日本古河电工的阻水交联聚乙烯电缆

为防止水分浸入而引发交联聚乙烯电缆的水树,开发了阻水交联电缆。阻水层采用铅箔与塑料的粘合带,与电缆粘结在一起。这种结构的阻水交联电缆,完全阻水,不须采取防止护套下水分移动的措施;阻水层具有防硫化物渗透和其它化学物质侵蚀的特点。电缆经浸水电压试验、弯曲试验、侧压试验、热循环试验、透水试验证实,性能可靠。     

500 kV交流超高压电缆选型分析

通过在绝缘结构、金属护套结构和外护套结构3个主要方面的技术性能对比,分析对电缆载流量、分段盘长、结构机械性能和工程投资的影响,给出500 kV交流超高压电缆应用设计选型建议:交联聚乙烯（XLPE）绝缘、空气中敷设优选平滑铝护套、环保低热阻的外护套。     

220 kV高压电力电缆阻水结构分析

通过对高压电力电缆阻水机理及水树的形成原因进行分析,说明高压电力电缆阻水性能的重要意义,并指出电缆进水的危害.从纵向阻水和径向阻水两方面进行高压电力电缆的阻水结构分析,并选择合适的阻水材料和工艺参数,表明铝护套深度、节距均对电缆阻水性能产生影响.通过进行电缆阻水性能试验,验证电缆阻水性能满足国家标准要求.     

测量电缆护套厚度和偏心度的超声波监控与调整系统

大多数多对通信电缆一般有一个聚乙烯护套,某些设计则要求一个以上的聚乙烯护套。西电公司长期以来就谋求提供一种能均匀挤包电缆护套的生产工艺。在挤出机中,将管状聚乙烯挤包在缆芯上,聚乙烯护套厚度应十分均匀。为此,就必须解决挤出工艺、监控与调整电缆护套厚度的技术问题。     

防水型交联聚乙烯绝缘电力电缆结构分析

交联聚乙烯绝缘电力电缆因其良好的机械、电气性能和便于敷设、免维护等性能在电力系统中得到了广泛的应用。但是在数十年的运行过程中发现,电缆受潮以后性能会大幅下降,特别是容易引发会严重影响电缆使用寿命和可靠性的水树枝。经过各国专业人员努力攻关,近年来已有不少针对电缆受潮的阻水技术问世,有关新型阻水电缆结构的专利不断出现。根据对国内外文献的检索结果,对当前常用的交联聚乙烯电缆阻水技术进行了分析和分类,并针对交联聚乙烯电缆阻水技术的发展提出了自己的观点。     

矿用电力电缆用弹性材料

合成橡胶的应用,已给矿用电力电缆能承受采矿恶劣环境提供了基础.为适应采矿方式和采矿机械的革新,矿缆绝缘、护套、导电屏蔽用弹性材料配方的当前研制目标,应瞄准安全性和可靠性.现今,以氯丁橡胶或氯磺化聚乙烯作护套、三元乙丙橡胶作绝缘的矿缆,已占主导地位;氯化聚乙烯护套的发展前景尚待实践证明.低烟阻燃混合胶料、低温柔硬性、能承受跳闸所需电流的低压电缆挤出型导电层,则是弹性材料近期研究的内容.     

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.     

500kV电缆的选型

根据500 kV电缆的结构特点,对电缆的绝缘类型、导体截面、阻水结构、金属套及外护套进行介绍,并阐述了选型的依据和原则,选择出适合工程要求的电缆。     

农村通信密封单四线组电缆运行经验

<正> 众所周知,近年来农村电话通信网络的发展主要是广泛采用聚乙烯绝缘聚乙烯护套КСПП型单四线组高频电缆来实现的。为了提高农村电话通信线路的可靠性,研制和采用了防水填充型КСППЗ密封电缆。文中对上述两种型式电缆在可靠性和电气稳定性方     

阻燃电缆的设计

能通过IEC332-3成束燃烧试验的电缆,其所用材料的氧指数该多大以及拟采用何种结构,鉴于国内外对此问题尚无详尽的论述.提出了估计电缆氧指数的公式:??从经济观点考虑,阻燃电缆的设计不能盲目追求技术上的先进性,应尽可能设计出氧指数最低而结构最佳的电缆.为此,推论提出了阻燃电线电缆的最小氧指数:单芯阻燃聚氯乙烯布线为28～30,单层氯磺化聚乙烯电线为30;多芯电缆中,乙丙橡胶绝缘氯磺化聚乙烯护套电缆为28～30,聚氯乙烯绝缘氯丁护套电缆应大于32,聚乙烯绝缘聚氯乙烯护套电缆为28～30,聚氯乙烯绝缘及护套电缆为30,天然-丁苯橡皮绝缘氯丁护套电缆应大于35,交联聚乙烯绝缘聚氯乙烯护套电缆为33左右.     

The Development and Commercialization of Ignition Suppressant, Moisture Barrier Instrument, Control and Power Cables

Plastic coated metal shielding tapes are becoming more and more prevalent in the wire and cable industry. When these tapes are bonded to a chlorinated polyethylene jacket, a moisture/chemical barrier sheath is created that can be utilized in cables for above, ground applications such as in cable trays, in conduit or for aerial use on messengers. These designs can also be used for direct burial and inside buildings. The physical properties of the shielding tapes, combined properties of the tape and jacket, and the properties of various cable designs are all discussed. Additionally, case histories are reviewed which describe the use of these cables in various industrial environments. Specifically, the development of such coated tapes and chlorinated polyethylene jackets provides wire and cable users with additional sheath designs which can be used to reduce expensive maintenance and extend cable service life.     

150-kV and 110-kV XLPE submarine cable installations betweenMorcote and Brusino, Switzerland

The installation of an underwater cable connection in Lake Lugano is described. The cable routing, choice of cross-linked polyethylene (XLPE) as the cable insulation, grounding system, laying methods, protection conduits, cable laying, and accessories are discussed. The submarine described has operated without incident since being placed in service in 1985. The three circuits described, which represent an innovation in submarine cables from both a product and an installation point of view, show that XLPE, when properly manufactured and used with the proper cable construction (a hermetically sealed metallic sheath), can be used as a reliable insulating material even when installed directly in water     

一起500 kV电缆外护套放电故障分析及防治措施研究

交联聚乙烯由于其电气性能、结构轻便等优势被广泛应用于高压交直流电缆绝缘领域,但是近年来因电缆故障导致的停电事件呈现出逐年增多的趋势。文中针对某水电厂主变压器空载充电过程中存在的500 kV交联聚乙烯电缆外护套对夹件间隙放电的问题。首先,利用ATP-EMTP仿真软件建立了全厂一次设备电磁暂态仿真分析模型,对导致电缆铝护套放电现象的故障原因进行了分析;然后,对不同种类的故障治理措施进行比较;最后,提出了针对性解决方案。     

The influence of the water on water absorption and density of XLPEcable insulation

This paper presents the results of a continuing investigation into effect of water on water absorption and density of crosslinked polyethylene (XLPE). The experimental set up was made for the following XLPE cable insulations: steam and dry cured with water tree retardant crosslinked polyethylene (TR-XLPE) and without water tree retardant crosslinked polyethylene (natural XLPE). During tests, the tap water was injected (1) into the cable conductor with cable ends closed, (2) into the cable conductor with cable ends opened, and (3) into the metallic screen with cable ends opened. The XLPE cable insulation together with the water present in the cable was subjected to electrical stress and heating. The results were analyzed theoretically and experimentally. The aim of this paper is to present the results of the influence of the water on water absorption and density of various kinds of XLPE cable insulation in different service conditions     

Effect of water on aging of XLPE cable insulation

Cables as elements of power distribution system have great influence on its reliable service and overall planning requirements. During last years, crosslinked polyethylene (XLPE) cables have been more and more used in power systems. This paper presents the results of an investigation of changing of (XLPE) cables insulation breakdown stress (AC BDS) due to water absorption. The paper deals with AC BDS of the following kinds of XLPE cable insulations: steam and dry cured with water tree retardant crosslinked polyethylene (TR-XLPE) and non-tree retardant crosslinked polyethylene (XLPE). During tests, the tap water was injected into, (1) conductor with cable ends closed; (2) into cable conductor with ends opened; and (3) into metallic screen with cable ends opened. The presence of water in XLPE cables was subjected to electrical stress and heating. AC BDS tests were performed as a function of aging time and water content in the cable insulation at different aging temperatures. Also, in this investigation, tests with the changing of AC BDS in the radial direction of unaged and aged XLPE cable insulations were carried out.     

基于接地电流高压电缆交叉互联故障分析

为降低高压电缆金属护套感应电压,通常在电缆交叉互联箱内将高压电缆金属护套进行交叉互联。但是由于电缆铺设环境的复杂性,交叉互联箱会出现受潮、进水、外力破坏等诸多情形,导致高压电缆金属护套出现交叉互联故障,给整个系统的安全运行埋下隐患。文章针对110k V XLPE高压电缆的交叉互联故障进行分析,利用ATP-EMTP电磁暂态软件进行建模和仿真,分析总结出不同故障下的接地电流变化特点,为高压电缆的故障检测提供理论依据。     

电缆聚乙烯绝缘或护套表面缺陷的成因及解决

电缆聚乙烯绝缘或护套挤出加工温度高,若冷却方式和冷却温度不当,易产生环境应力开裂或表面缺陷。本文对聚乙烯挤出过程中表面缺陷种类和产生原因进行了分析,并提出了解决的措施。     

地下污染水质对电缆塑料外护套非电气性能的腐蚀影响

介绍了一次典型事例，通过水质分析、破坏性试验、表面检查，发现污水对外护套腐蚀很严重。提出了当前情况下和其它污水环境下的地埋电缆处理措施，对同类型情况具有借鉴作用。     

基于护层电流构建新型判据的高压输电电缆在线监测

为及时发现高压电缆交叉互联接地系统中的故障问题,基于电缆金属护层首末两端的接地电流,构造了一种新型判据来实现电缆故障的分类与定位。该方法通过测量电缆交叉互联主段首末两端直接接地箱中金属护层接地电流的幅值与相位,并以同一金属护层回路首末两端接地电流幅值与相位的比值、以不同金属护层回路首末两端接地电流相位差的绝对值构造新的特征量,根据多维特征融合建立故障判据对应的特征量矩阵,以此进行故障诊断。分析了电缆中间接头开路、交叉互联接地箱进水和中间接头短路等常见的电缆故障,并通过仿真验证了新型故障判据的可行性,为高压电缆线路故障的在线监测提供了新的方法。     

高压单芯电缆并联运行时金属护层的联接方式分析

随着经济的发展和用电量的不断增加,同相多根单芯电缆并联供电方式多有采用。高压单芯电缆的金属护套联接方式是电缆敷设时必须注意的问题。目前单、双回路电缆线路感应电压及金属护套环流已有计算,但多根电缆并联使用时的金属护套联接方式还未见讨论。文章研究结果显示并联电缆的护层环流在其护层相联时有可能达到单独处理时的2倍多。因此,电缆并联运行时,不应将金属护套相联再进行交叉互联,而应该分别作交叉互联。