At present, the State Grid Corporation has initially established a three-dimensional inspection system, and helicopters, drones, inspection robots and other intelligent equipment are increasingly applied to power grid transportation inspection work. Among them, the scope of helicopter patrol operations has covered all cross-regional power grids and provincial backbone networks. UAVs are widely used in daily inspections of transmission lines. Robots in substation stations have achieved a centralized rotation of voltage levels of 110 kV and above, and tunnel inspection robots can Complete the normalization inspection task for standardized cable tunnels.
On the 15th of November, the temperature of Jinan, a spring city, plummeted and chills hit people. At 0800 hours, the “micro-house†door near the 500-kilovolt equipment area in the Quancheng 1000-kilovolt high-voltage substation was opened on time, and an embarrassing “big-eyed†robot came out slowly and began to read the meter on the equipment. "This robot can be said to have helped us very much! If we patrol manually, the entire UHV station's meter reading and temperature measurement will take at least 3 hours, and we will need to manually enter the data. Now, we don't need to take a snowmobile to visit." Sitting in the main control room will be able to see the most accurate, most comprehensive, and most timely operational data for all equipment.†According to Wang Hongwei, the stationmaster, this robot is absolutely a “model employee†at Quancheng Station.
Lu Shouguo, director of the inspection department of Shandong Electric Power Maintenance Co., Ltd., said: “After these years of transformation, we have taken the lead in achieving 100% of the reading and temperature measurement of robots. This has not only improved the accuracy and timeliness of routine work. What's more important is to free the attendants from the simple and trivial inspection work to carry out maintenance work and provide strong technical support for the 'integration of transport inspections'.
At present, the State Grid Shandong Electric Power Company has achieved full coverage of intelligent inspection robots from 110 kV to 1000 kV substations of all voltage levels. Through the deployment of intelligent power inspection robots, it has achieved "all-autonomous, high-efficiency, all-weather" inspections and accumulated more than 2,000 hidden defects in equipment.
Located in Suzhou 500 kV Mudu substation about 800 kilometers away from Quancheng station, the operation and maintenance personnel are applying another intelligent equipment to improve work efficiency.
Jia Jun, the on-site testing personnel of the Jiangsu Academy of Science and Technology, used helmet-mounted multi-spectrometers, smart 7-intelligence detectors and other smart wearable inspection equipment to complete live detection of transformers, GIS and other power transformation equipment. Jia Jun said: “In the past, we used an independent handheld device, large and heavy, at least two people to complete the above infrared temperature measurement and UV detection, detection efficiency is very low. Now, infrared thermal image and ultraviolet Imager and other devices can be assembled on a hard hat, which is small and portable, enabling intelligent defect diagnosis, eliminating the need for manual image diagnosis.
Seven-in-one smart board test equipment can not be overlooked. "This set of equipment uses wireless, modular, integrated design, a set of equipment integrates 7 commonly used live detection capabilities, including ultrasound, ultra-high frequency and other types, and sensors and the host are using a small design, can easily plug Into the inspection vest pocket." Jia Jun introduced that the current diagnostic accuracy of the UHF radio map spectrum can reach 95%, through the wireless network to upload data to the background for diagnosis, and then return to the scene takes less than 1 second time. At present, the equipment has been applied in 20 substations such as the Suzhou 500-kilovolt transformer station, which has effectively reduced operating and maintenance costs and improved work efficiency.
Line Inspection Adds New Forces
On November 13, in China, Kailu, Inner Mongolia, Zoucheng, Shandong, Jiexiu, Shanxi, Jingbian and other places, State Grid Communications Corporation is conducting inspections on the ±800 kV Lugu Line and Zhaojian Line. On the same day, a total of 21 units of the company circled between the silver towers of the tower and carried out helicopter power inspections such as line inspections and laser scanning in many places throughout the country.
The advantages of helicopter power operations that are flexible, efficient, and free from terrain constraints are conducive to significantly improving the efficiency of line inspection operations. Some line defects can also be carried on the electrified method by using helicopters to carry personnel. The cost and time cost of the line are lower than that of artificial electrification.
As a professional platform for the company’s helicopter power operation service, at present, the operating scope of the State Net Navigation Company covers the area in which the company operates. The businesses covered by the aviation inspection professional include routine air patrol, laser scanning, air patrol, special channel patrol, process inspection, and infrastructure inspection and acceptance. In many aspects, it can meet the different needs of power grid operation and maintenance. The annual operating capacity of the State Net Navigation Corporation increased from 26,000 km in 2008 to 180,000 km, organized nearly 57,000 hours of various types of flights, and conducted 655,000 kilometers of air routes, and discovered 78,000 defects, of which 3615 were serious critical defects. In 2017, the company completed the 750-kilovolt Iku line and the Qinghai-Tibet DC-Cable line through helicopter operations, successfully completing the “One Belt and One Road†International Cooperation Summit Forum, and the party’s 19 major power guarantees.
On the same day that China National Navigation Corporation’s crew carried out an inspection and acceptance inspection of the ±800 kV Lugu Line and Zhaohao Line, the inspection of Xia Liwei of Hubei Electric Power Maintenance Co., Ltd. discovered 500 kV when manipulating drones for inspections. There is a pin-level defect in Tower 90 on the Sanjiang Second Loop. The company then formulated a defect elimination plan based on the site conditions.
Ma Jianguo, Director of Inspection and Maintenance Department of Operation and Maintenance Department of Hubei Electric Power Co., Ltd., introduced that the UAV is equipped with visible light, infrared, ultraviolet and 3D laser radar, and has pin-level defect inspection and contact temperature in line operation and maintenance. High-precision detection and high-precision, high-efficiency troubleshooting of transmission line conditions. It is understood that the "full physical examination" of the 500-kilovolt power tower can only check up to five towers a day for artificial electrification, and the drones can check at least 20 towers a day.
On June 21 this year, a UAV inspection and inspection company of Hubei Province carried a UV inspection, and found that the 500 kV Gap had serious defects in the ground line at 50 meters away from the trumpet side of No. 69 left-side ground on the 69th. “This kind of defect was previously difficult to detect with the naked eye. Now it can be accurately located by drone scanning.†Ma Jianguo said that drones can use 3D modeling technology to carry out dead-end CT scans to fully inspect the defects of the line tower mast. Artificially "looking and asking" is more advanced and more efficient.
It is understood that in recent years, State Grid Hubei Electric Power Co., Ltd. has applied drones to carry out 93,3 inspections of line inspections, 11,687 kilometers of inspection lines, and has detected and dealt with 804 pin-level defects, greatly improving the quality and efficiency of power grid inspections.
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