随着城市的不断发展和人民生活水平的提高,人们对路灯的需求与日俱增。中、小城市的路灯一般都采用单相变压器专供,到了深夜用电负荷减轻,电网电压会升高,路灯变得很亮。而人眼在黑暗中经一定时间就有了适应黑暗的能力,深夜时亮度只要刚天黑的70%就有相同的“感觉亮度”。因此, With the continuous development of the city and the improvement of people’s living standards, people’s demand for street lamps is increasing day by day. Street lights in medium and small cities generally use single-phase transformers exclusively. By the end of the night, the electricity load will be reduced, the grid voltage will increase, and the street lights will become very bright. The human eye has the ability to adapt to darkness in the dark for a certain period of time. When the night is dark, the brightness is just as much as 70% of the sky. therefore,