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Electric power safety: the topic that cannot be ignored “electricity†has become one of the indispensable resources for social advancement and human life. The electric network system, which extends in all directions, continuously transmits electric power to countless households, factories, and schools. According to statistics, as of the “Twelfth Five-Year Planâ€, the scale of China's power grid has leapt to the top in the world, and the length of the transmission line of 220 kV and above transmission lines has reached 572,000 km.
For such a huge grid system, it is not easy to maintain its normal operation. Natural disasters, equipment failures, external damage, improper operation... Many factors can cause damage to the transmission lines, resulting in leakage and power failures, which can cause serious problems for people's normal working life and even personal safety. Therefore, the leakage detection of transmission lines has drawn increasing attention in recent years.
At present, China's high-voltage circuit inspections mainly include infrared imaging detection, ultrasonic corona detection, and artificial visual inspection. The effect of infrared imaging detection is greatly affected by sunlight, atmospheric environment, etc. Usually it can only be performed at night, and only the parts with severe damage can be detected; the detection error of ultrasonic detection is large, and the detection distance is also relatively limited; and The corona discharge has a small target and weak intensity, and it is difficult to observe with human eyesight in many cases.
Is there a technology that can make up for the deficiencies of the existing technology and accurately and timely detect the leakage phenomenon and eliminate the danger in the bud?
The answer is yes, this is the UV imaging detection technology.
Ultraviolet imaging technology: In the process of preventing the electrical discharge of high-voltage equipment, the electrons in the air continuously acquire and release energy. When the electrons release energy, they will generate corona and release ultraviolet rays. Ultraviolet imaging detection technology is to use this principle, receive ultraviolet signals generated when the device discharge, you can find the fault in time.
Compared with infrared detection, ultraviolet imaging technology has high sensitivity to discharge, high resolution, and strong anti-interference ability. Therefore, it has been widely used in foreign power industry in recent years, and UV inspection methods for on-board or helicopter-borne inspections have emerged. However, our country is still in its infancy, with only hand-held UV equipment.
As a high-tech leader, China Aerospace Science and Industry Corporation has set its sights on this promising and challenging field. Recently, it launched a UV imaging leak detector.
In the 207th Institute of China Aerospace Science and Industry Second Institute, the reporter saw that the device is a full-body black box-shaped machine, similar in size to an Oxford English Dictionary, weighs about 3 pounds, and adults can easily lift one hand. . The most eye-catching are two lenses with a diameter of about 5 cm in front of the fuselage, one purple and one black, one responsible for sensing ultraviolet light, and one for observing visible light. Ultraviolet images can accurately display the corona and discharge conditions of the target. The visible light image can restore the background information around the measured target. The two-spectrum fusion image generated by the combination of the two can clearly indicate the target leakage position on an image.
“There are two difficulties in the development of the UV imaging leakage detector. The first is the engineering of the product, that is, the combination of UV imaging technology with visible light, image processing, and intelligent control technologies can form a mature product. The second is to miniaturize. Lightweight, to meet the increasingly mobile and flexible testing needs.†Song Yajun, the person in charge of the product introduced. With the accumulation of technology in the aerospace and optoelectronics fields of 207, these problems have been solved one by one.
Drone + UV Imaging: Combining this leak detector with one powerful one has to be mentioned - it can be used on a drone platform.
In recent years, drone technology has developed rapidly. Aerial photography, search and rescue, monitoring, and even performances are inseparable from their participation.
Compared with traditional manual inspections, drones are flexible and have a wide range of inspections. They can reach buildings and trees or mountains, hills, and deserts where people can't get anywhere and are more efficient. According to calculations, in the hilly terrain, an average of only 1.5 to 2 kilometers per day can be observed on an artificial line. However, with the same line mileage, it takes only about two hours to use drones. Compared with the high cost of helicopter inspections, its benefits are also obvious - the cost is lower. Therefore, drone inspections are attracting the attention of the industry in these two years. However, because of the high technical difficulty, there are few manufacturers that can be equipped with UAVs.
The UV Imager developed by the 207 is compact and lightweight, and can be hung on the bottom of a drone without affecting its flight. Compared with the on-board equipment that weighs several tens of kilograms, it can be said to be tailor-made for drones. ". During the flight, the distance between the equipment and the line can be up to 5 meters (hand-held, helicopter equipment, the observation distance is often tens or even hundreds of meters), so that its role can be maximized.
After the successful development of the ultraviolet imaging leakage detector, several indoor and outdoor test tests have been conducted at test sites such as the Institute of High Voltage in China Electric Power Research Institute and Tsinghua University, and they have performed well in high and low temperature, vibration, and reliability related tests, and have finally been introduced to the market. . And in March, the product got its first order, with a total amount of 10 million yuan. I believe that in the near future, they will be able to see their busy presence in the power system.
(Original title: UAV + UV Leakage Detector: High Voltage Line "Guardian")
[Chinese instrument network instrument research and development] A octopus-like drone suspended in the air, along the direction of the extension of the high voltage wire. At this point, on the screen of the terminal, the wires, insulators, bolts, and other components are clearly displayed on a gray background. In the central position of the line, a cluster of bright white dots shines like a nebula. This group of light is the corona emitted after the breakage of the high-voltage line. It is difficult for the human eye to detect. If it is not handled in time, it may evolve into a serious safety accident. This equipment, which can “see†the leakage of electricity, is an ultraviolet imaging leak detector developed by the 207 Institute of the Second Institute of China Aerospace Science and Industry Corporation.