排序方式: 共有18条查询结果,搜索用时 15 毫秒
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变压器直流电阻不平衡度超标的原因的几点分析 总被引:1,自引:0,他引:1
三相变压器直流电阻不平衡度超标不仅对变压器本身,也对与其相连的其它设备正常运行有危害。分析了三相变压器在生产过程中由引线电阻、导体材质和引线结构、部件连接不紧、分接开关、内部故障所导致直流电阻不平衡度超标的原因,并在分析的基础上提出了相应的查找方法。 相似文献
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重点针对电压互感器中的一种电容式电压互感器的常见故障进行一些总结,并提出一些应对手段,供同行参考。 相似文献
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介绍了建筑工程施工项目中对混凝土外观检查和混凝土强度的质量检查,主要从检查的指标和控制方法等方面进行了探讨和阐述。 相似文献
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尹越 《创新作文(初中版)》2011,(5):16-16
成长的年轮在飞速旋转 日子在脚下踩出细碎的声响!曾经的记忆已酿成芬芳 沿着成长的足迹 我已经悄然长大 日子编织着希望的彩带 装点着我的青春梦境 在风平浪静的日子 我提醒自己无止境地努力 在鸟云密布的日子 我鼓励自己无畏惧地前进 相似文献
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Experimental research and numerical analysis were applied to study the ultimate load capacity(ULC) and reinforcement of circular-hollow-section N-joint.Four specimens were tested under static load.The ULC of each specimen was obtained and the detailed failure conditions were discussed.Based on the results, both welding a plate on the chord member and filling concrete in the chord member are effective to reinforce the N-joint, but it is suggested that these two methods should not be applied simultaneously.Mo... 相似文献
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Due to traffic and wave actions, cast steel joints are subjected to variable-amplitude fatigue loading, which may cause fatigue problems. The ratio of the minimum strain to the maximum strain(strain ratio)can be employed to analyze the influence of variable-amplitude fatigue both in the elastic and plastic ranges. To evaluate the effect of the strain ratio on G20Mn5QT cast steel, the fatigue tests of smooth specimens were carried out at the strain ratio of 0.1. The cyclic deformation and the relationships between the strain amplitude, the stress amplitude, the Smith, Watson and Topper(SWT)parameter and fatigue life were studied and compared with those at the strain ratio of -1. Compared with other methods, Basquin formula and Solonberg formula provide reliable and appropriate ranges of S-N curve and fatigue limit at different strain ratios respectively. The SWT parameter can be used to predict the fatigue life at other strain ratios accurately. 相似文献
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天津大学游泳馆屋顶采用波浪形网架结构 ,造型新颖、独特 ,很好地体现了建筑物的使用功能 .采用波浪形网架与下部钢筋混凝土框架相互作用的整体计算模型 ,对该网架进行了分析和设计 ,同时 ,对该类波浪形网架的抗震性能进行了研究 . 相似文献