Test methods for determining electrical properties of electric cables and wires . measurement of volumeresistivity of semi - conducting rubbers and plastics 电线电缆电性能试验方法半导电橡塑材料体积电阻率试验
Method of testing insulating materials . methods of test for volume resistivity and surface resistivity of solid electrical insulating materials 绝缘材料的试验方法.固体电绝缘材料的体积电阻率和表面电阻率的试验方法
Also the regulations of stain and resistivity of smart composite with additives of continuous carbon fiber and graphite are analyzed 本文还对连续碳纤维、鳞片填料在拉伸状态下应变与体积电阻率之间的变化关系进行了研究和分析。
In order to explain the phenmena , two supposes of " hole " and " polar - group rupture " are proposed , according to the tests of ir , density , refractive index , conductor volume resistivity , the aging model of pmma is confirmed likely 通过其他实验（如红外光谱、测量密度、测量折射率、测量体积电阻率）的相互对比，基本上肯定了有机玻璃“极性基团断裂”的热老化模型。
On the basis of relative literatures published in recent years , the effects of nano - fillers on the corona - resistance , breakdown strength , volume resistivity and dielectric properties of polymer nanocomposites are reviewed , the future research direction is also pointed out 在综合国内外近年来公开发表的相关文献基础上，对无机纳米粒子的填充对聚合物材料在击穿强度、体积电阻率、介电性能以及耐电晕等方面的研究进展进行了评述，并指出今后研究的方向。
This paper mainly study two kinds of smart materials which are both reinforced by chopped carbon fiber mat but use two different kinds of polyester resin as matrix and discuss the influence of content of carbon fiber on conductivity . focus on the relationship between strain and volume resistivity under tensile condition influenced by the factors such as resin matrix and fiber content 研究了其含量与导电性之间的关系；重点对不同基体树脂材料及不同碳纤维含量等因素对复合材料在单轴拉伸条件下，拉伸状态下应变与体积电阻率之间的变化关系进行了研究；确定了电阻率与应变之间变化的数学关系。
On the base of the iec standard of dc suspension insulators , we designed a new ion migration test for 500kv dc ceramic support insulators , including the regulation between the bulk resistance and the temperature , the test samples , the test voltage and the temperature for long - term ion migration test , and the amount of accumulative charges 以悬式绝缘子离子迁移试验标准为基础，完整的设计了500kv直流支柱式瓷绝缘子离子迁移试验，其中包括研究了试品体积电阻随温度场强变化的规律，成功的设计了试验试品，确定了长期离子迁移试验电压( 40kv )和试验温度( 130 ) ，计算了50年累计电荷量( 0 . 173c ) 。
Using the advanced technology by its head office ( newkey co . , ltd . ) , it produces various kinds of alumina black and white ceramic products . the component alumina ceramics , which are widely used in electron components , devices , electrical products , enjoy low loss of high frequency , high insulating strength , good specific volume resistance , small dielectric constant , high mechanical intensity and excellent airtightness and thermal and chemical stability 本公司根据目前市场需求，生产出各种型号的黑、白陶瓷产品，广泛应用于电子、电工、化学工业、纺织工业、水暖、宇航、环保等诸多方面，系列产品有高频损耗少，比体积电阻大，介电常数小，强度高，气密性、热稳定性、化学稳定性好等特点。
So , this paper researches the principle of measuring system of insulating oil dielectric loss and volume resistivity . during the measuring process , the insulating oil must be heated and kept at 90 in 15 minutes . medium - frequency induction heating method is presented to instead of the electrical resistance furnace heating method on chapter 2 , and a kind of subdivision - controlled integral - separated digital pid algorithm is designed to control the medium - frequency induction heating apparatus 本文对恒温控制系统进行了研究，提出了以中频感应加热方式取代原有的电阻炉加热方式，设计了一种分段控制的积分分离式数字pid控制器来控制中频感应加热装置，并通过通信设计将恒温控制系统与介损及体积电阻率测试系统有机结合为一体机，实验结果表明该恒温控制系统完全满足介损及体积电阻率测试中的控温要求。
The measurement of dielectric loss and volume resistivity is effective preventive tests to judge insulating oil isolation status of polluted and aging , and it ' s important method of ensuring the safe operation of transformer and oil - filled circuit breaker , etc . however , the measuring systems of insulating oil dielectric loss and volume resistivity used at present exist the shortcoming of low accuracy , weak repeatability , inconvenience , and its thermostatic control system ca n ' t meet the challenge 绝缘油的介质损耗因数、体积电阻率测量，是判断绝缘油的劣化与污染程度的有效预防性试验，是保障变压器、油断路器等充油电力设备安全运行的重要手段。然而，目前所使用的绝缘油介质损耗因数、体积电阻率测试系统存在着测量精度低、测量结果重复性不好、控温系统不能满足控温要求、操作不便等缺陷，针对这一现状，本文对绝缘油介损及体积电阻率一体化测试系统进行了研究。
