Analysis of urban road lighting energy saving

With the rapid development of urban economy and traffic, as the scale and quantity of urban construction is increasing, the power consumption of urban lighting is rising rapidly. How to meet the needs of urban residents and eight guests to live and work, to meet traffic safety, smooth traffic under the premise of promoting low-carbon economy, promote green lighting. In urban road lighting, scientific and reasonable power saving has become an important issue. This article on this topic to talk about their own experience.

A suitable illumination

In our city road lighting energy conservation work, the appropriate lighting is the first to pay attention to the problem. In accordance with the "urban road lighting design standards" CJJ45-2006 standards, according to the nature and scale of urban roads, urban road lighting design. In accordance with the design scheme put forward a variety of lighting standards, comparative analysis of economic comprehensive technology, choose the best surface illumination of advanced technology, reasonable economy and energy saving and lighting power density values. Can not be separated from the "urban road lighting design standards," a one-sided pursuit of brightness, the pursuit of beauty, the pursuit of luxury.

Two, capacitance compensation

The main source of urban road lighting is the gas discharge lamp, the starting current is large, the power factor is low, generally less than 0.45, which will cause the loop current is large, the line produces more losses. "Urban road lighting design standards" require gas discharge lamp should be added capacitor compensation, power factor should not be less than 0.8 after compensation. But the standard is not clear whether the centralized compensation or single lamp dispersion compensation. At present, two kinds of capacitance compensation methods are in use. I think, because the street facilities are evenly distributed on both sides of the road, by the low voltage wiring to long power street lamps, road lighting system loss mainly occurred in this period, the power supply lamp centralized compensation, and can reduce power consumption of low voltage wiring. The use of a single lamp dispersion compensation, no doubt can reduce the power supply to the lamp lamps on this section of the line loss, will play a good power-saving effect.

Three, the implementation of the midnight control

Half of the way in the middle of the night to shut off the power of the effect of direct and significant energy-saving operation time saving up to 50%, the total of about 30%. At present, the city is generally used in the middle of the night to control the way, take the light one by one or two light a measure to close some of the light source, electricity saving effect is very obvious. However, the use of "one by one" or "bright one at two", will result in poor uniformity of road lighting. Unilateral cloth lights, should not promote the closure of half of the light source. If you choose this way, then the gap in the middle of the night lane, illumination uniformity is much lower than the design requirements. In practice, the author believes that the use of dual light source lighting program, two light sources can be equal power or unequal power. When the utility model is used, the two light sources in the middle of the night are all bright, and one light source is turned off after midnight. In this way, the degree of uniformity of the control is not affected, unilateral arrangement, staggered arrangement, symmetrical layout, can use this program.

Four, intelligent light source voltage - voltage - dimming technology,

Intelligent light source buck regulator - dimming technology, is a device installed in the distribution loop at the starting end of the street, in the first half of the total pressure control loop for the street, close to midnight, to reduce the voltage when the car is little. The principle of saving it has two, one is the high pressure sodium lamp lights to maintain the voltage is lower than 198V, the light source will not be extinguished; the second is due to the grid users after midnight, the load is low, the grid voltage is higher than 220V, and the additional part of the electric power consumption voltage, the device can avoid the waste of this part. According to the engineering practice, it can save about 15%. The utility model not only saves the electric energy, but also does not affect the uniformity of the illumination, and can avoid the over running of the light source, and prolong the service life of the light source electrical appliance. It should be noted that this way is to reduce the power distribution circuit, all the lights in the loop will be operating at low voltage. Because the lamp power supply radius distribution circuit of up to 800 meters, with the increase of distance and power supply voltage of the lamp, decreased gradually, if the line is designed properly, there may be remote voltage can not meet the required to maintain normal voltage source.

Five, the use of variable power ballast

Variable power ballast, using the gas discharge lamp in the appropriate to reduce the working current, can the normal operation of the principle, through the night to increase ballast reactance, thereby reducing the source current to achieve the overall objective of the system of energy-saving lamps. This way is installed in the lamp, can be applied to a variety of street lighting and light source combination. On the original road lighting project, can also be used in addition to the variable power ballast for the transformation of the original lamps and lanterns of the ballast is not replaced, not only facilitate the transformation of construction, but also reduce the cost of the system.

Six, intelligent lighting control system

Back in the early 90s, developed countries have been widely used in intelligent lighting control system to reduce the cost of urban lighting. The national development and Reform Commission, the Ministry of construction, State Bureau of quality and technical supervision in 2000 issued a document No. 223 "on the" Chinese green lighting project "opinions" further, put forward to promote energy-saving intelligent lighting control system, to carry out the work of energy-saving green lighting. Intelligent lighting control system for lighting equipment to provide a variety of automatic control functions, through computer control and management software to achieve fault free intelligent and unattended. Not only save a large part of the comprehensive cost, convenient for pedestrians and vehicles, but also can prolong the service life of the lamp on average more than 2 times, reduce the number of lamps loss, saving cost and replacement lamp engineering costs and maintenance fees. In addition, it also reduces the workload of maintenance personnel. More importantly, in many places, the replacement of lamps is very difficult and dangerous, industrial accidents occur, the extension of lamp life can greatly reduce the occurrence of this risk. Improve safety reliability.