11O kV电缆内部放电故障分析与机理研究

某石化厂110 kV单芯电缆出现内部多处放电、灼伤外屏蔽层故障,为寻找其故障产生的原因,开展了技术研究,包括电缆剖面结构分析、灼伤点材料成分分析和X射线检测分析,结果表明电缆进水吸潮、铝护套与绝缘屏蔽层之间的间隙较大或阻水带失去半导体性能,都会造成电缆放电灼伤等故障,建议石化企业加强单芯电缆的运行管理并开展电缆在线监测研究.     

110kV电缆内部放电故障分析与机理研究

某石化厂110 kV单芯电缆出现内部多处放电、灼伤外屏蔽层故障,为寻找其故障产生的原因,开展了技术研究,包括电缆剖面结构分析、灼伤点材料成分分析和X射线检测分析,结果表明电缆进水吸潮、铝护套与绝缘屏蔽层之间的间隙较大或阻水带失去半导体性能,都会造成电缆放电灼伤等故障,建议石化企业加强单芯电缆的运行管理并开展电缆在线监测研究。     

硅烷交联聚乙烯电缆在交联过程中铜线芯变色的研究

研究了硅烷交联聚乙烯电缆在交联过程中铜线芯变色的原因,并通过在硅烷交联聚乙烯电缆料中添加助剂来纯化铜的活性,防止铜与其它物质发生反应,有效地抑制了铜线芯在交联过程中的腐蚀变色     

一种直流超高压交联电缆软接头及制作工艺

正本发明公开了一种直流超高压交联电缆软接头及制作工艺,步骤1,导电线芯的焊接;步骤2,电缆接头的导体内半导电屏蔽层的恢复;步骤3,电缆接头的直流交联聚乙烯绝缘层的挤塑恢复;步骤4,电缆接头的直流交联聚乙烯绝缘层硫化;步骤5,电缆接头绝缘外半导电屏蔽层的恢复;步骤6,电缆接头的外层结构恢复。本发明电缆软接头的大截面焊接导体     

航空航天用控制电缆

正一种航空航天用控制电缆。其线芯由铜导体外依次涂有聚酰胺酰亚胺、镀锡层和聚酰胺酰亚胺组成,若干根线芯绞合成缆芯,在缆芯外依次包裹芳纶加强层和交联ETFE材料组成的护套层。线芯中的双层聚酰胺酰亚胺和镀锡层既提高了导     

专利介绍

本发明的目的是提供一种交联聚乙烯绝缘热塑性弹性体护套电力电缆,可有效解决现有技术生产的电缆含卤素量高、易燃烧、燃烧后会产生有毒气体等问题。本发明包括电缆内芯和包在电缆内芯外的电缆外层,所述电缆内芯由内向外依次为导电线芯和绝缘层,所述电缆外层由内向外依次为阻燃包带和护套层,所述电缆外层和电缆内芯之间的空隙内设有阻燃型填充物。     

耐高低温铜带屏蔽电力电缆

正本实用新型耐高低温铜带屏蔽电力电缆,包括多根导体构成的电缆芯,每根导体均包覆绝缘层;电缆芯由内向外依次包覆有铜带屏蔽层、隔氧层、耐火层和护套层,电缆芯与铜带屏蔽层之间的空隙设有填充物;铜带屏蔽层采用铜带绕包,铜带厚度为0.15 mm,铜带重叠搭盖率大于20%;绝缘层和外护套层均采用电子加速器辐照交联乙烯四氟乙烯共聚物绝缘料;填充     

不同温度下风电发电机组聚乙烯电缆老化性能研究

研究风电场环境下交联聚乙烯电缆的老化过程以及温度因子对其老化过程的影响。将电缆用交联聚乙烯的交联反应温度控制策略与电缆运行温度控制策略构建成复合因子,即TB指标因子。通过仿真分析,发现该TB指标因子与电缆老化速率呈对数相关,与电缆运行一年内的鼓包故障和击穿接地事故发生概率呈统计相关。发现电缆老化过程以及其1年使用寿命的控制效果,与该TB指标因子存在显著的统计学关联性。所以,针对特定批次的电缆,其交联反应过程基本一致,则应充分控制电缆运行环境的温度净值、温度变化幅度、温度变化速率等综合温度控制目标,可以充分延缓电缆老化,充分延长电缆寿命。     

交联聚乙烯绝缘电缆在化工企业的运行管理

通过分析交联聚乙烯绝缘电缆的典型事故,阐述了交联聚乙烯绝缘电缆绝缘老化造成事故的原因,提出了化工企业交联聚氯乙烯绝缘电缆的局放试验、介绍了国外电缆试验的新方法,有针对性地总结出化工企业电缆运行的管理方法。     

水力抽真空系统运行小结

自2006年装置蒸发系统增设了水力抽真空系统以来，已连续运行了两年多年的时间，期间也出现了一些异常问题。通过阶段性的总结将历次发生的问题及处理进行归纳汇总，为今后故障处理提供技术支持，可以缩短处理时间，提高生产过程控制水平，维持水力抽真空系统的长期稳定，充分发挥水力抽真空系统降低蒸汽消耗的作用。     

可交联PE电缆用半导电屏蔽料开发现状

综述了可交联聚乙烯(XLPE)电缆用半导电屏蔽料的国内外开发现状,介绍了不同等级XLPE电缆用半导电屏蔽料的原料生产工艺、相关设备、相关标准要求以及国外先进的检验测试方法等,列举了北欧化工公司和美国陶氏化学公司不同等级半导电屏蔽料的牌号和性能。目前,国内只能生产35 kV及以下的电缆屏蔽料,而国外能够生产110 kV及以上电缆屏蔽料。国内开发110 kV以上XLPE电缆屏蔽料是非常有市场前景的。     

废弃交联PE的力化学再生及其与PE-HD共混物性能的研究

采用固相力化学技术,实现了交联聚乙烯电缆料（XLPE）的力化学回收。结果表明：固相力化学方法是实现XLPE热塑性加工的有效手段,经力化学处理后,再生XLPE的拉伸强度为13.7 MPa,断裂伸长率为383 ％。XLPE经力化学处理后表观黏度下降,加工流动性显著改善。将力化学处理的XLPE与高密度聚乙烯(PE-HD)共混,加工性能进一步得到改善,XLPE/PE-HD共混材料的拉伸强度和断裂伸长率分别达到18.5 MPa和500 %。XLPE/PE-HD共混物的SEM断面形貌分析表明,力化学处理可有效改善共混体系中XLPE和PE-HD的相容性。     

Effect of silane‐grafting on water tree resistance of XLPE cable insulation

Water treeing is one of the main deterioration phenomena observed in the polymeric insulation of extruded crosslinked polyethylene (XLPE) cables, which can affect the service life of power cables. In this work, we investigated the effect of grafting of a silane (vinyl trimethoxysilane, VTMS) on the resistance of XLPE to water treeing. A series of water‐treeing tests, the mechanical and dielectric measurements indicated that the silane‐grafting could significantly improve the water tree resistance of the conventional XLPE cable insulation with little influences on its dielectric properties, e.g., the dielectric breakdown strength, dielectric constant and loss tangent, and its mechanical performance. It was found that there exists an optimum value of VTMS concentration (about 0.6 phr) corresponding to the minimum water tree length. The water tree resistance mechanism of silane‐grafted XLPE was proposed on the basis of the process of silane hydrolysis and crosslinking. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Service life of crosslinked polyethylene as high voltage cable insulation

This paper provides a summary of four EPRI-sponsored contracts that studied the physico-chemical characteristics and thermal and electrical behavior of unaged and service-aged crosslinked polyethylene (XLPE)—insulated cables, and sections of the insulation obtained from this extruded cable. It has been demonstrated that volatile components generated primarily from the peroxideinduced crosslinking process can be defined and quantitatively measured. The morphology of the aged and unaged XLPE extruded insulation can be defined, and the thermal behavior on a micro (morphology changes) and macro (cable aging) level compared. Changes in microvoid level due to melting and recrystallization during cable operation appear to correlate with the limited amount of ac breakdown strength data obtained, and thermal overload of the cable conductor causes complete melting (and recrystallization on cooling) reducing the microvoid level. A single thermal overload alters the morphology but many thermal overloads are required to drive off the volatiles.     

Separation,size reduction,and processing of XLPE from electrical transmission and distribution cable

The recycling of power transmission cable insulated with crosslinked PE (XLPE) was investigated by using different methods of separation and reprocessing. Separation was attempted by thermo‐chemical, thermo‐mechanical and microwave‐mechanical means, the latter being the most successful. A mechanism encompassing all of these was formulated. Compression molding, extrusion, and injection molding with and without preheating of the material were also investigated. It was found that by preheating the XLPE and injection molding under high injection pressure, the neat XLPE could be formed into shapes with tensile strengths equal to that of the original insulation. In view of available observations, possible mechanisms for the flow and reconsolidation of XLPE crumb are proposed and discussed.     

行波法在煤矿输电线路故障测距的研究

煤矿井下电缆由于绝缘老化等原因,发生故障是不可避免的,快速地诊断和消除故障,能加快事故后的检修和恢复速度,提高系统运行的安全稳定性。现有的行波故障测距方法,受各种条件制约,测距结果误差较大、可靠性差。针对煤矿井下的特殊条件,提出了一种新的行波故障测距方法。     

10kV配网进线电缆的失压检测

分析10kv配网进线电缆在失压又得电的情况下,计算机后台监控系统发出错误信号报警的原因。采取了有效的PLC失压检测技术,可靠地保障了10kv配网供电系统的正常供电。     

化工企业高压电器开关发热故障的分析与处理

介绍了110kV供电系统中广泛应用的GW4-126型隔离开关存在的发热比较突出,问题,通过对故障点进行解体分析研究,找出了故障存在的原因,提出了处理改进的具体预防措施,以消除此主要供电设备故障对化工生产供电的严重威胁。     

Preparation of Silane-Grafted and Moisture Crosslinked Low Density Polyethylene. Part II: Electrical,Thermal and Mechanical Properties

Among different polyethylene cross-linking methods, such as peroxide, irradiation, and silane cross-linking, silane-based methods are the most suitable methods for producing cable insulation and hot water pipe materials due to process simplicity and superior properties of its product. Some electrical, thermal and mechanical properties of silane-grafted water-cross-linked polyethylene were investigated. The effects of silane grafting and gel content on volume resistivity, tensile properties and melting behavior of low density polyethylene (LDPE) were studied. Results indicated that volume resistivity increased with increasing gel content. Stress at break increased with increasing grafting level and gel content. Elongation at break increased with grafting and decreased with gel content. High temperature tensile properties showed that cross-linked polyethylene (XLPE) is more stable than LDPE at high temperature. In differential scanning calorimetry (DSC) analysis a broad endothermic peak appeared for XLPE due to phase separation. Melting point and crystalline percentage decreased with increased grafting level and gel content. Incorporation of carbon black into XLPE reduced the volume resistivity and degree of crystallization.     

110kV整流直降方式的应用

从重庆市映天辉氯碱化工有限公司10万t/a离子膜烧碱工程的整流设计、选型、实施、谐波论证几个方面,对采用110 kV整流直降方式下谐波对电能质量的影响进行了分析,并论证了采用合理的整流器设计方案的可行性。