共查询到19条相似文献,搜索用时 375 毫秒
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传统的防火耐火母线槽、电缆主要有氧化镁防火绝缘和云母带缠绕耐火两种结构。氧化镁绝缘电缆的生产设备昂贵、造价高。云母带缠绕的耐火母线槽、电缆,接缝处易出现缺陷且烧蚀后的云母带发脆、易脱落、耐火性差。陶瓷化防火耐火硅橡胶是防火耐火母线槽、电线电缆的一种"革命性"新材料,可用于生产防火耐火母线槽及电线电缆。陶瓷化防火耐火硅橡胶最关键特点在于,被烧蚀后形成的坚硬壳体仍具有电绝缘性,可保护输配电线路不受火焰侵蚀,从而保证电力、通信的畅通,为火灾情况下人员的疏散和抢救赢得宝贵的抢救时间。陶瓷化防火耐火硅橡胶的主要产品有陶瓷化防火耐火硅橡胶、陶瓷化防火耐火复合带和陶瓷化防火耐火填充绳。 相似文献
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硅橡胶绝缘耐火电缆的开发与研究 总被引:4,自引:2,他引:2
近年来,随着经济建设和电力事业的发展,硅橡胶绝缘耐火电缆和电线的应用愈加广泛,其使用数量也逐年增加,并发展成为耐火电线电缆的一个专用系列产品。该文主要对硅橡胶耐火电线和电缆的研究实验和运行实践作一阐述,旨在促进我国耐火电线电缆科学技术水平的进一步提高与发展。 相似文献
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介绍了一种新型硅橡胶绝缘无卤低烟阻燃耐火控制电缆的技术指标、产品结构,重点阐述了新结构耐火电缆具有卓越的耐火性能。 相似文献
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研究了加热器用平行橡胶软线用105℃氯化聚乙烯绝缘橡胶的配方,并对橡胶、填料、增塑剂、稳定剂、润滑剂、阻燃剂进行选择后,确定了该绝缘橡胶的配方,胶料的性能达到美国UL标准要求。 相似文献
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传统高温硫化(HTV)硅橡胶复合绝缘子以其优异的憎水性和憎水迁移性,广泛应用于国内外输电线路上。但随着特高压工程的开展,越来越多的输电线路需要跨越强紫外辐射、强风沙以及鸟啄频发地区,而在这类气候恶劣地区极易造成传统HTV硅橡胶绝缘子外绝缘性能的下降以及材料的损伤。针对这一情况,采用耐紫外线、耐气候性能强,机械性能稳定的高聚物复合绝缘子与传统HTV硅橡胶绝缘子在紫外老化性能方面进行对比,旨在研究高聚物复合绝缘子在西北高原强紫外辐射地区的老化特性。研究结果表明:在短波紫外光(UVC)持续照射下,环氧材料的拉伸强度和硬度均远高于硅橡胶,具有更好的韧性,已达到防鸟啄和耐踩踏的目的,但憎水性相比较于硅橡胶材料仍略有不及,但仍满足户外运行要求。 相似文献
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Haifeng Gao Zhidong Jia Yingke Mao Zhicheng Guan Liming Wang 《Dielectrics and Electrical Insulation, IEEE Transactions on》2008,15(2):435-443
According to hydrophobicity and hydrophobicity transfer studies on silicone rubber surfaces, although the silicone rubber can transfer its hydrophobicity to various contaminants deposited on its surface, the hydrophobic states of water droplets on clean silicone rubber surfaces and on various contaminated silicone rubber surfaces were found to be different based on evaluation by contact angle measurement. Furthermore, surface discharge and aging of materials decreases the hydrophobicity of the surface. Focused on the difference of hydrophobicity and the effect of water droplets on the hydrophobic contaminated surfaces, some contrastive computations and tests of water droplets on various surfaces were carried out in this study. The results showed that the water droplets existing on the surface of silicone rubber materials might change the electric field and voltage distribution along the surface, and even reduced the initial voltage of the corona discharge, which was verified with a comparison test on a high voltage side of polymer insulator monitored by a photomultiplier tube (PMT) system. Since the leakage current provides much useful information to diagnose the state of outdoor insulation, this study investigates the time and frequency distributions of surface discharges on ceramic insulators, new room temperature vulcanized (RTV) silicone rubber coated insulators and aging RTV insulators with various hydrophobic states with the short time Fourier transform and Gabor transform methods. Then a correlation was found between the distribution of the spectrum of surface discharges and hydrophobicity via the joint time and frequency analysis of discharges on various hydrophobic surfaces. 相似文献
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Chang J.W. Gorur R.S. 《Dielectrics and Electrical Insulation, IEEE Transactions on》1994,1(6):1039-1046
Results of a study performed to obtain a better understanding of the material characteristics responsible for hydrophobicity recovery leading to a high wet surface resistance in silicone rubbers used for outdoor HV insulation, are reported. The samples were obtained from new and artificially aged HV insulators using HTV silicone rubbers (3 different formulations) as weathershed and RTV silicone rubbers (2 different formulations) as a protective coating. The main experimental facilities employed consist of a salt fog chamber for artificially aging the insulators, and a scanning electron microscope (SEM) for material studies. New results of practical significance that have emerged from this study are: (1) hydrophobicity recovery, predominantly due to diffusion of low molecular weight (LMW) silicone polymer chains, occurs with only a fraction (<20%) of the total LMW polymer content initially available in an unaged material surface, (2) LMW chain regeneration and hence surface hydrophobicity recovery occurs even after the initial supply of LMW polymer is depleted, and (3) hydrophobicity recovery is significantly affected by ambient temperature. The results show the same pattern for different formulations of HTV and RTV rubber materials studied. The X-ray Mapping feature in the SEM provides a visual indication of the diffusion process which is a noteworthy contribution 相似文献
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针对在役复合绝缘子的老化问题,笔者分别对实验室电晕老化和现场自然老化的HTV硅橡胶材料的憎水性、泄漏电流、表面微观形貌以及化学成分等特性进行了对比研究。结果表明,电晕老化与现场老化造成材料特性变化的规律呈现一致性:电晕老化造成材料憎水性下降,且提高电晕老化强度(电压和时间)则导致憎水性恢复变慢,甚至不能完全恢复;现场老化材料的憎水性随年限不断下降,由HC1级(2年)降至HC5级(15年)。老化还造成样品的表面电阻率下降,引起表面泄漏电流增加;老化造成硅橡胶材料降解,表面缺陷增加,孔洞增加并加深,甚至产生裂纹,同时生成强极性基团等,从而引起硅橡胶机械及绝缘性能不断下降。 相似文献