The energy-saving analysis summary of road lighting compares the advantages and disadvantages of the whole method, the mid-night light and the installation of the power-saving device in the road lighting design. Key words road lighting energy saving energy is an important task for developing the economy and stabilizing society. There are many types of energy, but electricity is the most basic and widely used energy source. In 2004, with the rapid development of the country's economy, all parts of the country felt the tension and lack of electricity. Therefore, saving energy and ensuring sustained economic development have become a top priority for us. Road lighting is a large user of electric power. Under the premise of ensuring the function of road lighting, saving energy has a great effect on the economic development of the country. Therefore, it is necessary to discuss the energy saving of road lighting. The first step in energy conservation for road lighting is to focus on design. When determining the standard of road lighting, it is necessary to choose the illuminance value reasonably. In the urban road lighting design standard [CJJ45-91], the maximum average illuminance value specified is 20Lx. With the development of society, appropriate improvement is also possible. However, some cities currently have too high requirements, and the average illuminance value far exceeds the standard. From a certain point of view, it is good to be brighter, but we should base on the recent national strength, seek truth from facts, and do what we can. We must not blindly compare and unrealistic advances, causing unnecessary waste. Choosing energy-saving appliances in road lighting design is also an effective energy-saving measure. For example, use a light source with high luminous efficiency, use incandescent lamps and high-pressure mercury lamps with low luminous efficiency as much as possible; use high-efficiency lamps, do not use lamps with unreasonable light distribution and low light efficiency; promote the use of electronic ballasts and gradually replace them Inductive ballast; perfect reactive power compensation for single lamp, improve power factor and reduce energy loss on the line. Another important contribution to energy conservation in road lighting design is the choice of mode of operation. At present, there are two ways to use more: one is to use full and half-light operation mode, and the other is to install power-saving devices. These two methods have their own advantages and disadvantages, and are now analyzed and compared as follows. 1. Full-time, mid-night light operation mode, mid-night light operation Whether it is single-sided or double-sided arrangement, it is generally not recommended to turn off one side street light. Although this method does not require an increase in investment, it has a great influence on the quality of illumination (illuminance, uniformity). The other method is to use the interval to turn on and off. The impact of this method on the quality of lighting is relatively small, but an additional half-night light line is added, and the total investment has increased. A better method is to use a dual-source luminaire that turns off one of the illuminators in the middle of the night. This method has some effect on the contrast, but has little effect on the uniformity. It also needs to add a midnight light line, and the price of the dual-source lamps is higher, so the total investment increases. The qualitative analysis of the energy-saving operation modes of full and midnight lights is carried out above, and some comparisons are made on their economies. (Only calculated for different parts and local prices) Example: A three-phase street light line, equipped with 400W high-pressure sodium lamp 48ç›, average spacing 35m, power factor single lamp compensation to 0.8. (The distance from the power point to the first xenon lamp is 35m) 1.1 All the running currents of the night light: 1=400×1.15×48÷1.732÷380÷0.8=41.94(A) According to the calculation of current moment, we should choose 35mm2 cable. The investment of the cable is: 10.6 yuan / m × 7392m (single core cable) = 78355.2 yuan 1.2 according to the full, half of the half of each half of the operating current: 1 = 400 × 1.15 × 24 ÷ 1.732 ÷ 380 ÷ 0.8 = 20.97 (A) by current The moment calculation option shows that a 16mm2 cable should be selected. The investment of the cable is: 5.6 yuan / m × 7392m × 2 (full, midnight circuit) = 82790.4 yuan cable protection tube (adding the midnight circuit) Investment: 10.5 yuan / m × 35 × 48 = 17640 (yuan) : 400 yuan or so total investment: 82790.4 yuan +17640 yuan +400 yuan = 100830.4 yuan "all, half of the night light running" than "all for the night light operation" increase investment: 100830.4 yuan - 78355.2 yuan = 22475.2 yuan midnight light operation press From 0 o'clock to 5 o'clock in the morning, the annual electricity saving fee is: 0.432 yuan / kW × 0.4 × 1.15 × 24 ç› Ã— 5 hours × 365 days = 8703.94 yuan The investment recovery period is: 22475.2 yuan ÷ 8703.94 yuan = 2.58 (years), that is The increased cost after running the midnight light can be recovered in about two and a half years.
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