How to replace traditional street lamps with LED street lamps?

With the wide application of high-power LED in lighting decoration and lighting, power LED driving becomes more and more important. It will be possible to use high-power LED for road lighting. Road lighting is the lamp with the longest use time and the largest power consumption. Using LED lights in street lamps will greatly alleviate the shortage of electricity and energy in cities and save national energy.

Because street lamps are inserted horizontally, LED manufacturing can only be made to emit light on one side, but only the position needs to be adjusted when installing the light bulb, which will not affect the lighting effect. Street lamp power is divided into 20W, 30W, 40W and 50W, with high-power LED, long service life and maintenance-free. Because of the low power consumption, low voltage and low current of LED, the cross section of the installation cable is also reduced accordingly, which saves the installation cost.

A perfect road lighting system consists of light source, cable and power supply system.

1.comparison between led street lamp and traditional street lamp

Suppose a city has three sections of roads, the lengths of which are 3km, 5km and 10km respectively. The total number of street lamps needed in these three sections is 202, 333 and 666 respectively. Traditional street lamps are based on high-pressure sodium lamps with 250W power, and LED street lamps are based on 50W power.

The unit price of traditional street lamp is 1 1,000 yuan/lamp, and the unit price of LED street lamp is 3,000 yuan/lamp. The light source cost of traditional street lamps with three lengths is 202 * 65,438+0,000 yuan, 333 * 65,438+0,000 yuan and 666 * 6,500 yuan respectively. The light source costs of paving roads with three kinds of LED street lamps are: 202*3000=606000, 333*3000=999000, 666*2000= 1998000 respectively (as shown in table 1).

Traditional street lamp cost LED street lamp cost

3 km 202000 606000

5 km

10km 666000 1998000

Second, the cable cost comparison between LED street lamps and traditional street lamps

Let's analyze the cost of laying cables for two light sources in the three-section road. For a three-kilometer road, the load flow of the traditional street lamp trunk cable I=P/U=202*250/220=230A. A copper core cable with a cross-sectional area of 60mm2 is needed, and the unit price is 120 yuan/m, so the cable cost is120 * 3000 = the load flow of the LED street lamp trunk cable is 1=P/U=202*50/220=44A, and a cross-sectional area is needed. The load flow of the traditional street lamp trunk cable with the unit price of 12mm2 on the 5km road is I=P/U=333*250/220=377A, and a copper core cable with a cross section of 20mm2 is needed. Unit price 180 yuan/meter, cable cost 980 * 5000 = 900,000 yuan, and cable load flow of LED street lamp trunk line I = P/U = 333. The unit price is 25 yuan/piece, and the cable cost is 25 * 5000 =125,000 yuan. 10 km road, the cable flow of the traditional street lamp trunk line is I=P/U=666*250/220=680A. We need a copper core cable with a cross section of 400mm2, with a unit price of 360 yuan /m and a cable cost of 380A. Load flow of LED street lamp trunk cable I=P/U=666*50/220= 146A. We need a copper core cable with a cross section of 42mm2, with a unit price of 60 yuan/meter and a cost of 600,000 yuan. Please refer to Table 2 for comparison.

Traditional street lamp LED street lamp

3 km 360000 36000

5 km 900000 125000

10km 3600000 600000

Third, the power supply system

Traditional street lamps need a large power supply system. Large power transformers are very expensive. Moreover, the traditional lamp voltage cannot fluctuate too much, otherwise it will seriously affect the life of the lamp. The LED street lamp adopts the driving module of Sunshine Sheng Yuan Technology, and does not need a large transformer. When the voltage fluctuates, the brightness of LED street lamps remains unchanged. T220C350W 12S 12 can drive the LED of 12W. When the voltage changes from 180V to 260V, the whole driver can realize constant current driving. And that brightness of the high-power LED street lamp is ensure. In addition, the driver has many protection functions, which can improve the reliability of the whole power grid under abnormal conditions.

Fourthly, the energy-saving comparison between LED street lamps and traditional street lamps.

Let's calculate the annual electricity consumption cost of three sections of two light sources. The calculation method is to turn on the light every day for 10 hour, and each kilowatt-hour is calculated as 1 RMB. The annual power consumption of traditional street lamps on a 3km road is 202 (lamp) * 10 (hour) *365 (day) *250W= 184325000w, that is, 184325 kWh, that is, RMB 184325 kwh. Total power consumption of LED street lamps in one year. Rmb 36,865, the total annual power consumption of traditional street lamps is 333 * 250 *10 * 365 = 303,862,500 w, that is, 303863kWh, RMB 303,863, and the total annual power consumption of LED street lamps is 333 * 50 *10 * 365 = 63. The annual total power consumption of traditional street lamps on 10km road is: 666 * 250 * 365 *10 = 60772500 w, that is, 607725 kWh, 607725 RMB, and the annual total power consumption of LED street lamps is: 666 * 50 * 365 */kloc-0.

Traditional street lamp LED street lamp

3 km 184325 yuan 36865 yuan

5 kilometers, 303,863 yuan, 60,773 yuan

10 km 607725 yuan 12 1545 yuan

Verb (abbreviation of verb) Life comparison between LED street lamps and traditional street lamps

At present, the street lamp light source in circulation in the market: high-pressure sodium lamp, made in China, has a short service life of less than 3000 hours due to quality and technical problems. Philips is the best imported lamp, reaching 3000-4000 hours. The life of a single LED exceeds 80,000 hours. After the cluster becomes an ultra-high power LED, its service life exceeds 60,000 hours, which is equivalent to 15 times that of the best high-pressure sodium lamp in circulation now. That is to say, the high-pressure sodium lamp is replaced 15 times or more, and the LED street lamp is replaced only once. The cost of replacing the light source is dead, and the most obvious contrast is the maintenance cost and the inconvenience it brings. Because the street lamp is difficult to replace because of its special purpose, it needs certain human and machine resources to complete the operation. )

Summary:

From the above comparison and life comparison, it can be seen that LED street lamps do not have the advantage of replacing traditional street lamps in light source cost, but in laying cost, LED street lamps can already save light source cost, and the electricity saved after use is income, as well as the advantages and disadvantages brought by their respective life. The longer the road is installed, the greater the cost will be saved (the above does not include the cost of lampposts, installation and maintenance, but in fact the cost of installing led street lamps is much lower than that of installing traditional street lamps).