提高10kV配电变压器防雷保护可靠性的措施

分析了现有常规配电变压器防雷保护存在的问题,从多方面提出了提高防雷可靠性的措施。     

建筑电气防火设计漫谈

针对建筑电气防火设计问题,结合现行国家相关规范标准进行探讨;提出了消防用电设备供电系统、控制与保护、配电线路设计及消防联动控制等设计原则;分析了矿物绝缘类不燃性电缆等在电气防火设计中的应用.     

应用配电系统接地安全规范一例

介绍了在一特殊情况下,如何灵活地应用交流10kV及以下配电系统的接地安全规范。     

谈民用建筑电气节能设计

本文阐述了建筑电气节能的现状、重要性、主要内容,从供配电系统、照明、建筑设备等方面,论述建筑电气设计中的几种节能方法。     

配电网优化运行技术的研究与应用

油田配电网为油井举升、油田注水、油气集输加工处理等生产提供动力,在输送电能的过程中．配电网会产生一定的电能损耗。本文重点从配电线路、配电变压器、无功补偿电容器等环节入手,针对目前的技术现状,分析存在的节电潜力,从而为油田配电网优化设计、降低损耗、提高效率找到工作的方向。     

防鸟伞裙的设计及其在配电线路中的应用

针对配电线路鸟害问题,对输电线路常用防治鸟害方法的优缺点进行深入分析,结合配电线路特点及其鸟类的生活习性,设计了一种新型防鸟害装置—防鸟伞裙,并在配电线路推广应用。应用结果表明:防鸟伞裙具有驱鸟和防鸟害双重特性,成功解决了配电线路的鸟害隐患,具有良好的工程实用价值。     

LED路灯设计中的几个问题

通过LED路灯与传统主流路灯——高压钠灯的比较,从理论和实践上说明:(1)LED路灯节能并不如想象中的那么多;(2)LED路灯功率因数高,一般不需无功补偿;(3)LED路灯的色温不是劣势;(4)LED路灯配电线路截面不宜减小;(5)LED路灯标准不统一阻碍其推广。     

架空配电线路的防灾减灾技术

随着社会的发展和生活水平的提升,各行各业对电力的需求也不断增加。为了保证和满足各行各业对电力的供应和传输,近年来架空配电线路的应用也越来越普及。架空配电线路除了要保证质量外,在使用过程中还要注意防范自然灾害的影响。因此,为了保证电力的正常供应,我们有必要加强对架空配电线路的防灾减灾技术的研究。     

Fraction distribution and risk assessment of heavy metals in sediments of Moshui Lake

To examine the status and risk of heavy metal pollution in urban lakes, in China, the distribution of several heavy metals (e.g., Cr, Cu, Ni, Pb, Zn) in the sediment of Moshui Lake, Hangyang District, Wuhan City, was characterized. The process of rapid urbanization and industrialization of the district was also studied to find out its relationship with the metal accumulation profile in the sediment. It was found that the total concentration of heavy metals in the sediment was higher than the severe e ect level (SEL), at all sampling sites, except those in the riparian zone. The Cr and Cu maximum concentrations were 1,780 and 1,250 mg/kg, approximately 16 and 11 times as much as the SEL values, and they appeared as deep as 32 cm in one sample. The carbonate and exchangeable fractions of Zn were more than 50% of the total Zn content, resulting in very high risk according to the Risk Assessment Code (RAC). For Cu and Ni, a medium RAC value was found for carbonate and exchangeable fractions of 11%–20%. As sensitive indicators of contaminants in aquatic systems, heavy metals in the sediment reflect the outcome of regional urbanization, industrialization, and environmental management. With rapid urbanization, sedimentary Pb and Zn concentrations increased. The experimental results showed that high sedimentary heavy metal concentrations had resulted from rapid urbanization and industrialization, which would absolutely lead to substantial aquatic environmental decline in urban lakes.