1 The necessity of implementing midnight lights With the rapid development of urban road lighting, street lamps have long-term electricity costs and become an important part of municipal spending in each city. At the same time, in order to implement the national green lighting plan, it is necessary to adopt midnight light measures to save energy and reduce electricity expenses.
The sixth chapter can clearly require the measures, the city's main road lighting should implement midnight light measures to save energy. The International Commission on Illumination CIE has also clearly stated and implemented a large number of relevant publications on road lighting as well as in Japan, the former Susie and many European countries.
2 The road lighting required by China and CIE is required. The average illuminance of the main roads in the city is between 10~30k. The specific illuminance is determined according to the size and importance of the road traffic, and the main illuminance is determined. The parameter is the flow of the motor vehicle, the higher the value, the higher the corresponding illumination requirement. When midnight, the flow of motor vehicles drops sharply and the level of illumination should be reduced to the corresponding level. Secondary roads Because of the mixed traffic of various vehicles, the speed of motor vehicles is not high, so the illumination requirements are not high. The main purpose of lighting is to prevent crime. At the same time, the street lamp power of the main roads often accounts for more than 70% of the total street lamp load. It can be seen that the implementation goal of the midnight light is the large and medium-sized roads with high illumination.
3 Implementation There are many ways to realize the midnight light, and the methods vary greatly. Some methods are highly targeted and have limited limitations, while others have a wider range of adaptability. Below, the author only introduces the midnight light of the low-voltage three-phase power supply street lamp system.
We believe here that each base lamp is only connected to one phase power supply, and the base lights on the line are connected to three-phase power.
3.1 Turn off one side street light This is the easiest and most convenient way to use it. It does not need any investment. It only needs to control the AC contactor of the corresponding circuit through the time controller or the installed street light three remote system. You can turn off the power. However, this method only works well for roads that are not too wide and adopts staggered lighting. For wide roads, the illumination on the side of the lights is too low, and the longitudinal uniformity of the central fast lane is seriously deteriorated, which affects driving. For the three roads, the sidelights on the side of the lights are lower, which affects the safety of pedestrians.
3.2 Turn off part of the street light For the shortcomings of the first method, another alternative method can be used to turn off each side of the street light to ensure that the uniformity is not reduced too much. The specific method is as follows: the opposite arrangement of the street lamp to turn off part of the phase of the power supply in the distribution box using the contactor to control different phases, see, one side lamp off phase C, the other side lamp off A, B phase, which is reduced by half The load, while maintaining considerable uniformity, although the three phases of each line are unbalanced, the total three-phase load remains balanced. The main disadvantage of this method is that the voltage drop of the line is too large due to the single-phase power supply of the C-phase of one side lamp. In the case of a large power supply distance, the three-phase power supply can work normally, and the single-phase power supply may not be able to normally light up, because the voltage is low, and the life of the light source is affected at the same time. See the arrangement of the midnight lights.
First: Yao Kai (1972-), male, Wuhan, Hubei, engineer, graduated from Zhengzhou Institute of Technology in 1994, mainly engaged in lighting and distribution design, street lighting and monitoring work.
(2) Two cable lines are laid on each side. Each side of the lamp can be connected to two lines in turn. When one line is closed at midnight, the street lamp changes from symmetrical cloth to staggered cloth, and the illumination and uniformity are both Evenly reduced, but the zebra phenomenon is less, the effect is more ideal, and the arrangement of the midnight light is seen.
The three routes can be installed with the two-arm street light, and the above wiring can be used. The fast lane side street light and the slow lane side street light can be connected to two lines respectively. When the slow lane side street light is turned off at midnight, the fast lane side remains unchanged and slow. On the lane side, only the residual light of the express road light is used, and the illumination is greatly reduced, but the uniformity does not change much. The former wiring is suitable for urban roads, and the latter wiring is suitable for exit roads near the suburbs.
Because there are a lot of motor vehicles in the midnight city, and it is still necessary to take into account pedestrian safety, but there are generally no pedestrians on the roads entering and leaving the city, and there are still relatively many motor vehicles, and the speed is high, and it is necessary to maintain high illumination and uniformity.
Another method is to use dual-source streetlights on wide roads and turn off the lights below at midnight. This way, the investment in the luminaire is higher, but the effect of normal lighting and midnight light illumination is very good. If the accessory for the regular lighting of the street light can be developed, the investment of the second cable can be saved.
Adding a line will increase the investment accordingly, but since the two lines are laid in the same trench, the labor cost will not increase much. At the same time, the load of each line will be reduced, the cable diameter can be reduced by one level, and the investment growth can still be saved within one year. The electricity bill is recovered.
3.3 Adopting new energy-saving ballasts In recent years, some regions have begun to adopt high-pressure sodium lamp ballasts that can perform power conversion to save energy. The ballast is a time prefabricated energy-saving magnetic ballast, which is usually in the rated power state, but the ballast automatically changes when the vehicle is scarce at midnight, so that the lamp can run at 60% of the rated power, achieving energy saving. purpose. This type of ballast was first produced by GE in the United States, but it is expensive.
In recent years, under the guidance of the National Green Lighting Office, it was first successfully developed and put into mass production by the Institute of Electric Light Sources of Fudan University, and the number of manufacturers has gradually increased. The product switches the ballast power by electronic control or power switch, which reduces the input power by 40% without reducing the life of the lamp, and the output luminous flux of the lamp is only reduced by 30%, and the product performance can be improved and the price is low. The investment can be recovered. Since the light source and ballast are operated at full load, their effective life is also improved. See Table 1. Table 1 Time Prefabricated Energy-Saving Inductive Ballast Performance Lamp Rating Power (W) Normal Operation Power Consumption (W) System power consumption after power reduction (W) Power saving (W) 4 Street lamp energy-saving voltage regulator This is a new type of lighting power-saving and control device, which enables the street lamp to achieve soft start, and can be realized at midnight. The centralized deceleration and energy saving function of the street lamp. After midnight, the normal user's power consumption decreases, causing the voltage to rise. At this time, the vehicle on the road is scarce, but the street lamp has increased energy consumption due to the voltage increase, and the lamp life is reduced. The street lamp intelligent power-saving dimming system solves these problems well. It can save about 40% at midnight, while the illumination is only reduced by 30%. The lamp life is extended by 1.4 times due to the voltage drop. The device has uniform light reduction and can have functions such as intelligent switch light and soft start. At present, the street lamp control device has three kinds of voltage regulation and decompression mechanisms, which are multi-tap transformers, thyristors and autotransformers. Among them, the multi-tap transformer type has the best performance, but the price is high; the thyristor type is low in price but unstable in performance, and the autotransformer type is somewhere in between. The performance comparison is shown in Table 2. (turning to page 21) and the reported value is 80.7lm/W; the nominal value of the foreign three-color powder 36WT8 lamp and 54WT5 lamp (high-power type) 100h light effect is 93lm/W. The current light-effect value of our current T6 sample lamp is 23.25% higher than the national standard T8 lamp index, which is 21.42% higher than the average level of the domestic halogen powder T8 tube. This shows that the lamp has reached the domestic advanced level.
The light decay of 000h is 14.58%, that is, the luminous flux maintenance rate is 85.42%, which is slightly lower than the luminous flux maintenance index of the T8 lamp specified in GB/T106822002. 87% is known from Table 4. Now the 100h average light decay of our T636W lamp has been 4.84% of the original life test tube dropped below 2.22%, and the 2000h light decay of the lamp made by the lamp is expected to be less than 13%. However, according to the nominal value of 1800lm of the 75% luminous flux of the 36WT8 lamp at 75% of the national standard rated at 5 600h, it is only equivalent to the 61.02% luminous flux of the T6 lamp of the company, combined with the switch life of Table 2, in the absence of Under the premise of the luminous flux index of the 36WT8 lamp with the effective life of the national standard, the effective life of the T6 lamp of the company can exceed 12000h. In short, the T6 high-efficiency energy-saving tubular fluorescent lamp developed by the company is a new type of light source product, its most The good process plan needs to be continuously improved in production practice. In addition to some of the technical research applications described above, the selection of electronic powder materials, the quality control of dip coating, the ratio control of various materials of phosphor paste, the quality control of coatings, the temperature of the baking tubes, the heating rate, the highest Process quality control of temperature holding time, hot air blowing, hot air blowing, etc.; electric heating decomposition of exhaust gas, activation specification, optimal air ratio of different power T6 lamps and total air volume control, amalgam The application of technology, the new key processes, key elements and key materials for the selection and design of materials for the G13 lamp cap of the 0-diameter of the middle shirt have been discussed in depth, especially in the lamp tube and the domestic general 20 ~40W electronic / magnetic ballast, a lot of verification work on the adaptability of the starter.
We have reason to believe that with the narrowing of the gap between the quality of domestic high-quality tri-color powder and international high-quality powder, or the adoption of international high-quality tri-color toner, and the further improvement of the fixture equipment and production process of the lamp, the company's T6 lamp The performance can be further improved, and the raw material cost is reduced by about 25% due to the small diameter of the pipe. The excellent performance/price ratio is the new energy-saving light of the world's straight tubular fluorescent lamps (continued on page 13). Street lamp power-saving equipment performance comparison static multi-tap transformer thyristor type autotransformer type output sine wave irregular square wave sine wave harmonic distortion no very serious no voltage regulation, decompression accuracy no index external circuit voltage is low 5% volts with the mains power loss regulator effect 5% voltage efficiency no index buck output on the electrical influence does not affect the lighting quality affects the lighting quality does not affect the lighting quality state transition soft start. Soft switching has inter-peak soft switching response speed, load adaptability, capacitive, inductive, resistive resistive capacitive, inductive, resistive, two-phase equipment, independent phase adjustment control, independent independent phase adjustment control, the above several street lamp power saving devices It can effectively save electricity. Although the investment has increased, it can recover the investment within one or two years.
4 Summary According to the description of this paper, according to different road conditions, the selection of suitable way to realize the midnight light can greatly reduce the energy consumption, achieve good economic benefits, and at the same time achieve a satisfactory lighting effect.
Indoor Full Color Led Display P6 Rental, which made from die cast cabinet, it is easy maintenance. Indoor Rental Led Display using the distribution and modular design to improve the stability of the Led Screen control system. P6 Led Display widely used in Indoor Rental Projects, like Party, Conference, Concert, Stage Play etc.
P6 the tried and tested 3535 packageing technogoloy, pixel 27777 per square meter, large lighting angle, uniform heat dissipation, large angle, colorful and vivid. Using the distribution and modular design to improve the stablility of the system. Each of the light-emitting points are red, green, blue, which display body with computer as control center, with perfect program production software and playing software, electronic display screen and display window to form one.
1)Salty spray test, high voltage test, varying temperature test, waterproof test, vibration test.
2)Long service time and low attenuation by applying dual channels for heat dissipation.
3)High protection grade of IP65 achieved by patented mask design with waterproof and dustproof fuction.
Looking forward your long term cooperation!
P6 Rental Indoor,Indoor Led Screen,Led Screen Price,P6 Indoor Rental Led Screen
Shenzhen Jongsun Electronic Technology Co., Ltd. , https://www.jongsunled.com