With the city’s economic construction and the rapid development of transportation, urban construction as the increasing number of large scale and lighting, urban lighting electricity consumption is also rising rapidly. How to meet the city residents and visitors from all live and work requirements, to meet the traffic safety, traffic smoothly under the premise of promoting low-carbon economy, promote green lighting. In urban road lighting, scientific and rational energy saving has become an important topic. This article on this subject to talk about their experiences.
First, the appropriate illumination
In our city road lighting energy-saving work, proper illumination is the first to attention. We want to follow, “city road lighting design standards” CJJ45-2006 standards, according to the nature and scale of urban roads, for urban road lighting design. Meet the requirements of a variety of lighting standards proposed design, undertake a comprehensive technical and economic analysis and comparison, to choose the technology advanced, economical and optimum road illumination energy conservation values ??and lighting power density values. Not be divorced from “urban road lighting design standards”, one-sided pursuit of brightness, the pursuit of beauty, the pursuit of luxury.
Second, the capacitance compensation
The main city road lighting source is a gas discharge lamp, the starting current, the power factor is low, generally 0.45 or less, this will result in large current loops on the line to generate more losses. “Urban road lighting design standards” requirement should be added to the gas discharge lamp capacitor compensation, power factor compensation shall not be less than 0.8. However, the standard does not explicitly single lamp is concentrated dispersion compensation or compensation. Currently two kinds of compensation capacitors are in use. I think, as street lighting facilities are evenly distributed on both sides of the road, by the power to low voltage wiring long street lamps, road lighting system produces losses mainly occurred in this period, the use of lights at centralized power compensation, does not reduce the pressure power wiring. The use of a single light dispersion compensation, will undoubtedly reduce the lamp power to the lamps which generate a loss on the line, will play a good energy-saving effect.
Third, the implementation of control at midnight
Turn off the light source at night half way direct and significant energy-saving effect, saving operation time saving up to 50%, overall about 30% or so. Currently, the city control method commonly used in the night, to take “every one bright one” or “bright one every two” measures, the closure of some light, energy-saving effect is very obvious. However, the use of “bright one every one” or “one every two bright” mode, it will cause bad road illumination uniformity. Unilateral cloth lamps, light sources should not promote close half way. If you choose this approach, the disparity between light and dark lanes late at night, illumination uniformity is far below the design standards. In practice, I believe that the program can be double light fixtures, two light sources such as power or unequal power available. With this cloth lamp options, ShangBanYe two full bright light, late at night close one source. In this way, the control uniformity had no effect, unilateral arrangement, staggered, symmetrical arrangement, can use this program.
Fourth, intelligent light buck – Regulators – dimming technology,
Intelligent Light buck – Regulators – dimming technology, the device is installed in the power distribution circuit Qiduan street in before midnight for the whole loop pressure control the lights, close to midnight, the car came from a lower voltage thin people. Its saving principle there are two, one is to maintain high pressure sodium lights voltage below 198V, the light will not be extinguished; second is due midnight grid users less load is low, the grid voltage higher than 220V, and overvoltage an additional portion of energy consumption, the use of this device is to avoid this part of the waste. According to engineering practice, and its energy-saving effect in about 15%. With this device, not only saves energy, does not affect the uniformity of illumination, but also to avoid light overpressure run, extending the life of electrical light source. It should be noted that this method is a step-down power distribution circuit, within the circuit all fixtures in the low-voltage operation. As street distribution circuit supply radius up to 800 meters, with the lamp and power supply terminal distance increases, the voltage gradually decreased, if the lines are poorly designed, there may be a remote voltage source can not meet the normal maintenance of the required voltage.
Five, using variable power ballast
Variable power ballast, use gas discharge lamp in proper operating current is reduced, the principle still running through the rest of the night to increase ballast reactance, thereby reducing the source current to achieve the purpose of energy saving street lighting system as a whole. In this way because it is installed at the lamp, can be applied to a variety of lamps and lamp combination arrangement. The original road lighting engineering, may also have additional type variable power ballast transformation, supporting the original lamp ballasts shall not replace, convenient transformation of the construction, and reduce system cost.