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电气设备是选矿厂中重要的设备,被广泛应用到工作当中,电气设备的运行性能和寿命以及电气运行的安全性能在选矿厂中有重要的地位,也是当前工作人员着重关注的问题。随着科学技术的发展和电气厂实践活动的深入,电气设备变得复杂多样,电气设备的安全运行管理和维护已经成为了技术人员的重点研究课题。笔者根据自己的实践经验,提出了几点管理和维护的策略,希望能够为选矿厂电气设备安全运行管理和维护提供参考。 相似文献
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现阶段,高压电气试验设备种类十分繁多,在技术控制上又很难把握。为了提高高压电气设备的安全运行和维护工作,需要检测高压电气试验设备的运行状态和绝缘性能,从而快速找到高压电气设备中的存在问题,分析高压电气设备技术改进工作,以提高高压电气设备的安全指数。分接开关过渡时间试验、极性试验、直流泄露电流试验、绕组变形试验和变压器油试验都是高压电气试验的范围,想要这些试验数据测试准确,就需要依靠相应的设备完成。因此,在高压电气试验中优化技术十分关键,对于提升高压电气设备的绝缘性能和安全运行状况起到了十分关键的作用。 相似文献
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接地装置及其运行维护 总被引:1,自引:0,他引:1
电气设备的任何部分与大地(土壤)作良好的电气连接称为接地.接地是确保电气设备正常工作和安全防护的重要措施.电气设备接地通过接地装置实施.接地装置由接地体和接地线组成,与土壤直接接触的金属体称为接地体;连接电气设备与接地体之间的导线(或其他导体)称为接地线. 相似文献
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1 电气设备绝缘状况的好坏对电气设备的正常运行和安全用电有着很大的影响.因此,凡新装、检修或停用时间较长的电气设备,在投运前要进行绝缘电阻测试.2 测量电气设备的绝缘电阻应选择与被测电气设备额定电压相适应的兆欧表.不能用电压过高的兆欧表测量低压电气设备的绝缘电阻,以免损坏设备的绝缘.通常,额定电压在500V以下的设备选用500V兆欧 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献
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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献