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在水泥厂6kV或10kV的配电系统中,往往要用电缆输送数万千瓦的电能,最大供电距离近1000m。三芯电缆的截面过大,运输及敷设均比较困难,且同截面的单芯电缆比三芯电缆载流量要高,所以在许多工程项目中往往选用大截面单芯电力电缆。然而由于单芯电缆结构的特殊性,其在敷设方式上也有其特殊性,单芯电缆金属屏蔽层接地方式的选择便是其中之一。本文针对中压单芯电缆的金属屏蔽层的接地方式选择进行探讨,并通过计算给出初步结论。 相似文献
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由于仪表用屏蔽电缆施工不规范、电缆老化等原因,现场设备正极或负极与屏蔽层接触,使原浮空供电方式转变为直流正/负极接地,易造成信号线短路引发设备误动作。为防止由于仪表电缆屏蔽接地问题对正常生产造成影响,总结硫磺装置仪表工作接地异常问题分析处理方法和预防措施,分析与处理方法可为仪表维护和故障判断作参考。 相似文献
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针对玉门压气站西门子电驱压缩机组变频驱动系统动力电缆及阻尼电阻击穿烧毁事故,现场进行检查检测处理,着重对可能造成单芯电缆击穿烧毁故障的各种因素进行探析,分析可能发生故障的原因,并采取了相应的措施,提出了相关建议。 相似文献
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<正>1出现的故障某水泥公司石灰石矿山输送皮带机长9.3km,2007年6月投入生产,运行几周后,2台拖动电动机的电缆相继被击穿,于是将电缆更换成高压电缆,耐压等级10000V,3芯,并有屏蔽层,此后电缆不再被 相似文献
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本发明涉及含半导电屏蔽材料和湿固化绝缘材料的电力电缆,特别是含有粘性半导电屏蔽内层的电力电缆。
标准电力电缆的电缆芯线通常含有一个或多个导体,电缆芯线周围被多层聚合材料包围,这些材料包括第一半导电屏蔽内层(导体或绞线束屏蔽层)、绝缘层、第二半导电屏蔽层(绝缘屏蔽或外半导体层)、金属带或金属线屏蔽层及保护套。半导体屏蔽内层通常都是粘合而成的。半导体屏蔽外层可粘结在绝缘体上也可放在其上。湿化密封材料也可加入包围层中。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献