纸绝缘老化状态评估

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电工技术学报 2021年第10期36卷 2161-2168页

作者：范贤浩刘捷丰张镱议王子潇广西大学电气工程学院南宁530004

变压器油纸绝缘老化-受潮协同效应能够显著影响其频域介电谱(FDS)数据,因此,在绝缘严重受潮情况下难以利用FDS技术实现纸绝缘老化状态的准确评估。鉴于此,该文融合FDS以及支持向量机(SVM)提出了一种考虑水分-老化协同效应的变压器油浸... 详细信息

变压器油纸绝缘老化-受潮协同效应能够显著影响其频域介电谱(FDS)数据,因此,在绝缘严重受潮情况下难以利用FDS技术实现纸绝缘老化状态的准确评估。鉴于此,该文融合FDS以及支持向量机(SVM)提出了一种考虑水分-老化协同效应的变压器油浸纸绝缘老化状态评估方法。在当前的研究中,首先,制备具有不同老化及受潮状态的油浸纸绝缘样本,并基于FDS测试提取用于表征绝缘劣化状态的特征参量。其次,基于多元回归分析构建用于训练老化状态分类模型的拟合介电特征参量数据库。最后,利用拟合介电特征参量数据库和SVM构建用于老化状态评估的分类模型。研究结果证明,构建的分类模型可以准确评估不同受潮状态的变压器油浸纸绝缘样本的老化状态。

关键词：变压器油浸纸绝缘老化状态评估频域介电谱支持向量机

China’s 10-year progress in DC gas-insulated equipment:From basic research to industry perspective

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iEnergy 2022年第4期1卷 400-433页

作者： Chuanyang Li Changhong Zhang Jinzhuang Lv fangwei Liang Zuodong Liang xianhao fan Uwe Riechert Zhen Li Peng Liu Jianyi Xue Cheng Pan Geng Chen Lei Zhang Zheming Wang Wu Lu Hucheng Liang Zijun Pan Weijian Zhuang Giovanni Mazzanti Davide Fabiani Bo Liu Shaohua Cao Jianying Zhong Yuan Deng Zhenle Nan Jingen Tang Jinliang He State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Maintenance&Test Center of EHV Power Transmission Company China Southern Power Grid Guangzhou 510663China EHV Power Transmission Company China Southern Power Grid Guangzhou 510663China Hitachi Energy Switzerland Ltd ZürichSwitzerland Key Laboratory of Engineering Dielectrics and Its Application Ministry of EducationHarbin University of Science and TechnologyHarbin 150080China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’an 710049China School of Electrical Engineering and Automa-tion Hefei University of TechnologyHefei 230009China School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Department of Electrical Engineering Shanghai University of Electric PowerShanghai 200090China School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China Department of Electrical Electronic and Information EngineeringUniversity of BolognaBologna 40136Italy Shandong Taikai Electrical Insulation Co. Ltd.Tai’an 271000China PingGao Group CO. Ltd.Pingdingshan 467001China China XD Group Co. Ltd.Xi’an 710075China Jiangsu Jinxin Electric Appliance Co. Ltd.Yangzhou 225202China

The construction of the future energy structure of China under the 2050 carbon-neutral vision requires compact direct current(DC)gas-insulation equipment as important nodes and solutions to support electric power transmission and distribution of long-distance and *** paper reviews China's 10-year progress in DC gas-insulated *** progresses in basic research and industry perspective are presented,with related scientific issues and technical bottlenecks being *** progress in DC gas-insulated equipment worldwide(Europe,Japan,America)is also reported briefly.

关键词： DC gas-insulated switchgear(GIS) DC gas-insulated power transmission line(GIL) surface charge flashover metal particle offshore projects

基于扩展对数微分谱的XLPE电缆绝缘极化信息分析

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高电压技术 2022年第6期48卷 2187-2197页

作者：赵晰晰刘捷丰范贤浩赖本辉张镱议广西大学电气工程学院南宁530004

频域介电谱(FDS)法是评估交联聚乙烯(XLPE)电缆绝缘老化状态的有效手段。然而,FDS中-低频区域的极化信息会被直流电导分量所覆盖,这严重制约了FDS法评估XLPE电缆绝缘老化状态的准确性。针对这一问题,提出了一种基于扩展对数微分谱(ELS)... 详细信息

频域介电谱(FDS)法是评估交联聚乙烯(XLPE)电缆绝缘老化状态的有效手段。然而,FDS中-低频区域的极化信息会被直流电导分量所覆盖,这严重制约了FDS法评估XLPE电缆绝缘老化状态的准确性。针对这一问题,提出了一种基于扩展对数微分谱(ELS)的FDS解析方法,该方法能有效提取FDS测量数据中的极化信息分量,进而实现对XLPE电缆绝缘老化状态的准确分析。首先,通过实验获得不同老化时间/温度下所制备XLPE电缆样品的FDS曲线;其次,利用ELS获取其复极化率虚部,并提取可用于反映极化信息的特征参数;最后,建立了老化时间/温度与特征参数之间的定量关系。验证结果表明:XLPE电缆样品老化时间/温度表征的误差分别为0.39%和0.07%。提出的ELS可作为分析XLPE电缆内部极化信息的潜在工具。

关键词：交联聚乙烯电缆频域介电谱极化信息扩展对数微分谱老化评估