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<正>湖北省英山供电公司于2011年开始全面建设用户用电信息采集系统,至2012年6月完成专用变压器(本文简称专变)用户全覆盖,全县专变成功实现了网上抄表,实时负荷监控。目前,采集成功率已达到98.34%,为电力营销管理提供了可靠的数据支撑。但因许多原因,导致现场数据采集异常,影响了采集成功率。笔者现就如何提高专变终端采集成功率谈几点意见。1数据采集原理用户用电信息采集系统主要采用移动和联通两 相似文献
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110kV线路线损负损查找步骤(1)核对线变关系。将负损线路下现场实际供电的所有配电变压器(以下简称配变,包括公变和专变)进行核查,梳理是否有一体化电量与线损系统和现场实际运行线路不相同的。若存在现场运行线路与线损系统中所属配电线路不相同,则会导致线路售电量统计不正确。系统中所属线路错误的配变,可能引起一条线路高损,另一条线路负损。整改措施:及时把将系统中配变所属线路更正,使线变关系与现场实际一致。(2)核实是否采集失败。核实线路供电关口采集是否失败。若线路供电关口电量采集失败,会造成该线路线损率为-100%。整改措施:及时核查采集异常原因,将异常处理,恢复采集成功率。 相似文献
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<正>某专变客户报故障,称其低压总柜跳闸,客户电工检查未发现任何故障,但低压总开关无法合上,于是报广东立胜电力工程有限公司进行故障排查,抢修工作人员首先怀疑故障是由变压器故障造成,该变压器高压侧额定电压380 V,低压侧有两组绕组分别是210 V和110 V,容量为500 kVA。在现场进行常规的电气测试及绝缘试验,该变压器是1986年出厂,其出厂技术参数已无法找到,而且该变压器投运20年以来未曾进行过预防性试验。试验数据无法 相似文献
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<正>电力客户用电信息采集系统是对电力客户的用电信息进行采集、处理和实时监控的系统。采集终端分为专变采集终端、低压集中器及采集器,本文主要谈谈专变采集终端的安装。专变采集终端是对专变客户用电信息进行采集的设备,可以实现电能表数据的采集、电能计量设备工况和供电电能质量监测,以及客户用电负荷和电能量的监控,并对采集数据进行管理和双向传输。专变采集终端的安装主要有专变采集终端的固定与接线。采集终端的固定安装按照电能表的固定安装即可。终 相似文献
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<正>电能表反向有功走字是计量系统常见故障,笔者现结合自身工作经验对三相智能电能表反向有功走字进行分析,对故障现象进行分类,利用用电信息采集系统(简称采集系统)采集其电压、电流、功率因数等数据信息,研究其特征及规律,分析造成反向有功走字的原因,为现场处理计量故障提供数据支撑和理论依据。 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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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
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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