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Dianci bileiqi高速动车组牵引变压器的设计结构和运行环境与电力变压器有很大差异，掌握其老化绝缘特性对牵引变压器的故障诊断与寿命评估有重要意义。对此，开展不同运营里程的牵引变压器绝缘测试，分析了牵引变压器主绝缘老化特性、变压器酯油老化特性和套管内绝缘老化特性。研究发现随着运营里程的增加，变压器高压套管的最大阻抗谱值呈下降趋势；酯油水分含量超标，致使体积电阻率下降，H2、C2H2和总烃含量均有劣化趋势，但变化不大，一般不作为酯油劣化的评判指标参量；受雷电冲击，高压套管导电棒对周围的空气放电，最终造成绝缘闪络、击穿 ...
宋彦君 +6 more
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Experimental Evaluation of the Electrical Characteristics of Denki-Pan [PDF]
, 2018 We experimentally studied the electrical characteristics of Denki-Pan.
アオキ タカシ, 青木 孝
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Effect of Adding Large-leaf Yellow Powder with Different Particle Sizes on the Quality Characteristics of Dough [PDF]
To investigate the effect of different particle sizes of large-leaf yellow tea powder on the quality characteristics of wheat dough, this study selected five types of tea powder, namely coarse powder, fine powder, ultra-fine I, ultra-fine II, and ultra ...
Chaohua WAN +8 more
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Dianci bileiqi, 2015 研究了动车组车顶受电弓支撑绝缘子紫外线老化特性。通过搭建人工紫外线老化试验平台分别对受电弓用有机复合绝缘子和环氧树脂绝缘子进行强紫外线老化试验研究。研究结果表明,紫外线老化对有机复合绝缘子的憎水性影响不大,但会导致环氧树脂绝缘子憎水性部分丧失;此外,试验前后绝缘子的泄漏电流均变化不明显。
矫立新 +5 more
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Effect and Mechanism of Soluble Dietary Fiber from Corn Bran on Loperamide-induced Constipation in Mice [PDF]
This study was performed to elucidate effects of corn bran soluble dietary fibers (CSDF) on loperamide-induced constipation and changes in intestinal flora in mice. Sixty male BALB/c mice were randomly divided into a normal group, a model group, CSDF low,
Caixia JIANG +4 more
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Effects of Different Pretreatment Oat Flour on the Quality of Extruded Instant Rice [PDF]
To improve the dietary fiber content of extruded instant rice and the application value of oats in extruded instant rice, 6 kinds of pretreatment (high pressure steaming, atmospheric pressure steaming, stir-frying, germination, cellulase enzyme digestion,
Huihui LIU +5 more
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Gaoya dianqi, 2010 笔者系统研究了非晶态聚合物中气隙缺陷的电老化机理。通过对单气隙缺陷以及悬浮电位局部放电特性的检测,确定了单气隙结构与局部放电特性之间的关系,并分析了局部放电对电老化过程的影响。试验结果表明,局部放电的起始电压、放电量、放电电流波形特征以及多周期统计特性都随着气隙结构的改变发生明显的变化。并且气隙中局部放电产生的"空间电荷"对后续放电过程的发展起到了"加速"作用,说明非晶态聚合物中长气隙缺陷局部放电引发的电老化现象与空间电荷量存在着密切的关系。
袁宇春, 高文胜
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Dianci bileiqi, 2014 研究了在连续雷电冲击电流（8/20μs）作用下,35 kV金属氧化物避雷器小电流特性与残压特性的变化规律,以及避雷器内部电阻片的老化特点及失效方式。35 kV避雷器受到连续雷电冲击时,存在一冲击阈值（850次）,当冲击次数低于该阈值时避雷器小电流及残压特性几乎不变,当冲击次数大于该阈值时,避雷器小电流及残压特性发生明显劣化;雷电冲击造成避雷器的失效主要是由内部电阻片沿面闪络引起的,并在避雷器接地端首先发生沿面闪络现象;氧化锌电阻片受到雷电冲击后性能出现方向性差异。该研究为35 ...
王辉 +5 more
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Analysis of Structural Characteristics and Physicochemical Properties of Dynamic in Vitro Digestion Products of Quinoa Starch [PDF]
With the increasing incidence of abnormal glucose metabolism diseases such as diabetes, it is of great significance to explore the structural characteristics (crystal structure, chemical bonds and functional groups) and physicochemical properties ...
Fangjia ZHAO +7 more
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Guangtongxin yanjiu, 2019 在电力系统中,当受到强大的冲击电流时,电力光缆将在高于导体最高工作温度10%的温度场环境下工作,长时间的高温老化工况状态对光纤复合低压电缆（OPLC）光单元中的光纤造成极大的负效应,严重地影响了整个电网的安全运行。针对上述问题,为了研究单模光纤受热前后机械性能变化情况,分析高温老化对光纤的损伤程度,文章通过模拟高于以聚氯乙烯绝缘的OPLC导体温度10%的温度场环境,测试了不同温度和老化时间段下单模光纤的断裂强度、断裂伸长率和光纤涂层剥离力等光纤机械性能,基于测试数据,运用线性拟合的统计方法 ...
伏丽娜 +4 more
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