Urban network constitutes the main part of the power distribution system. It is one of the most essential foundations in urban constructions. Distribution automation system symbols urban power supply quality level. 城市配电网是电力系统的主要构成部分,是城市现代化建设的重要基础设施之一,配电系统自动化标志着城市供用电水平的高低。
The modification could improve the system of power quality, the level of management and the system of anti-interference ability. 此次改造有利于改善系统电能质量、提高管理水平和提高整个系统的抗干扰能力。
The power supply enterprise enters the market and becomes the inevitable choice, as the power supply enterprise, how to supply power to serve quality level and become an increasingly important subject. 供电企业进入市场成为必然的选择,作为供电企业,如何供电服务质量成为一个日益重要的课题。
The application of the normal cloud model to power quality assessment in each level of the junction, based on the normality of the fuzziness of the boundary of the cloud itself, can solve the question of attribution of the boundary values in the vicinity. 应用正态云模型进行电能质量评估,在各等级的交界处,基于正态云自身边界的模糊性,可以解决边界附近数值的归属问题。
The results showed that the detection of high rate of poor vision students, the largest increase in junior high school students, even more worrying is that our students the vital capacity, speed, power, endurance and other quality level showed a continued downward trend. 结果显示,我国学生视力不良检出率居高不下,初中生上升幅度最大,更令人担忧的是我国学生的肺活量、速度、爆发力、耐力等素质水平均呈继续下降趋势。