Jiaxing, Hunan: street lamp management "addition and subtraction" energy saving and efficiency increase

The Jiaxing Nanhu Power Supply Substation has reduced the annual power consumption of the street lamps from 150 million kWh to more than 30 million kWh through a simple “addition and subtraction”, achieving annual savings of nearly 100 million yuan in electricity bills.

By the end of September 2010, more than 90% of the 42,000 street lamps in the Jiaxing City area have adopted energy-saving sodium lamps. In addition, the South Lake Power Supply Bureau also vigorously promotes the LED light source whose power consumption is only 1/8 of that of incandescent lamps, and has installed solar street lights, street-light street lamps, and high-power energy-saving lamps in some sections. The use of these energy-saving street lamps will become a new bright spot for energy saving.

In order to shorten the turn-on time, Nanhu Power Supply Bureau used four-core cable laying in the construction of road lights to create conditions for time-divisional control, forming a full night light, turning off all lights after 22 o'clock and then extinguishing all the way after 24 o'clock. Light mode. At 22 o'clock and 24 o'clock every night, the computer issued an instruction to turn off part of the light source and turn off the light. At present, Jiaxing City has implemented half-night light control for its street lights. After many years of actual operation, the power-saving effect is obvious, with an average annual saving of 50%.

Jiaxing Electric Power Department introduced the street light intelligent control system. The system has the function of “three remotes” and adopts the “light-control priority, time-controlled protection” control method. It can realize the overall and refined control of street lights in the city. Turn off the light illumination limit and the last time limit. Once the measured value of the photosensitive sensor outside the intelligent control room is lower than the lower limit of illuminance, the computer will automatically turn on the light through the wireless network. It can turn on and off the street lamp whether it is sunny or rainy days. Accurately control the time and avoid energy waste caused by early opening or late closing. In this way, 15% of streetlight electricity expenses can be reduced in one year, and the errors caused by manual lighting can also be avoided.

Nanhu Power Supply Bureau also introduced variable power ballasts and street lamp power savers. The variable power ballast uses the principle that the gas discharge lamp can still operate normally when the operating current is properly reduced. By increasing the reactance of the ballast and reducing the current of the light source, the overall energy saving of the street light system is achieved. At present, a number of street lights in Jiaxing City have adopted variable-capacity ballasts, which have obvious energy-saving effects and the energy-saving rate is about 35%. The street light saver installed on some roads can achieve a power saving of more than 30% through step-down and intelligent pressure regulation.