Combined with the longitude and latitude calculation, the switching time of 70,000 ç› LED lights illuminate Gangcheng
As the winter approaches, the time in the dark is getting earlier. Many people have reported that the street light switch time in front of the road is different, sometimes early and sometimes late, I don't know why. On the morning of the 3rd, the reporter visited the light control center of the Yanhua City Urban Management Bureau, where the automatic lighting control of the 70,000 LED street lights was carried out. According to the Beijing lighting time, the Yantai latitude and longitude was automatically adjusted. In case of special weather conditions, It can also be switched manually.
Convert lighting time according to latitude and longitude
At 9:00 on the 3rd, in the light control center near Xiaohuang Mountain in Zhifu District, more than 70,000 LED street lights in the downtown area of ​​Zhifu District and the main roads such as Binhai Road, Guanhai Road and Gangcheng Street are controlled here. turn off.
The day's switch light time is displayed on the big screen. "The light-off time for this morning is 6:04, and the light-off time for the evening is 17:01." Yuan Yongzhi, director of the Light Control Center, told the reporter. It is understood that the daily switching time is different for 365 days a year.
Then according to what to determine the daily switch light time? The original Yongzhi told reporters that under normal circumstances, Beijing will determine the daylighting time, the system will automatically determine the local lighting time according to the latitude and longitude difference calculation. From the lighting time curve of these days, the reporter saw that the daily lighting time will be 1-2 minutes earlier than the previous day, and the corresponding lighting time is 1-2 minutes later than the previous day. "The light should be at the latest on the summer solstice day. It should be lighted after 8 pm. The light should be around the winter solstice at about 4:30 pm, which is about 4 hours." The original Yong Zhi said, but if When it is rainy, there will be a certain amount of time to turn on the lights. It needs to be adjusted in real time according to the specific weather conditions. Like the rainy weather in recent days, the darkness is relatively early, and the maintenance department arranges special personnel to adjust it at the right time. Street lights ensure the convenience of the citizens. In the event of special weather, extreme weather or major events, the staff will also control the opening and closing of the street lights at any time according to actual needs.
The control center can see every street light
"At present, the city is a transformer that controls the street light switch around one kilometer. Therefore, the street lights of 40-50 miles in one kilometer can only be illuminated at the same time." Yuan Yongzhi said that Yantai will gradually introduce a single lamp control system. 540 sets have been installed on Tongshi South Road to do the pilot. From the control center, you can clearly see which lights are not lit, so as to organize maintenance. In recent years, the management department has successively replaced the street lights of the main roads such as Airport Road, Guanhai Road and Erma Road. The old lamp heads of the old-fashioned street lamps were all replaced with energy-saving and well-lit LED street lamps, which greatly improved the night lighting situation. "Take two roads as an example, it is an important section of the urban area. The street lamps are installed in 2005. The general street lamps are replaced in about 8 years. The old street lamps of Erma Road have reached the service life. The street lamps that have been in service for a long time have the disadvantages of low brightness and insufficient energy saving. The original Yongzhi 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 light is equivalent to the lighting effect of a 500 watt sodium lamp.
The reporter learned from the management office that the relevant departments will formulate led street lamp replacement plans every year, from the main secondary roads to the streets and lanes, and gradually popularize energy-saving lamps.
The cable is automatically shut down by the system.
Street lights often suffer from "black hands", some are smashed, some are damaged by cars, and there are long-term use for drying quilts. The reporter learned that the most serious damage was the theft of the cable, so the street lamp has been studying how the cable is burglared for several years.
Originally, Yongzhi introduced that the principle of cable anti-theft is that a weak electric circuit is formed at the street lamp power supply. When the system is working normally, that is, when the cable is not stolen, the circuit should generally have a current of 1 to 3a, and the street lamp monitoring system. After automatically multiplying by the multiple of the current transformer ratio, it is possible to detect tens of amps or more. Regardless of the day or night, if the main cable is cut off, the current in the loop will disappear. After the remote detection, the streetlight monitoring system will prompt the cable theft situation at the first time.
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