Column hosted Liu Ming agricultural technology bookmark0 Zhejiang street lamp control mode exploration 1994-20 agricultural power delivery iei Jiangsu Province Hongze County Power Supply Company put all 67 employees in the county power supply management position into the performance management category, line d.netbookmark1 UPlPiPiP The performance is linked to the salary and remuneration package, effectively mobilizing the enthusiasm of the work of agricultural power management positions. (Xu Liangjun) bookmark2 People often find it difficult to see the street lights turn on during the day and night. Why is this happening? The street lights are turned on and off usually using a timed method called time control mode. Now, we analyze this time control mode. In most areas, the time of dusk and dawn is not fixed all year round, but is migrating day by day. From the winter solstice to the summer solstice, the dark time (the same brightness comparison) was postponed, and the difference was about 3 hours. From the summer solstice to the winter solstice, the darkening time was advanced day by day, and the same brightness comparison was about 3 hours. The situation at dawn is exactly the opposite, that is, the winter solstice to the summer solstice dawn time is advanced day by day, the difference is also about 3h. Therefore, if the street light is turned on every day to the same degree (that is, the brightness is equal), and the street light is turned off when the daylight reaches the same level of music, it is necessary to perform the time of turning on and off the lights every few days. Adjustment, this is difficult to do with artificial pipes. Even if the daily time of day-to-day lighting is input into the computer for regulation and control, it will be different due to different weather conditions in the daily, such as cloudy, rainy, dark and early, and it is difficult to control accurately. Therefore, the time control of the fixed-point clock can not be very accurate and scientifically control the street lamp. At present, the time control uses a quartz power time switch and a microcomputer time switch. From the perspective of these two products, the common advantage is that there is a time concept, and there are more adjustable time periods. But the common shortcoming is that the time to turn on and off the lights needs to be constantly adjusted, and they all use the battery as the power source for the clock chip. The battery is exhausted and must be replaced in time. At the same time, they all have a considerable drawback. The quartz timing switch is in the critical state of turning on and off the light. Because the pressure of the two contacts in the initial state of disconnection or contact is difficult to reach uniform, there will be a critical switch. Jumping phenomenon, which will seriously affect the life of the lamp; in addition, the contact produces sparks, which is detrimental to fire and explosion protection. For the microcomputer time switch, when the battery is used up, it is easy to lose some data, and the user cannot recover it by himself. Faces are unlikely to be 100% identical, so their electromagnetic systems must be slightly different (even with the same model, the same capacity AC contactor). Because of this difference, there is a certain difference in their action (release or pull-in) time. When the release time of the AC contactor KM2 is less than the pickup time of the AC contactor KM, that is, the main contact of km2 is first disconnected and the main contact of KM is pulled back, the fault of the unit reversal occurs; when the AC contactor KM! The release time is greater than the suction time of the AC contactor KM, that is, the main contact of the KM is first attracted and KM! After the main contact is disconnected, it will cause an accident of phase-to-phase short circuit of the burnt equipment. Therefore, in order to avoid such failures, we must carefully check the equipment before and after the test installation. Never use the manual and wiring diagram provided by the manufacturer to judge whether it can be commissioned or put into operation. Otherwise, serious accidents may occur. . We also need to note that the clock still has accumulated errors. Therefore, the time control must be "three-tone", that is, constantly adjust the time, change the battery in time, and frequently adjust the clock to avoid the phenomenon that the daylight is on and the night is off. Practice tells us that this "three-tone" for small and medium-sized cities is difficult to achieve, and for the vast rural areas, it is even more difficult. Therefore, the phenomenon that the street lights are bright during the day and the night is extinguished is not caused by poor management, but by the defects of the timing control mode itself. So, is there a more scientific streetlight control mode? Yes, that is the photosensitive control mode. The light-sensitive control mode uses a light-sensitive element to detect the brightness of the sky around the clock. When the set value is reached, the actuator is driven to turn the street light on or off. At present, photosensitive control products have ZY, ―GS multi-function street light controller and ZY, ―GS10 photosensitive controller. There are many advantages of photosensitive control mode and corresponding products: (1) no adjustment is needed all year round and different meteorological conditions; (2) no battery is required for power supply, so there is no need to update the battery; (3) no accumulation error; 4) The controller can be made into capacitive, with low no-load loss; (5) can work in the open air; (6) small in size and long in life. These advantages are not comparable to time-controlled switches. The photosensitive control mode also has the disadvantage that at night, the photosensitive element cannot be irradiated by a fixed strong light, but this can be easily overcome by simply omitting the probe or the photosensitive window away from the fixed glare. For example, there is a high-altitude street light at the south street of Yueqing City. It was originally controlled by a quartz power time switch. It is often difficult to meet the requirements by adjusting the time and replacing the battery. The local streetlight team was determined to change this situation, so the experiment used a photosensitive control mode. Due to the high horizontal illumination under the high pole light, in order to avoid the fixed strong light directly after the light is turned on, the photosensitive element is driven to turn off the light, and a 7mm photosensitive probe is installed on the side wall of the electromechanical control box under the high pole light, and then A horizontal shading sheet is mounted above the probe, so that the photosensitive control of the base rod lamp is better performed. This shows that light-sensitive control can be applied to street lights anywhere. Some people may ask whether the light-sensitive control will turn on the light during the rainy day. According to the measured results of the local daytime illumination, the horizontal illumination of the unobstructed wilderness is above 2000LX when there is sun in the sunny day, and the daytime illumination when it is light rain. It is also above 1 000LX. Even when the thunderstorm is overcast, the horizontal illumination usually has several hundred LX. It is only 30LX when it is added to the rainstorm before the sun is 1h. Because of the setting of general streetlights, the illumination is 4~ 7LX, the high pole light is set at 10~15LX, so the streetlight will not be turned on during the day, whether it is raining or clouding. To take a step back, if the day and night are as dark as the night, it is also necessary to turn on the street light, which is not possible with time control. After the above analysis, it is obvious that the selection of the photosensitive control mode in the streetlight control is superior to the time control mode. Therefore, the promotion of photosensitive control is of great significance for saving energy, saving costs, improving the lighting rate of street lamps, ensuring public security and traffic safety, and beautifying the urban and rural environment. Quilt Cover,White Quilt Cover,Twin Duvet Cover,Yellow Duvet Cover Nantong Yawen Textile CO., LTD , https://www.ntywtextile.com