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江苏省响水县中学新建一座教师宿舍楼。建筑物长97m,7层,距离学校配电室390m,采用三层三相四线架空线路送电,导线截面为LGJ-90,沿途用电建筑物有教学楼、学生食堂、学生宿舍、综合楼和实验楼等。由于沿途用电量较大,新建的2号教师宿舍楼又是送电末端。配电室电压已调到400V,功率因数cos(?)为0.8。工地施工用电总容量为78.7kW,有2部塔吊,每台塔吊主电机为11kW,当一部塔吊重载启动时,电压下降到280V、功率因数cos(?)为0.5,无法启动,工地无
Xiangshui County, Jiangsu Province, a new teacher building dormitory. The building is 97m long and 7 floors long. It is 390m away from the distribution room of the school. It is powered by a three-layer three-phase four-wire overhead line with a cross-section of LGJ-90. There are teaching buildings, student canteens and student dormitories Building and laboratory building. Due to the larger electricity consumption along the way, the new No. 2 teacher dormitory is the power transmission terminal. Distribution room voltage has been transferred to 400V, power factor cos (?) Is 0.8. The construction site has a total power consumption of 78.7kW, with 2 cranes, each with 11kW. When a crane is heavily loaded, the voltage drops to 280V, the power factor cos (?) Is 0.5 and can not be started. The site no