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1西安科技大学毕业设计（论文）任务书站名姓名专业电气工程及自动化年级设计（或论文）题目：煤矿6kV电缆对地绝缘参数检测技术的研究完成日期：具体要求：（1）统计电力电缆绝缘故障的类型及原因；（2）明确故障发生发展的机理，并进一步了解电力电缆绝缘检测技术的各种方法，选择一种方法对其进行深入研究。（3）通过对倍压电路的研究，制作高压直流发生器（4）电力电缆的分类，电缆绝缘故障的原因及特性分析，绝缘诊断技术的研究对采用附加直流电源绝缘检测法的直流电源进行细致研究（5）通过采用EWB仿真软件，对直流高压发生器的参数选择进行仿真，选出参数。（6）根据所选参数，制作实物，进行实验验证。指导老师：职称：年月日继续教育学院盖章2西安科技大学继续教育学院毕业设计(论文)评审意见书评审意见：评审人：职称：年月日评审成绩：毕业设计评审小组签字3西安科技大学毕业设计（论文）说明书题目煤矿6kv电缆对地绝缘参数检测技术的研究函授站专业及班级电气工程及自动化姓名指导教师日期继续教育学院4论文题目：煤矿6kV电缆对地绝缘参数检测技术的研究专业：电气工程及其自动化本科生：（签名）：指导教师：（签名）：摘要随着电力事业的迅速发展，对供电可靠性和用电安全性的要求在进一步的提高，电力设备绝缘状况检测技术的发展日益得到重视，新的检测设备和检测技术在不断的推出。电线电缆是最常用的电力设备，同时也是出现绝缘故障的概率最高的设备。由于煤层大多身处地下几百米，阴冷潮湿的环境对电缆的考验更加严峻，因此为防止发生事故，对电缆的绝缘检测更加重要。论文首先简要介绍了电线电缆绝缘材料的特性，阐述了绝缘材料老化的机理、绝缘漏电流的成因和相关电路模型，并在此基础上分析了针对电线电缆的各种绝缘检测技术的原理以及各自的优缺点。其次,针对设计，重点研究了倍压整流电路的特性。使用仿真软件EWB进行线路仿真，选择电路参数，最后制作实物并进行验证实验。关键字：绝缘参数,仿真,附加直流电源,倍压整流电路5Subject:TheCoalmine6kVElectricCableToGroundTheResearchesWhichInsulateAParameterExaminationATechniqueSpecialty:ElectricalEngineeringAndAutomationName:(Signature):Instructor:(Signature):ABSTRACTWiththedevelopmentofelectricalengineeringandthefurtherdemandontheservicereliabilityandsafetyofpowersystems,theinsulationmonitoringtechniquehasbeenpaidmuchattention,atthesametime，advancedmethodsanddeviceshasbeeninconstantlyemerge.Theelectricwireelectriccableisthemostincommonuseelectricpowerequipments,alsoistoappeartoinsulatetobreakdownallaratethetallestequipmentsinthemeantime.Becausecoalbedmostlytheplacesundergroundbeseveral100meters,coldandhumidenvironmentonthecableevenmoreseveretest,soastopreventtheincident,thecableinsulationtestingevenmoreimportant.Thefirstpartofthethesishasareview-likecharacter.Itmakesabriefintroductionofthecharacteristicofdielectric,andthanthemechanismsofinsulationageingandthecircuitmodelareintroduced.Somemethodsforinsulationmonitoringarealsoanalyzedbasedonthecircuitmodel.Second,focusonthedesignforthetimesthepressureofthecircuit.TheuseofsimulationsoftwareEWBforlinesimulation,selectcircuitparameters,thefinalproductionofphysicalandverificationexperiment.KEYWORDS:insulationparameters,simulation,additionalDCpowersupply,voltage-doublingcircuit6目录摘要.....................................................错误!未定义书签。ABSTRACT..................................................................5目录......................................................................6第1章绪论...............................................................91.1电力电缆绝缘诊断意义..............................................91.2课题研究背景及意义................................................91.3论文主要工作及研究内容...........................................101.3.1论文的主要内容..............................................10第2章电力电缆的特性....................................................102.1电力电缆的使用概述及分类.........................................102.1.1电力电缆的使用概述..........................................102.1.2电力电缆的分类..............................................112.1.2.1油浸纸绝缘统包电缆[6]...................................112.1.2.2分相铅包电缆..........................................122.1.2.3自容式充油电缆........................................122.1.2.4橡皮电缆..............................................122.1.2.5聚氯乙烯电缆..........................................132.1.2.6交联聚乙烯电缆........................................132.2电力电缆故障分类..................................................132.2.1电力电缆故障产生的原因及分类................................132.2.2电力电缆故障原因............................................132.2.3故障的性质与分类............................................142.3绝缘老化的原因及类型.............................................152.3.1热老化......................................................152.3.2机械老化....................................................162.3.3电老化......................................................162.3.4其它类型....................................................172.4绝缘介质在电场作用下的特性.......................................172.4.1极化........................................................172.4.2电导........................................................1772.4.3损耗........................................................182.5绝缘介质的吸收现象...............................................19第3章电缆绝缘诊断技术..................................................233.1概况.............................................................233.2电缆绝缘停止运行诊断法...........................................243.2.1绝缘电阻的测量..............................................243.2.2泄露电流的测量.............................................253.2.3介质损耗角正切值的测量......................................263.2.4逆吸收电流法................................................273.2.5残余电荷法..................................................273.2.6电位衰减法..................................................273.3电缆绝缘在线诊断法...............................................283.3.1直流分量法..................................................283.3.2局部放电法..................................................293.3.3差频法......................................................293.3.4交流叠加法..................................................303.3.5谐波分量法..................................................30第4章附加直流电源绝缘检测法.