Studies on the Effect of Accelerated Thermal Aging on Electrical and Physicochemical Properties of XLPE Cable

The degradation of crosslinked polyethylene (XLPE) cable insulation during service, such as thermo-oxidation and water treeing may lead to a premature electrical breakdown of the XLPE insulation cables. Therefore, it is necessary to optimize the period of replacement to evenly distribute the replacement cost by ascertaining the deterioration degree. Estimation of the aging degree is at present the most important task for diagnosis of the residual lifetime of the power cable insulation. This paper presents a study on the changes in the dielectric properties of the thermally aged XLPE cables in the frequency range from 0.07～10 MHz. Based on electrical and physicochemical characterization, some new "dactylograms" for the thermally aged XLPE cable insulation have been proposed.     

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结合施工组织探索岩溶注浆单价分析

介绍了岩溶注浆加固路基的原理。并通过施工组织分析出岩溶注浆中工料机的消耗，从而探索、研究一种地质条件下的岩溶注浆单价分析。     

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故障88 故障现象:一辆本田CM125太子款摩托车行驶约3.6万km时出现了动力下降现象,维修工检查点火系统时发现,该车磁电机飞轮存在失磁现象,造成发动机难起动.因无进口配件,只得用CB125T飞轮组件代替,配件更换后,加速性能仍然较差,维修工又检查了点火系统,更换了火花塞、点火线圈、CDI均无效.     

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