Effective lightning protection schemes for distribution line

The causes of lightning outage are subdivided into direct lightning strokes and induced lightning strokes, which are identified by the characteristics of the lightning overvoltage. In the past, lightning protection devices were directed mainly toward the latter, and attention has been focused on the installation of lightning protection devices, ground wires, and reinforcement of insulators. However, lightning outages continue to occur. Thus it is extremely important to clarify the fault characteristics of lightning surges and to study the effectiveness of various lightning protection devices by considering both direct lightning stroke and induced lightning stroke in order to prevent lightning outage in the future. In this research, the electromagnetic transients program (EMTP) has been applied to the direct lightning stroke, and the induced lightning outage analysis program for multiple conductor systems has been applied to the induced lightning stroke to study the effectiveness of lightning protection devices provided by combination of various lightning protection devices. The most effective lightning protection schemes are analyzed and evaluated based on verification tests on the full scale models as well as economic considerations.     

徐淮地区煤矿井筒破裂机理研究

从徐淮地区井筒破裂的特点出发，分析引起井壁破裂的根本原因，据此提出井筒的破裂机理，为选择防治井筒破裂的方法提供依据     

离心式空压机轴承技术改造

针对离心式空压机各级轴振动值超标的现象进行技术攻关,解决了制约装置安全平稳生产的瓶颈问题。     

武钢1号高炉长寿炉身新技术

武钢1号高炉经技术改造性大修，长寿炉身采用新技术，长寿炉身采用新技术，高炉炉身冷却采用软水闭路循环，选用新型冷却设备，内衬选用Sialon结合的SiC砖，Si3N4结合的SiC砖以及浸磷粘土砖，采用检测监视等手段，以延长炉身寿命，取消中修，实现高炉寿命15年宏伟目标。     

链条锅炉的节能改造

本文针对株洲硬质合金厂SHL20—13—AII型20t蒸汽链条锅炉存在的问题，进行了节能改造，取得了显著的成效。     

VCM压缩机曲轴断裂失效分析

介绍了锦化化工(集团)有限责任公司出现的VCM压缩机曲轴断裂事故，并从断口的部位、形貌特征，断轴的几何状态、受力状态及树料性能等方面分析了曲轴断裂的根本原因。     

安居水电厂灯泡贯流式水轮发电机组的试运行

本文对安居水电厂2台灯泡贯流式水轮发电机组自投入试运行以来,出现的受油器壳体开裂、导叶接力器缸体和活塞拉伤、转轮桨叶传动拐臂连接销脱落、导叶外轴承座漏水、主轴工作密封漏水侵入水导轴承、锁锭装置固定螺钉剪断等故障的经过、原因分析及其处理办法进行了叙述。     

1422轧机滑块式万向接轴的故障及处理

以热轧板厂粗轧主传动滑块式万向接轴为例，分析了该接轴及接轴平衡机构的常见故障及其排除方法，提出了日常维护措施。     

冷凝水回收技术在立井水暖的应用

采取冷凝水回收先进技术解决了立井水暖锅炉高温冷凝水回收利用问题     

雷电冲击电流测试系统研究

目的 研究雷电冲击电流测试系统，方法 用无感电阻网络分流器测量雷电冲击电流，并进测量重复性、线性度试验和阶跃波响应试验。结果与结论 所研制的无感电阻网络分流器符合国家标准GB/T7626.5-1999和国际电工委员会标准IEC61000-4-5的要求，且可用于KV级脉冲大电流的测量和雷电浪涌（冲击）模拟器短路电流的波形校准。