110 kV阻燃聚乙烯高压电缆阻燃性能研究

对不同阻燃体系的聚乙烯外护套、沥青涂覆量、电缆规格以及阻燃半导电层的110 kV高压电缆阻燃性能进行了研究.通过成束燃烧试验碳化高度的试验数据对比分析,结果表明阻燃聚乙烯护套高压电缆的阻燃性能与外护套材料阻燃体系、沥青涂覆量、电缆规格、半导电层阻燃性能密切相关.     

材料氧指数与电缆成束燃烧关系的分析

通过对阻燃电缆原材料氧指数和电缆成束燃烧试验数据的对比,分析出阻燃料氧指数与成品阻燃性能级别之间的关系,在阻燃材料选用以及产品定性方面对企业生产有参考意义。     

基于防火毯的非阻燃电缆分段阻隔技术研究

阻燃性能是影响电力电缆安全运行的重要因素之一.基于非阻燃电缆的应用现状,提出了分段阻隔技术思路,通过燃烧模拟试验平台对比分析玻璃纤维和复合陶瓷防火毯的耐火性能差异,验证了将防火毯用于电缆阻燃性能提升的有效性.利用FDS建立了电缆隧道仿真模型,分析了不同风速下的温度分布规律,结果表明,在1 MW的火源功率下,非阻燃电缆的分段阻隔间距不应大于10 m.分段阻隔技术对在运非阻燃电缆的永久性防火治理具有一定借鉴意义.     

新型电缆的低烟无卤阻燃环保特性

发生火灾时,工程中使用的优质阻燃电缆可以减少火灾中人员的伤亡和经济的损失,因此设计师和业主都非常关注电缆的低烟无卤阻燃性能。介绍了电缆的种类,对新型铝合金铠装电缆的低烟无卤阻燃性能作了详细的阐述。经检测,该新型电缆已通过测试,值得推广。     

辐照交联聚烯烃低烟无卤阻燃电缆的开发

研制开发的辐照交联聚烯烃低烟无卤阻燃电缆，除具有优良的阻燃性能以外，在火灾情况下产生的烟雾又有毒气体极少，能保持令人满意的特殊安全性能。介绍了这种电缆的结构与材料选择，电缆特性及相应试验方法。     

低烟无卤阻燃电缆的现状与展望

在简要回顾国内外电缆阻燃技术发展情况的基础上，叙述了低烟无卤阻燃电缆的结构及其特征；电缆低烟无卤阻燃的主要途径，包括无卤阻燃剂的阻燃机理、阻燃剂的性能及其选择使用、水合金属氧化物粒度对阻燃效果的影响、低烟无卤阻燃电缆的制造工艺；低烟无卤阻燃电缆的评价方法，包括阻燃性、发烟性；并从扩大低烟无卤阻燃电缆使用范围出发，展望了其发展应在降低成本、开发高效无权阻燃剂和标准化、系列化方面作出努力。     

低烟无卤高阻燃综合护套铁路信号电缆的研制

地铁用综合护套信号电缆一般要求阻燃等级为B类,现在个别大型城市如北京要求阻燃等级为A类。通过改变原来B类电缆结构,在缆芯外绕包陶瓷化硅橡胶复合带,将阻燃内护套改成隔氧套,可以使综合护套信号电缆达到阻燃A类要求。     

锂离子电池用阻燃电解质研究进展

综述了锂离子电池用阻燃电解质研究现状,对常用电解质的燃烧、爆炸机理和阻燃机理进行了讨论.阻燃添加剂主要分为两大类:一类是含氟的醚类和酯类,另一类是有机磷系.对阻燃性能的测试方法作了简单介绍,并对阻燃添加剂发展前景进行了展望.     

低烟无毒阻燃电缆(净化电缆)的开发

通过对电缆的阻燃性、发烟性、腐蚀性和毒性等试验,分析了净化电缆与通常的阻燃电缆的区别。扼要地叙述了电缆的净化手段和几种净化电缆的结构和特点。     

阻燃防鼠型90℃PVC电缆护套料配方研究

本文分析了电缆用阻燃防鼠型90℃ PVC护套料防鼠性能及阻燃性能分别与防鼠剂用量及阻燃剂用量的关系．阻燃防鼠PVC护套料物理机械性能及电气性能与树脂、增塑剂、稳定剂、抗氧剂、填充剂等添加剂之间的关系．介绍了阻燃防鼠90℃ PVC护套料配方的研制过程及配方性能。     

汽车用耐高温125°C电缆料的开发

由于汽车技术的快速进步,特别是发动机室内温度的提高,汽车制造商要求应用更耐热、耐磨和耐化学物质的材料。交联聚烯烃成为能够满足这些要求的产品的关键技术。最近美国Dow化学公司已经致力于过氧化物和潮气交联技术方面的研究与开发,用来制造能够用于125°C的汽车电缆。本文介绍该公司开发的一种具有优良的耐热性和可加工性的过氧化物交联的汽车电缆材料。还讨论了该公司与一家国际汽车电缆制造商联合开发的用潮气交联的汽车电缆材料。文章说明了聚合物、阻燃剂与交联度对产品性能的影响。     

Fire-Retardant Cable Systems

The increasing use of nonmetallic cables in cable trays for industrial plant applications as recognized in the 1975 National Electrical Code, Article 340, mandates that these cables be suitable for this application and that the outer sheath be flame-retardant. The significance of various flame tests is discussed, and data obtained following procedures and modifications of IEEE Standard 383-1974, Section 2.5, are presented. It is evident that nonmetallic sheathed tray cables are available that will comply. Furthermore, when a flame-resistant jacket is applied over type ALS, MC, or AC armored assemblies, it results in an exceptionally rugged, corrosion, and flame-resistant nonpropagating construction.     

Evaluation of Locomotive Cable Insulation Life Under Varying Temperature Loading

A method is described for evaluating the life of cable insulation subjected to the varying temperature and time electrical service conditions of a locomotive. This type of evaluation becomes more important as the current ratings of higher fuel efficiency locomotives are increased, subjecting cable insulation materials to higher operating temperatures. Insulations evaluated by this proposed technique are first tested at several elevated constant temperatures to determine their thermal aging characteristics. Based on the material performance data, the insulation life consumed by the thermal stresses imposed by the locomotive duty cycle is calculated. This method can be readily applied to measure the effects of temperature cycles on cable life, objectively compare the performance of different insulations, and assess the design margin of locomotive cables. It may also be used to establish Association of American Railroads (AAR) specification requirements for thermal aging tests based on the conditions of actual field application. A method for evaluating cable life through testing and duty cycle analysis has been developed and verified by examination of cables in service. A new high performance insulation developed by the General Electric Wire and Cable Business Department is shown to offer reliable service life under the varied and demanding operating conditions of today's higher performance locomotives.     

新型农用直埋电力电缆线路综合分析与评价

介绍了新型农用直埋电力电缆系列产品与JB/T 2171标准界定产品的结构差异及特征。通过对新型农用直埋电力电缆使用特性和线路实际运行的调研及综合分析,说明新型农用直埋电力电缆线路较适合农网低压系统应用。进而比较不同线路方案的造价,并对新型农用直埋电力电缆产品制造工艺及市场前景进行评估,认为农网低压线路选用新型农用直埋电力电缆可以实现造价低、线损小、安全、可靠的目的,其已经具备推广和实际应用的条件及市场前景。     

Development of 500-kV XLPE cables and accessories for long distanceunderground transmission line-Part I: insulation design of cables

This paper discusses the results of a basic study for the development of 500 kV XLPE power cables. The authors have established that the factors that decide the performance of today's XLPE cables are impurities in the insulator and protrusions on the semiconductive layer, and that the insulation performance of XLPE power cables is determined by the size of these defects. In model tests of XLPE power cables, the minimum insulation breakdown stress of cables was determined, to set the design values for 500 kV XLPE cable. As a result, it was found that it is possible to design cables having an insulation thickness of 25 mm     

Electrical stress enhancement of contaminants in XLPE insulation used for power cables

The use of XLPE as the insulation for power cables has grown steadily since it first introduction more than 30 years ago. Today XLPE is rapidly becoming the preferred insulation system for even the highest transmission voltages. This preference is due to the high reliability, low dielectric losses, and low environmental impact that can be achieved with XLPE. The positive effects of high quality insulation materials on improved cable performance have been well known since the start of cable making. The purpose of this paper is to investigate the technical background for the cleanliness levels and to quantify the level of performance required from clean materials. The advantages of clean insulation materials are seen at all voltages. However, this work focuses on the technical basis for the benefits for HV and EHV cables, which typically are designed with a water impervious layer to ensure that the cable remains dry throughout its entire lifetime. The presence of metallic contaminants in MV cable is known to enhance the growth of trees by raising the electric stress level locally. The singular impact of cleanliness on the performance of MV cables is somewhat more complicated as it is influenced both by the cleanliness of the insulation and the ability of the insulation material to resist the growth of water trees.     

环保型阻燃电缆料的抑烟新途径

本文分析了国内外抑烟材料的现状,研究了新型抑烟材料在电缆料中的应用。主要介绍了在阻燃乙丙橡胶、阻燃聚烯烃、阻燃聚氯乙烯中的应用,并进行了对比试验,提出了环保型阻燃电缆料的抑烟新办法。     

基于有限元温度场仿真的排管敷设电缆及新增电缆的位置优化

电缆排管敷设设计之初就考虑到了通过增加电缆回路满足后期增容要求。电缆原始及新增位置不同时,断面温度场和载流量也不同,故有必要对电缆原始及新增位置进行优化。以3×4排管敷设配电电缆为例,建立温度场有限元模型,对比温升试验与有限元计算结果,验证了有限元模型的有效性;基于该模型,在各回路加载相同电流前提下,以发热最严重电缆线芯温度最低为依据,对原始6回路及新增1回路进行位置优化。仿真研究表明,电缆分布越分散温度场分布越均匀,发热最严重电缆线芯温度越低;最优新增电缆位置与原电缆位置有关,因而建议在电缆位置优化时应考虑后期电缆回路的增加。     

Testing of Power Cables for the Pulp and Paper Industry

Applications in the pulp and paper industry make special demands on the ability of cables to withstand high temperatures, attack by caustic chemicals, and exposure to fire. Measurement of these capabilities is already encompassed in recognized tests and testing procedures. A great many tests are now prescribed, covering the mechanical and physical?as well as electrical?performance of cables. Generally speaking, these tests can be carried out properly only with the facilities and controlled environment of a laboratory. In-service testing remains a difficult task and presents certain risks and problems. The testing facilities of a modern plant for the manufacture of electrical cables are described.