硬聚氯乙烯护套通信电缆的试制及其敷设

硬聚氯乙烯护套通信电缆,就是将通信电缆的护套改用硬聚氯乙烯塑料,或在普通聚氯乙烯护套电缆外面再挤一层硬聚氯乙烯作为外护套。我省自1971年开始至1974年进行了试制,共生产出四十多公里电缆,已敷设在本省     

关于矿物绝缘电缆的铜护套可作为接地线的探讨

国标GB/T 50169—2016 《电气装置安装工程接地装置施工及验收规范》颁布后,矿物绝缘(BTTZ)电缆的铜护套作为接地线在有些工程验收中引起了争议。通过介绍矿物绝缘(BTTZ)电缆的结构特点,分析铜护套被禁止用作接地线的的原因,解释电缆金属护套和铜护套的区别,对比了铜护套和保护接地线芯的最小截面,依据国家现行技术规范,阐述了矿物绝缘(BTTZ)电缆的铜护套可以作为接地线的观点。     

电缆护套绝缘带电检测方法的研究

电缆护套作为电力电缆的保护层,其性能的好坏直接影响着电缆的安全运行。根据电缆护套实际运行状态,结合电缆的结构,针对电力电缆护套绝缘设计了一套基于直流叠加原理的带电护套绝缘监测系统,利用仿真软件对其可行性进行了分析,在此基础上完成了对整个系统的设计。     

关于电缆内衬层的设计与检验

1.什么是电缆内衬层?它的作用如何?答:在电缆护层中,位于金属护套和铠装间的同心层,叫做电缆内衬层。内衬层主要有两个作用:一是作为铠装的衬垫,使电缆在弯曲时,铠装不损伤金属护套;二是作为金属护套的防蚀层,使金属护套不与外界腐蚀媒质相接触,以防金属护套的腐蚀破坏。2.为什么在电缆外护层标准(JB1072-     

多回路高压电缆金属护套环流计算研究与分析

当高压电缆接地方式不正确,金属护套发生破损或电缆屏蔽层发生断裂破损时,电缆护套环流均会产生变化,因此电缆护套环流可作为判别电缆是否正常运行的重要检测项之一,现实中高压电缆多采用多回电缆并列敷设,使得长距离、多回路的单芯高压电缆线路护套环流问题更加复杂。根据多回路电缆护套环流的模型,设计出一种可计算多回路任意排列电缆的护套环流计算软件,并结合现场实验案例验证了软件的可靠性,同时通过软件计算得出理想的电缆排列方式,为未来电缆敷设提供一定的依据。     

彩色氯丁护套使用的氯丁胶

<正> 我国各主要电缆厂在1980年都先后试制成功彩色氯丁护套千伏级以上的矿用电缆,并在1981年千伏级矿用成套电缆鉴定会上,将6千伏矿用屏蔽电缆的外护套定为红色、1140伏矿缆的外护套定为黄色作为生产技术条件。这种根据护套颜色来区分电压等级的电缆,要求护套的着色鲜明、颜色稳定,     

海南联网海底电缆护套绝缘监测方法

利用基于Matlab所建立的护套感应电流和电容电流模型,讨论了电缆护套绝缘在各种故障情况下护套电流的响应特性。研究发现,海底电缆护套中的感应电流与电缆护套绝缘状态的关系不密切,无论护套绝缘是否发生异常,其感应电流基本保持不变;护套电容电流则与电缆护套绝缘关系密切,而且这种关系呈现出单一函数对应关系,因此,可以从电缆两端测得的电容电流的大小,计算出电缆护套故障的相别、位置等信息,从而实现对海底电缆外绝缘情况的监测。     

耐低温CPE/EPDM护套配方研究

研究了适用于低温条件下使用的电缆护套材料,从基体材料的选择、配合剂的选择、工艺加工等方面进行了探讨。对护套性能进行了测定,实验结果表明,所研制的CPE/EPDM护套材料耐低温性能优良,工艺性能满足生产要求,可以作为风力发电用电缆护套使用。     

中低压电力电缆防水研究和应用

在国内电缆工程施工中,中低压电力电缆基本都采用直埋、穿管或电缆沟等地埋敷设方式。在施工过程中,经常发生电缆护套擦伤、刮破等现象。因此,在地下水位较高或常年多雨地区敷设的中低压电力电缆需采取防水措施。在推广抗水树交联聚乙烯绝缘电缆之前,建议中低压电力电缆可采用防水结构设计,包括挤包聚乙烯内护套作为防水隔离套、纵包铝塑复合带黏结聚乙烯内护套作为防水隔离套和皱纹铝护套作为防水隔离套等。防水结构可以在电缆的内衬层实现,不影响电缆的其他功能（如铠装、阻燃、无卤低烟、防鼠蚁等）。     

水面舰用橡皮绝缘耐水护套电缆

<正> 水面舰用橡皮绝缘耐水护套电缆(以下简称耐水护套电缆)是用在水声设备的声纳换能器上,作为传输信号和接收信号之用。由于电缆长期浸在水中使用,因此它既具有电缆的一般技术性能,又具有独特的护套耐水性能。过去因为没有生产这种专用电缆,故用户大多数采用11号机用电缆。 1.11号机用电缆 11号机用电缆的单线之间存有填充物,所以线芯的柔软度差,电缆弯曲时单线易断。     

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。     

35kV以下电力电缆户内终端用热缩材料研制

本文介绍了 3 5 k V以下电力电缆户内终端用 PE/ CPE共混热收缩材料的研制过程 ,以及 PE/ CPE配比 ,Al( OH) 3 ,辐射剂量等对共混材料的力学性能 ,阻燃性能的影响规律。制得了氧指数 OI大于 2 7,拉断强度 TS>1 0 MPa,绝缘电阻率 ρv>1 0 1 3 Ω· cm,击穿电压 >2 0k V/ m m的户内终端用阻燃热收缩材料     

Extinction of spherulites and improvement of polyethylene properties by the use of lithium carbonate

Polyethylene (PE) consists of nonpolar molecular chains having simple structural units. Physically, this polymer is so stable and flexible that it is widely used for insulation of electric wires and power cables, as well as for fabrication of various molded products. The crystalline texture and the presence of spherulites are major factors determining the mechanical and electrical properties of polyethylene. For the purpose of improving these properties of PE, the spherulites are eliminated completely by heat mixing of PE with Li₂CO₃. PE processed in this manner is free of spherulites, has a uniform structure and excellent electrical, mechanical, and thermal properties, such as short treeing length, high dielectric breakdown strength, and high tearing impact strength. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 148(2): 22–38, 2004; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10296     

ac treeing of ethylene-propylene rubber in cryogenic temperature region

The authors have proved that ethylene-propylene rubber (EPR) is suitable for the solid electrical insulating material of superconducting and cryoresistive cables due to its excellent mechanical and good electrical properties. It is imperative to study the treeing resistivity of EPR in view of long-term reliability as a cable insulator. The objectives of this paper are to establish an ac treeing test method of opaque EPR samples with fillers and to examine the treeing resistivity of EPR at both liquid-nitrogen and room temperatures and the effect of fillers on treeing resistivity. It was found that EPR has enough resistance to ac treeing at liquid-nitrogen temperature and that fillers improve ac treeing resistivity slightly. High reliability of EPR insulation is expected during long-term operation at cryogenic temperature.     

新型智能火灾报警电缆复合材料研究

本文通过分子设计和固相力化学合成方法研究开发了一种具有负温度系数效应的新型智能火灾报警电缆复合材料。其电阻温度系数、材料常数等电气特性可以控制,可用作感温探测器、报警电缆、设备过热保护装置、温度控制器等,使用温度30~250℃。     

Polymer insulated high voltage cables

This article reviews the different components, conductors, semiconductive shields, insulation, sheaths, and jackets, that make up extruded, high-voltage cables. The different types of conductors are described as are the different insulation systems that are available for medium and HV cables. There is a comparison of the two main insulators used in extruded HV cables, EPR, and XLPE. Each material has some properties that are better than those of the other material.     

浅析南非标准中中压电缆的长期老化试验方法

为满足南非国家标准SANS 1339:2010的要求,证明中压交联聚乙烯绝缘电缆的绝缘材料的长期稳定性和抗水树性,中压电缆的长期老化试验已被逐渐重视并采用.根据南非试验方法标准SANS 6284-5:2007要求设计了长期老化试验系统,并得到了南非国家标准局的认可.     

联锁铠装电缆的中外标准解析

电缆联锁铠装护层具有优异的纵向和径向机械性能,是实现电缆安全可靠运行的重要组件,具有广阔的应用前景.比较和分析了国内外标准关于联锁铠装用金属带的材质、尺寸、性能,联锁铠装结构尺寸及质量,以及联锁铠装性能检测评定方法的规定,并对国内外标准的适用性进行分析和总结,为我国联锁铠装电缆的设计、制造和应用提供参考.     

中高压电力电缆用乙丙橡胶绝缘材料的研究

用于电厂封闭母线的电缆、盾构电缆、煤矿用电缆等中高压电力电缆的绝缘越来越多地采用乙丙橡胶。本文研究了适合于中高压电缆使用的乙丙橡胶绝缘材料,从基体材料的选择、配合剂的选择、加工工艺等方面进行了探讨,所研制的乙丙绝缘材料及其制品具有优良的机械电气性能和加工性能。     

Analysis of electrical insulator surfaces by X-ray photoelectronspectroscopy

Our earlier studies centered on understanding the incipient failure mechanism in polyethylene (PE) as an insulation material. The results simulated conditions not measured in routine manufacturing or electric utility test procedures. These findings indicated that detectable changes with pure PE can occur on the surface of cavities (artificially produced), as observed by X-ray photoelectron spectroscopy (XPS). Because the prior studies were done with pure PE and cavities that were made for easy XPS analysis, the question remained “would the findings from the earlier inquiry be relevant to materials used by the electrical utilities?” To answer this question PE insulation was analyzed from a series of commercial type cables that had undergone long-term testing. Occasionally oxygen was found by XPS on the interior surfaces of the more highly stressed PE cable samples. The estimated amount of oxygen was lower than that often found previously. The oxygenated carbon species were similar to those found previously, i.e., alcohols and/or ethers and carbonyls. Some outgassing, probably hydrocarbons, of the PE was observed. The role, if any, of these outgassing components on the failure of PE as an insulation material is unclear