阻燃防鼠型聚氯乙烯电缆护套料的研究

研究了阻燃防鼠聚氯乙烯 (PVC)护套料配方体系中防鼠剂、阻燃剂、PVC树脂、增塑剂、填充剂等对性能的影响 ,从而获得了性能优良的阻燃防鼠PVC护套料     

控制和仪表电缆的选型及应用

1引言从控制中心连接到各系统传递信号或控制操作功能的电缆统称控制和仪表电缆。在20世纪60年代前,即使大型工程建设的自动化控制系统,也都采用传统聚氯乙烯绝缘控制电缆和信号电缆,电缆的主要功能是连接继电器、断路器、指针式仪表和信号灯、开关设备、报警及连锁系统等。近年来,由于弱电和计算机网络的广泛应用,现代工程建设的全面自动化和高精度控制,对控制和仪表电缆的选择和应用提出了新的功能和更高的功能要求(如为满足抗干扰要求对电缆进行对绞屏蔽结构处理等)。文中就近年来控制电缆的选择和使用中出现的一些新问题加以研讨。2控制…     

船用电缆用低烟低卤阻燃氯丁橡皮护套研究

为了降低氯丁橡皮护套燃烧的发烟量和卤化氢释放量,使用Mg（OH）2、Al（OH）3和Sb2D3作为护套的阻燃剂及消烟剂。对护套及其电缆的性能的实验和测试结果表明,完全满足低烟低卤标准要求,其它性能也完全满足电缆相关标准要求。     

在话缆生产线上采用统计过程控制的探讨

本文介绍了统计的过程控制 (SPC)及散点图技术 ,应用话缆的实测数据的分析 ,探讨在市话电缆生产线上采用统计的过程控制的可能性。统计的过程控制是由最佳工艺参数的确定 ,工序认证及操作者认可三部分工作组成的。通过散点图技术的应用可以求出工艺参数的最佳控制值 ;更深入的认识工艺规律 ;采用 Cp～ t曲线可以对产品质量状况进行及时监控。散点图技术及 Cp～ t曲线都可以为提高话缆产品质量提供有用的信息     

浅论耐火电缆质量的控制

本文阐述了耐火电缆的试验方法 ,对耐火电缆的重要组成部分 :云母带的选购、验收及小截面耐火电缆的设计、生产过程中的质量控制进行了分析     

The calculations of conductive noise and heating of the screen in a control cable

Lighting strokes and short circuits (SCs) are the main sources of conductive noise that propagates along control cables and can lead to the failure of microprocessor equipment in the protection and control systems of electric power substations. Two-sided grounding of the screen of a control cable substantially reduces the pulse and high-frequency conductive noise level, but leads to heating of the screen under short-circuit conditions. The existing standards determine the conductive noise and screen heating as a function of screen voltage that is suitable for a single cable. A more general case that takes into account the cable magnetic coupling with other conductors when current is used as a calculation parameter has been considered. The conductive noise at the first pulse of lightning current is determined using the transfer impedance “screen–cable core” or 3D cable model in the general case. To calculate the heating, the formula of GOST (State Standard) 28895-91, which is rejected in modern standards because of the assumption that short-circuit current is invariable (in fact, the current decreases with heating of the screen), has been used. Using this formula in a step algorithm leads to correct results. The cable magnetic coupling with other conductors is expressed as insertion impedance that increases the screen impedance and decreases the current and screen heating. A numerical experiment for a typical cable has shown that conductive noise and heating of the screen of the cable can be substantially reduced because of the parallel laying of conductors. It has been concluded that, to decrease the conductive noise and heating of the screen of a control cable, it is necessary to decrease the screen current.     

Operation control of internally conductor cooled cable system

The development of 275 kV internally-conductor-cooled cable systems is under way for application to long-distance large-capacity (1500 MVA/cct) underground transmission systems. From the viewpoint of the reliability and the energy economy of these systems, the operational control system for the cooling facilities is especially important, because the facilities require large cooling capacity due to the large heat loss of the cable conductor. The cooling device characteristics are described, and the effects of operation control on energy savings are examined. A long-term field test has shown that the computer-controlled operation system is very useful. Simulation results for the operational control system confirm that calculated values are in good agreement with measurement results     

Automatic control system of extrusion of polymer cable insulation

In this paper, problems of automated control of the extrusion of polymer cable insulation and the choice of optimum operating process conditions were considered. The methods and algorithms for automated process control of applying plastic insulation used in the manufacture of cables ensuring the specified product quality were developed.     

无铅防白蚁聚氯乙烯护套料的研制

该文对型号为H-90无铅防白蚁聚氯乙烯护套料配方进行研究,对其中各组份:树脂、防白蚁剂、增塑剂、稳定剂、抗氧剂、润滑剂、填充剂和着色剂等添加剂进行分析总结,得出各组份的最佳配比,以及生产制造工艺和产品性能。     

ADSS光缆的电腐蚀故障和控制

简要分析了ADSS光缆电腐蚀故障的机理，提出了用静态和动态的概念来控制电腐蚀的条件及措施。     

恒温油浴在电缆设备温控系统中的应用

针对线缆行业挤塑设备温控系统的特点 ,本文介绍一种简便易行且能较为精确地测量、校验挤塑设备温控系统温度偏差及参数修正的校验设备与方法。     

控制电缆的选择和使用应注意的几个问题

介绍了电力系统中如何选择控制电缆 ,在使用中如何保证控制电缆正常工作和防干扰等措施和方法     

全塑市话电缆性能分析与工艺控制

本文对全塑市话电缆的线对直流电阻不平衡、工作电容、绝缘电阻、串音等关键的技术指标进行了理论分析 ,对其不合格的原因作了深入探讨 ,并提出了改善各项性能的工艺方法与措施     

The basics of power cable

Insulated power cables can seem to be complicated. In fact, many cables are electrically sophisticated. To simplify we must understand the cable's components and the basics of conductor cables. These fundamentals apply to multiple conductor cables. There are two basic components in a low voltage cable, the conductor and the electrical insulation (dielectric). There are different types of conductors and insulations. Sometimes jackets or armoring are added. As voltage increases other components are added to handle higher electrical stresses. The purpose of this paper is to discuss each component, to help an engineer specify the type components required for specific applications     

对变电站110 V直流电压控制回路

建设变电站采用直流电压110V的控制方式已是国家电力发展的趋势,由此引起的断路器控制操作回路的电压降问题,可通过对操作控制回路电缆截面的计算,结合适当的接线方式和对电缆的正确选型得以解决。实际应用表明,该方法效果良好。     

Comparing US and international power and control cable standards

Cables made to IEC and US standards, while having the same purpose, are of widely different designs. Cables made to one standard cannot be made to match the requirements of the other. The cable made to the US standards have been used in the US and throughout most of the world. The IEC standards have not been widely used in Europe where national and private industrial and utility standards have prevailed. IEC standards have been mainly used in countries where there have not been strong electrical codes. The European Union's adaptation of the IEC standards under the harmonized EN standards of CENELEC adds the force of law to the standards. This will promote a wider use of the IEC (CENELEC) standards on the European continent, although each country could still apply its national rules to the CENELEC standard. This is scheduled to change because all CENELEC European harmonized documents have already been withdrawn and replaced by European Norms. These are the same, word for word, in all European countries. CENELEC members are also members of the IEC and, therefore, do not operate a competitive policy with respect to the IEC. International harmonization of standards must be done at the IEC level. The addition of the CE mark to products meeting CENELEC is similar to the application of the UL mark to products meeting UL standards in the US Worldwide harmonization of standards looks to be a long process. North American and European electrical systems are based on different voltages or frequencies, different conductor sizes, and a different concept of what an electrical system should do     

The fatigue life of lead alloy E as a sheathing material forsubmarine power cables

An experimental investigation into the fatigue resistance of lead alloy E (nominal Sn 0.4%, Sb 0.2%) is detailed, and the results of some 150 individual tests have been treated statistically to provide a convenient method for predicting, to any desired probability level, the fatigue life of this material as a function of the amplitude and frequency of cyclically applied strains. The results are considered in relation to typical requirements of submarine power cable circuits. It is concluded that lead alloy E is an entirely satisfactory sheathing material for such cable circuits     

采用通用变频器实现线缆设备恒张力控制的方法

以线缆设备倒轴机为例,介绍了采用通用变频器来实现线缆收放卷恒张力控制的方法。     

无铅无DOP的PVC护套料配方的研究

介绍了不含铅等有害重金属和 DOP,而且符合美国 U L6 2柔软线及装配线要求的电缆料的研究过程 ,阐述了无铅无 DOP配方中 PVC、增塑剂、稳定剂、防火剂、抗氧剂、填充剂、着色剂等原料的选择要求及配方的安全性能     

防鼠型PVC护套料配方研究

本文分析了防鼠 PVC护套料防鼠性能与防鼠剂用量的关系 ,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 ,介绍了防鼠 PVC护套料配方的研制过程及配方的性能