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复合外套金属氧化物避雷器起痕及电蚀试验浅析 总被引:1,自引:1,他引:0
介绍了复合外套金属氧化物避雷器起痕和电蚀试验方法,针对试验中出现的主要问题作了简要分析;并提出了可有效提高复合外套氧化物避雷器耐漏电起痕和耐电蚀特性的建议。 相似文献
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复合外套氧化锌避雷器 总被引:3,自引:3,他引:0
详细介绍了国内外复合外套氧化锌避雷器的发展状况;着重阐述了热硫化型硅橡胶和室温硫化硅橡胶的配方、加工方法和材料性能等方面的内容;最后较详细地介绍了复合外套氧化锌避雷器的结构、制造设备和制造工艺。本文为复合外套氧化锌避雷器的制造和使用部门提供了大量的技术参数。 相似文献
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按照GB/T 22389-2008、GB/T 25083-2010有关直流避雷器标准中相应条款的要求,建立了一套直流系统用复合外套避雷器耐电痕化和蚀损试验设备。选定了5个典型产品作为研究样品,进行了一系列耐电痕化和蚀损试验,并对试验程序和方法进行了深入分析和研究。在比较GB/T 22389-2008、GB/T 25083-2010、GB 11032-2010和IEC60099-9:2012(CD)试验项目异同的基础上,建议我国应采纳IEC标准的名称和试验方法,对GB/T 22389-2008、GB/T25083-2010中的耐电痕化和蚀损试验项目进行修订,以满足我国特高压直流建设发展中对避雷器试验和检验的技术需求。 相似文献
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复合绝缘具有重量轻、机械强度大的特点,采用复合绝缘的线路避雷器被广泛用于提高输电线路的耐雷水平,降低雷击跳闸率。然而,复合护套的硅橡胶材料长期运行于户外环境中,一旦材料特性不佳,将容易老化甚至造成其发生闪络。分析了一起运行10年的复合绝缘线路避雷器因外护套老化而发生沿面闪络的故障,经过交直流耐压及局放试验研究后,将故障避雷器进行了解体,并对外护套进行了理化实验、硬度试验、电镜试验、户外暴晒场试验。结果发现其故障原因是硅橡胶绝缘老化和硅橡胶同玻璃钢材料的界面结合不佳,造成憎水性消失和局部放电所致。通过分析,给出了复合绝缘线路避雷器的相关运行建议。 相似文献
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对硅橡胶外套金属氧化物避雷器上的污秽效应不容易试验或计算。事实上硅橡胶的天然憎水性限制了沿表面持续流动的大泄漏电流,因而不可能用新的避雷器进行试验,尤其是用采用涂污法时更为困难,因此,进行预处理是必要的。为了评估在重污秽条件下硅橡胶外套高压避雷器的性能,已进行了一些试验和计算。 相似文献
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一起110kV避雷器事故分析及引发对线路终端避雷器运行管理的思考 总被引:1,自引:1,他引:0
通过对1起110 kV线路终端无间隙复合外套金属氧化物避雷器爆炸事故同批次试品的解体检查试验,指出整体密封性能较差导致运行受潮,是加速了电阻片老化的主要原因;针对线路终端避雷器运行条件和运行管理的薄弱环节,提出运行管理和试验维护建议。 相似文献
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介绍了国内线路防雷的主要措施和运行情况,指出线路型无间隙避雷器主要悬挂于线路两端及进出变电站的第一个塔上,用于提高整条线路的绝缘水平;也安装在进出变电站的第一个杆塔,减少入侵雷的幅值。线路型带串联间隙避雷器主要悬挂于雷击多发区的输电杆塔上,保护线路绝缘子串免受雷电过电压引起的雷击闪络。检测主要采用泄漏电流监测、红外测温及紫外成像等方法;测量无间隙避雷器交流泄漏电流即全电流分量及其阻性分量,是带电测试线路型无间隙避雷器的主要方法。在条件允许的情况下,还应结合红外测温、紫外成像方法对避雷器进行监测,并做出正确的评价。对线路型带串联间隙的避雷器加装故障指示器为可能出现故障的避雷器提供标示,但应结合停电试验结果对避雷器的质量状况做出正确的评价。使用线路避雷器时应注意准确地选择保护范围、安装点及日常维护。 相似文献
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价值工程在服役结构加固维修决策中的应用 总被引:3,自引:0,他引:3
运用价值工程的基本原理和方法 ,讨论了在役结构加固、维修活动中应遵循的价值准则。不仅考虑了维修决策时的经济因素 ,还注重对维修后结构的功能状况的评估。证明通过运用价值工程方法进行房屋维修决策 ,可提高决策的正确性 ,为业主提供一种科学的技术经济决策方法 相似文献
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线路型500kV避雷器保护范围的研究 总被引:1,自引:3,他引:1
通过建立 5 0 0 k V线路安装线路型避雷器的模型 ,运用 EMTP程序计算 ,得到并讨论了雷电反击和绕击情况下避雷器的保护范围和它与操作过电压下的保护范围的不同 相似文献
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指出适用性是衡量商品住宅性能的重要指标之一,在分析了商品住宅适用性性能指标体系的基础上,探讨了基于模糊数学的综合评价方法,利用此方法对商品住宅适用性能作了客观评价,为用户购房和政府主管部门对商品住宅的性能评价提供依据。 相似文献
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《Structure and Infrastructure Engineering》2013,9(3):409-418
Infrastructure condition assessments provide key information for monitoring the quality of infrastructure, planning and budgeting of maintenance and rehabilitation activities and establishing performance goals. Although the literature is rich in condition assessment methods for roadway pavement and bridges (and to some extent for traffic signs), it is lacking such methods for roadside assets. This paper describes the development and validation of a condition assessment method for 12 roadside asset types and maintenance activities that are related to roadway safety, drainage, cleanliness and vegetation. These assets and maintenance activities are located in the area between the outside edges of the outside shoulders and the right-of-way boundaries. On divided highways, the median is also included. The developed condition assessment method consists of a set of performance standards, a visual inspection procedure to assess compliance with these standards and a statistical analysis procedure to determine the roadside level of service. To test and validate the developed method, it was applied to five highway corridors in Texas, USA, representing different climatic conditions, topography, traffic volume and population density (urban vs. rural). These field trials provided insights into the developed method, including practicality, reproducibility and probability distribution function which best represents the sample unit score. 相似文献
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沪闵高架道路二期工程节段梁桥梁健康监测系统 总被引:2,自引:0,他引:2
上海沪闵高架道路二期工程中针对节段拼装连续箱梁结构,建立了桥梁健康监测系统。文章介绍了该系统的监测原理和监测方法,通过对节段拼装连续箱梁结构的体内索锈蚀情况和体外索索力、挠度的监测,管理养护单位可以进行桥梁健康状况研判,为桥梁的管理养护提供新的检查手段,是一次有益的探索和尝试。 相似文献
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Anaerobic digestion is a suitable method for the treatment of wastewater and organic wastes, yielding biogas as a useful by-product. A common way of preventing instability problems and avoiding acidification in anaerobic digesters is to keep the organic load to the digester far below its maximum capacity. An improved way of operating digesters would be to use monitoring and control systems for increased organic load under controlled conditions such that the digester performance is improved. The partial alkalinity, which indicates the bicarbonate concentration, has in many cases been found to be a suitable parameter to monitor. Here, an automated monitoring system for alkalinity measurements is described. It is shown to be applicable for measuring a wide range of bicarbonate concentrations. The system shows potential for monitoring anaerobic digesters as it responds to the alkalinity of digester effluent, as well as being stable over a relatively long time span with few maintenance requirements. 相似文献
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An empirical method was developed for the prediction of the service life of building components, based on an evaluation of their actual performance and on the identification of failure mechanisms affecting their durability. The service life of exterior components subjected to normal service conditions is predicted. Four types of exterior claddings are exemplified: cementitious mortar, synthetic rendering, ceramic mosaic, and wet‐fixing stone cladding. The proposed prediction models yield high degrees of fit to the data (R 2 in the range of 0.86 to 0.93 at a 0.0001 level of significance). Life cycle costs (LCC) analysis – following service‐life prediction results – leads to the conclusion that maintenance and replacements costs account for 10–80% of initial capital costs. Synthetic rendering exhibited the highest LCC effectiveness, reflecting durability and low capital costs. The method can be used for planning preventive maintenance, evaluating economic implications of failures, and planning service life. 相似文献