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Defect recognition of oil-pressboard insulation based on frequent arc reignition phenomenon under switching impulse voltage

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High Voltage 2024年第4期9卷 773-785页

作者： Simeng Li Yukun Zhang Yunfei jia shengchang ji Yanhua Han Wensen Wang State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi'an Jiaotong UniversityXi'anChina State Grid Shaanxi Electric Power Research Institute Xi'anChina

In the past three years,a number of oil-immersed ultra-high-voltage shunt reactors have experienced discharge defects when being put into operation,resulting in an overload of ***,detecting and identifying these discharge defects caused by switching impulse voltage is challenging under steady-state *** poses unpredictable and difficult-to-assess safety risks for the longterm operation of the equipment and subsequent transient ***,comprehending the discharge behavior of oilpressboard(PB)insulation under switching impulse voltage and devising a method to identify defects becomes *** study focuses on investigating the frequent arc reignition(FAR)pattern exhibited by typical defects under both standard and oscillation switching impulse *** objective is to uncover the mechanism behind FAR and propose a defect recognition strategy suitable for transient *** study reveals the FAR process will occur at least once during the breakdown process;the FAR phenomenon is the weakest in the surface defect with a weak vertical electric *** average recovery voltage percentage and the average discharge interval of the FAR process decrease with increasing impulse amplitude or oscillation ***,the average number of discharges decreases with higher oscillation frequency,while it initially increases and then decreases with increaseing *** on the analysis of the number of FAR processes and their variation in terms of amplitude or discharge interval,a method for recognizing oil-PB defects during switching transient processes is developed and successfully applied to a case study involving acetylene overload in a 1000 kV shunt reactor.

关键词： field insulation oscillation

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Application of Excitation Function to the Prediction of RI Level Caused by Corona Discharge

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Plasma Science and Technology 2012年第12期14卷 1091-1096页

作者： ZHU Lingyu ji shengchang HUI Sisi GUO Jun LI Yansong FU Chenzhao The State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China Shanxi Electric Power Corporation Taiyuan 030001 China Electric Power Research Institute SMEPC Shanghai 200437 China

Radio interference （RI）, as an aftereffect of corona discharge, is an important research topic in the field of electromagnetic compatibility, where excitation function is applied broadly to the prediction of RI level. This paper presents the theory of excitation function method used in the RI level prediction. Then, some practical problems related to this method are discussed. The propagation procedure of corona current is solved by the phase-modal transformation, and the impedance matrix of multi transmission lines is calculated by a double logarithmic approximate model of Carson＇s Ground-Return impedance. At the same time, in order to calculate the RI level when total line corona is assumed, an analytical formula is deduced for integral operation. Based on the above solutions, an algorithm is presented and applied to the prediction of RI level of a practical overhead transmission line. Comparison of prediction and measurement results indicates that the algorithm proposed in this paper is effective and feasible.

关键词： radio interference excitation function modal propagation Ground-Return impedance

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Research on Hot-line Cleaning of Artificial Contaminanted Insulator Using High Pressure Hot Water Vapor

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高压电器 2014年第4期50卷 7-11页

作者： LE Zhenchun ZHAO Wenbin YANG Guoqing FU Chenzhao ji shengchang East China Grid Company Limited Shanghai 200002 China Shanghai Electric Power Research Institute Shanghai200437 China School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 China)

The hot-line cleaning of insulator contaminants has a great significance to prevent pollution *** technique of hot-line cleaning insulator contaminants by water vapor is proposed in this *** flashover characteristics of insulator under the procedure of cleaning by hot-line water vapor are tested to investigate the security of cleaning system in the *** kinds of insulator are chosed to carry on the *** average flashover voltage,flashover voltage gradient and withstand voltage in35 kV insulators in hot-line cleaning are *** results show that the average flashover voltage and withstand voltage of insulators used for hot-line water vapor cleaning are both larger than the operation phase voltage in 35 kV *** flashover voltage gradient is larger than usual pollution flashover voltage *** system security can be ensured when there is no overvoltage in the system,which verifies that the insulators cleaning method presented in this paper is effective and reliable.

关键词： insulator hot-line cleaning contaminant flashover voltage

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Study on the Detection Methods of DC Series Arc Fault

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高电压技术 2013年第9期39卷 2131-2137页

作者： ji shengchang LIU Yuan ZHU Yeye ZHU Lingyu State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 China

It is difficult to detect and extinguish direct current(DC)arc in power electronics systems,and the arc could easily lead to a fire and cause great damage to surrounding equipment.A DC arc generation simulation unit is established,in which DC series arcs are generated by dragging the moving electrode away from the fixed one with the help of the stepper *** addition,a ferrite rod antenna is used to receive the electromagnetic radiation signals induced by the *** on experiments using the unit,the general characteristics of DC arc,including the pulse characteristics of arc current and source output in corresponding time window,and the frequency-domain characteristics of arc current,are *** discussion on three detection methods,it is concluded that the variation of current and voltage of arc,the spectrum of the arc current during the discontinuous intervals and the radiating electromagnetic signal are all features that can be adopted for detecting DC series ***,a synthetic judgment method is suggested for further study.

关键词：故障检测方法直流电弧 DC 电磁辐射信号电力电子系统电弧电流模拟单元脉冲特性

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带电水蒸气冲洗污秽绝缘子时的交流闪络特性研究

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西安交通大学学报 2009年第12期43卷 96-100页

作者：张晋汲胜昌西安交通大学电力设备电气绝缘国家重点实验室西安710049

针对带电水蒸气清洗绝缘子污秽进行了试验研究,绘制了3种不同绝缘子随盐密变化的平均闪络电压、闪络电压梯度曲线和不同清洗方式下的闪络电压曲面,并进行了带电水蒸气冲洗污秽绝缘子时闪络电压的拟合计算和影响因素分析.结果表明:在相... 详细信息

针对带电水蒸气清洗绝缘子污秽进行了试验研究,绘制了3种不同绝缘子随盐密变化的平均闪络电压、闪络电压梯度曲线和不同清洗方式下的闪络电压曲面,并进行了带电水蒸气冲洗污秽绝缘子时闪络电压的拟合计算和影响因素分析.结果表明:在相同盐密下,FXBW4-35型绝缘子时的闪络电压和闪络梯度最高,XP-70型绝缘子次之,FC-70型绝缘子最低;幂函数可拟合带电水蒸气清洗污秽绝缘子时的闪络电压,但非最优拟合函数;采用自下而上清洗方式闪络电压最高;绝缘子污秽盐密低于4×10-4g/cm2无过电压出现情况下,带电水蒸气清洗可保证系统安全.

关键词：绝缘子污秽带电水蒸气清洗闪络电压闪络电压梯度

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计及金属塔和母线效应的悬挂式避雷器电场计算及结构优化

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电工技术学报 2005年第6期20卷 30-34页

作者：王世山汲胜昌南京航空航天大学自动化学院南京210016 西安交通大学电气工程学院西安710049

建立了悬挂于金属塔上计及高压母线效应时的金属氧化物避雷器三维静电场模型,利用有限元数值方法计算了这一静电场分布。定义了避雷器阀片电压偏差,提出了以阀片电压偏差最小化为目标的避雷器设计方法。研究了均压环的不同组合、均压环... 详细信息

建立了悬挂于金属塔上计及高压母线效应时的金属氧化物避雷器三维静电场模型,利用有限元数值方法计算了这一静电场分布。定义了避雷器阀片电压偏差,提出了以阀片电压偏差最小化为目标的避雷器设计方法。研究了均压环的不同组合、均压环小环径和阀片的介电常数对阀片电压最大偏差的影响。利用最小二乘法和分离变量法拟合了目标函数与均压环直径、悬挂高度的关系,为避雷器的结构优化奠定了理论基础,也为其他电力设备的优化提供了一条途径。

关键词：避雷器静电场有限元电压偏差

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Investigations on Discharge and Decomposition Characteristics of SF6 Under Various Experimental Conditions

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高电压技术 2013年第8期39卷 1952-1959页

作者： WANG Yuanyuan ji shengchang LI jinyu LIU Hao WANG Wei LU Xu State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China Shenzhen Power Supply Bureau China Southern Power Grid Co. Ltd. Shenzhen 518000 China

Detection of gas decomposition products is widely used for condition diagnosis of SF6-insulated equipment because of its an- ti-electromagnetic-interference ability and high sensitivity. Previous investigations show that the volume of gas chamber influences the types and concentrations of SF6 decomposition products. Therefore using a newly developed dual gas chromatography (GC) detection sys- tem we investigated the discharge and decomposition of SF6 in a discharge chamber with its volume close to that of the real chambers in GIS. Tests in the chamber were performed with different applied voltage, different electrode arrangements, and different defect types. For discharge between needle-to-plane electrodes, the typical gas decomposition products are SO2F2, SO2 and S2OF10. A near linear growth with the increase of voltage duration is found in the concentration of SO2F2, whereas the growth rates of SO2 and S2OF10 concentration decrease with time. Concentrations of SO2F2, SO2 and S2OF10 at the same voltage duration decrease with the decrease of the voltage amplitude and the increase of the needle-to-plane distance. Change of the gas chamber volume affects the generation rates of SO2F2 and SO2, however not S2OF10. For insulator surface defects, the typical gas decomposition products are CF4, CS2 and SO2. Among which, the concentrations of CF4 and SO2 increase with the voltage duration almost linearly. Moreover, a new parameter that represents the degree of SF6 degradation, the SF6 deterioration ratio, is proposed. In the needle-to-plane case, SF6 deterioration ratio is positively correlated to the fitting value of an averaged discharge capacity. However, the maximum value of SF6 deterioration ratio varies with the defect type.

关键词： SF6气体分解特性放电室实验条件气体绝缘设备分解产物平面电极持续时间

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OPTICAL AND ELECTRIC DIAGNOSTICS OF DBD PLASMA JET IN ATMOSPHERIC PRESSURE ARGON

OPTICAL AND ELECTRIC DIAGNOSTICS OF DBD PLASMA JET IN ATMOSP...

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The ⅪⅩ International Conference on Gas Discharges and Their Applications

作者： Zhiyuan Hao shengchang ji State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University

ISBN: (纸本)9771003651221

＜正＞A cold argon atmospheric pressure plasma jet generated using a device based on DBD configuration equipped with one powered ring electrodes as well as a grounded ring electrode driven by a sinusoidal excitation voltage at 10 kHz is presented in this *** of the jet are studied by electrical diagnostics,including applied voltage,conducting current,transported charge and average discharge *** addition, the light emission images are captured by digital *** results indicate that conducting current,average discharge power and transported charges increase with the applied voltage and the argon gas flow *** images of plasma jet show that the length and shape of the plasma jet can be changed by varying the gas flow rate and applied voltage amplitude.

关键词： Atmospheric pressure plasma jet DBD Argon flow rate Discharge power

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锂离子电池健康状态估计及寿命预测研究进展综述

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高电压技术 2024年第3期50卷 1182-1195页

作者：熊庆邸振国汲胜昌西安交通大学电工材料电气绝缘全国重点实验室西安710049

随着锂离子电池的应用越来越广泛,锂电池健康状态的精确估计和剩余寿命的实时预测对于锂电池系统的安全运行和降低运维成本具有重要意义。锂电池内部复杂的物理化学反应和外部复杂工作条件,使得实现精准的健康状态估计和寿命预测具有挑... 详细信息

随着锂离子电池的应用越来越广泛,锂电池健康状态的精确估计和剩余寿命的实时预测对于锂电池系统的安全运行和降低运维成本具有重要意义。锂电池内部复杂的物理化学反应和外部复杂工作条件,使得实现精准的健康状态估计和寿命预测具有挑战性。该文综述近年来锂电池健康状态估计和剩余使用寿命预测方法的研究现状,分析基于物理/数学模型、数据驱动、模型法和数据驱动融合,以及多种数据驱动融合的锂电池健康状态估计方法的优缺点及适用条件,并对比分析不同数据驱动类型的锂电池寿命预测方法。指出锂电池健康状态估计及寿命预测尚存在的问题,并对未来研究方向进行展望,对完善锂电池健康状态估计和寿命预测算法理论体系、指导实际应用技术具有重要意义。

关键词：锂离子电池状态估计寿命预测电化学模型数据驱动技术

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氩等离子体射流对聚四氟乙烯表面改性的研究

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西安交通大学学报 2014年第4期48卷 59-67页

作者：郝致远汲胜昌宋莹西安交通大学电力设备电气绝缘国家重点实验室西安710049

采用氩等离子体射流对有机材料聚四氟乙烯(PTFE)进行表面改性,通过接触角测量、扫描电子显微镜(SEM)观察、X射线光电子能谱(XPS)和衰减全反射红外光谱(ATR-FTIR)分析,以及表面电阻率和沿面闪络电压等参量的测量,研究了等离子体射流处理... 详细信息

采用氩等离子体射流对有机材料聚四氟乙烯(PTFE)进行表面改性,通过接触角测量、扫描电子显微镜(SEM)观察、X射线光电子能谱(XPS)和衰减全反射红外光谱(ATR-FTIR)分析,以及表面电阻率和沿面闪络电压等参量的测量,研究了等离子体射流处理前后PTFE的表面特性。实验结果表明:氩等离子体射流产生的粒子主要有OH、N*、Ar和少量的O。PTFE经大气压氩等离子体射流处理后,其表面水接触角下降,表面粗糙度变大,表面突起和裂痕显著增加,且表面有新的含氧基团生成;增加表面改性时间,表面改性效果会达到饱和状态;另一方面,表面改性后的PTFE存在微弱的老化效应,当在空气中放置10d后,其表面水接触角为66.2°,仍然低于表面处理前的值。由于等离子体改性使PTFE表面形态及化学成分发生变化,粗糙度增加,使PTFE表面电阻率降低,导致其沿面闪络电压升高。

关键词：等离子体射流表面改性聚四氟乙烯水接触角闪络电压

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