Combine the latitude and longitude to calculate the switch time and 70 thousand LED lights to light the port city.

As winter approached, the time became dark. Many people reflect that the switch time of street lights in front of the road is different. Sometimes it is late and sometimes late. I don't know why. On the morning of (3) morning, the reporter visited the lamp control center of the City Management Bureau. The opening and closing of the 70 thousand LED lights were controlled by computer automatically. According to the time of Beijing lighting and automatic adjustment of the longitude and latitude of Yantai, in case of special weather conditions, it can also switch manually.

Conversion of lighting time according to latitude and longitude

Yesterday (3) at 9 o'clock in the morning, at the light control center near Mount Huangshan in Zhifu District, more than 70 thousand LED street lamps in Zhifu district and the main roads of Binhai Road, Guan Hai Road, and Hong Kong Main Street were all controlled and opened here.

The large screen displays the time of the switch lights on that day. "This morning's turn off time is 6:04, and the evening turn out time is 17:01." Yuan Yongzhi, director of lamp control center, told reporters. It is understood that 365 days a year, the switch time is different every day.

So what is the basis for determining the daily switch on time? Yuan Yongzhi told reporters that under normal circumstances, Beijing will determine the day's lighting time, the system will be calculated according to latitude and longitude difference, automatically determine the local lighting time. From the light time curve of the past few days, the reporter saw that the lighting time would be 1-2 minutes earlier than the previous day, and the corresponding turn off time was 1-2 minutes later than the previous day. "The lighting should be the summer solstice at the latest. It must be lit after 8 p.m., and the lights should be around the winter solstice at least around 4 pm." Original Yong Zhi said, but if there is a certain amount of deviation when the lights are on rainy days, it is necessary to make real-time adjustment according to the specific weather conditions, such as the rainy days in recent days and the relative early days of the darkness. The maintenance department arranges timely adjustment of the personnel, and opens the street lights early according to the situation, so as to ensure the convenience of the public. When encountering special weather, extreme weather or major activities, the staff will also control the opening and closing of street lamps at any time according to actual needs.

The control center can see every street lamp.

"At present, our city is a street lamp switch controlled by a transformer around one kilometer, so a street lamp with 40 to 50 lights in one kilometer can only be lit at the same time and shut at the same time." Yuan Yong said that in the future, Yantai will gradually introduce a single lamp control system. At present, 540 sets of pilot sets have been installed in Tong Shi Nan Road to make a pilot project. From the control center, we can clearly see which lights are not bright enough to organize maintenance. In recent years, the maintenance department has gradually changed the street lights of the main roads such as airport road, Sea View Road and two roads. The old lamp heads of the old street lamps are all replaced by LED street lamps with energy saving and good lighting effect, which greatly improves the lighting situation at night. "Take the two road as an example, it is an important section of the urban area, and the street lamp is installed in 2005. The general street lamps are replaced by about 8 years, and the old street lamps of two roads have reached their useful life. The street lamps with extended service have the disadvantages of little brightness and energy saving. Yuan Yong Zhi said that the new LED light source has the advantages of high luminous efficiency, low energy consumption, long service life and good color rendering. The 150 Watt LED street lamp is equivalent to the 500 Watt sodium lamp's lighting effect.

Reporters learned from the maintenance management department, the relevant departments will develop LED street lamp replacement plan every year, from primary and secondary roads to streets and lanes, and gradually popularize energy-saving lamps.

Automatic alarm of cable cutting system

Street lamps often suffer from "black hands", which are smashed by people, crashed by cars, and damaged by quilts for a long time. Reporters learned that the most serious loss is the theft of cables. Therefore, street lamps have been studying how to prevent theft of cables in recent years.

Yuan Yongzhi introduced that the principle of the cable anti-theft is that a weak current loop is formed at the power supply of the street lamp. When the system works normally, that is, the cable is not stolen, the circuit should have 1 to 3A current under normal circumstances. After the magnification of the current monitoring transformer's ratio is automatically detected by the street lamp monitoring system, it can be detected. Tens of ANN or even larger currents. No matter during the day or at night, if the main cable is cut off, the current of the loop will disappear. After the remote detection, the cable theft system will be prompted by the street lamp monitoring system at the first time.

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