共查询到20条相似文献,搜索用时 125 毫秒
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采用ASTM方法对出口聚氯乙烯绝缘电线的绝缘电阻进行测量,并以导体电阻作为各温度点温度是否稳定的考核依据,再通过计算得出了绝缘电阻的温度校正系数。结果表明,绝缘电阻与温度的变化关系完全符合指数规律。 相似文献
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传统最优潮流(OPF)虽然将电网的经济性、安全性和电能质量进行了很好的统一,但在其数学模型中,仅考虑了电网线路的电气模型,而忽略了实际情况下线路的电热耦合关系,因此采用传统OPF计算结果作为实际电网调度运行的参考有着较大的偏差。在电热协调理论的基础上,根据线路温度和线路电阻之间的电热联系,建立了考虑电热耦合关系的温度OPF模型。此外,为进一步提高算法的计算效率,对电、热模型进行解耦计算,然后基于内点法进行求解。最后,通过对IEEE 5节点系统,MATPOWER中的Case 30、Case 2736、Case 3012节点系统以及一个实际1856节点系统进行仿真测试,验证了该模型和算法的有效性与正确性。 相似文献
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1.概述电热电容器热稳定试验是为了测得产品最热点温度,考核其在允许最高环境温度和最高工作电压下长期运行的热稳定性,并鉴别所用介质的性能和工艺的好坏。由此可见,热稳定试验在型式试验里处在重要的地位。 相似文献
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金属永磁材料的前沿问题 总被引:3,自引:1,他引:3
在回顾磁能积的发展过程与分析测定磁能积因素的基础上,扼要叙述了进一步提高磁能积的可能性与途径,在未来10 ̄20年内永磁材料仍然是活跃的材料领域,永磁材料将在下列两方面有进一步发展。(1)研究与发展新型永磁材料,其中纳米晶复合交换耦合永磁材料最为引人瞩目;(2)改进与提高现有永磁材料的性能。 相似文献
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计量校准测试实验室接地电阻测试方法研究 总被引:3,自引:0,他引:3
通过调研相关接地电阻测试方法,提出了利用室内接地接线柱和供电电源地线连接组成导电测量环路,基于该测量环路采用钳形接地电阻测试仪的接地电阻测试法。实践证明该测试方法简便可行,解决了在复杂地理环境中进行接地电阻测试的一个难题,同时基于该测试方法提出了接地电阻持续监控的保障方案。该测量方法可推广应用于所有计量校准测试实验室和机房的接地电阻测试,具有较大的应用价值。 相似文献
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A method is proposed for using the cable resistance of self-regulating cable for pipeline temperature feedback and control. A controller is described which accomplishes this control without any external temperature sensors. The use of a computer program to design heating circuits and provide setup instructions is reviewed. The workings of this program are developed in some detail, and results of a typical calculation are presented. A brief summary of the advantages of standardizing on high-temperature high-voltage cables is presented 相似文献
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Programmable Metallization Cell (PMC) Random Access Memory is based on the electrochemical growth and removal of nanoscale metallic pathways in thin films of solid electrolyte. This paper investigates the resistance change characteristics with applied voltage bias on Ag/Ge–Se and Ag/As–Se chlacogenide thin film structure and describes the electrical characteristics of PMC-RAM made from these materials following annealing at 150 °C. As a result, it was obtained that R reverse/R forward ratio which represent by reversible resistance change was about 106, which ratio value can be get a high sensing margin when PMC-RAM detect the data. PMC-RAM technology promises to be non-volatile, low current and potentially, low cost for the next generation of nonvolatile memory application such as RFID chip to replace EEPROM. 相似文献
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Yasuhiko Kako Shigetaka Watanabe Yutaka Higashimura 《Electrical Engineering in Japan》1992,112(5):17-25
A new test method for internal PD resistance of insulating materials has been studied intensively by a task force at CIGRE for over ten years. Recently, Method II, which was developed by the authors, is now being studied as the international round robin test proposed by a domestic task force. This paper describes the new test method concretely and shows some typical test results. The test electrode system is characterized by adhesion of test specimen to the embedded sphere electrode, and it may be applicable to all sorts of insulating material for the internal PD resistance test under uniform partial discharges. The most important point of this method is to realize the complete adhesion by skillful techniques. It was ascertained that the spread of test data may depend only on the uniformity of materials by this method, and excellent life data can be obtained for some specific materials. 相似文献