Now start the 1200 kV GIS (high-voltage combinational electrical appliance) assembled-type insulation test platform and start the test!†May 25, Xuancheng, Anhui Province ± 1100 kV Guquan Converter Station, State Assessment Center of Hubei Electric Power Research Institute The director Chen Xi gave a command, and saw only a test platform with the appearance of a "missile launch vehicle" slowly extending. A strong test voltage was applied to the GIS equipment. The AC voltage withstand test and partial discharge test were successfully performed on site. The test was successful. success.
In recent years, the State Grid Corporation of China has continued to innovate in UHV transmission technologies, and the ±1100 kV DC transmission is in a leading position in the world. State Grid Hubei Electric Power Company exerts its technical advantages in field tests. The independently developed 1200 kV GIS insulation test platform will effectively promote the innovative development of electric power test technology.
Field trials are complicated
Traditional methods need to be changed
The ±1100 kV Changji-Guquan UHVDC project has a total length of approximately 3,324 kilometers. It is the UHV power transmission project with the highest voltage class, the largest transmission capacity, the longest transmission distance and the most advanced technology level in the world. Its voltage rating is from The ±800 kV rises to ±1100 kV, the transmission capacity has increased from 6.4 million kilowatts to 12 million kilowatts, the economic transmission distance has been increased to 3,000 to 5,000 kilometers, and the annual transmission of electricity to East China has reached 66 billion kilowatt-hours. Hubei Institute of Electrical Science and Technology also undertakes special on-site testing of electrical equipment at two terminal converter stations.
The UHV GIS on-site insulation test is the last line of defense to ensure the safe operation of GIS equipment after installation and overhaul. The AC/DC UHV project in China has entered the phase of comprehensive construction. UHV GIS is assembled and installed on site. The insulation test on site can evaluate the insulation performance of the main circuit, check the quality of equipment manufacturing, transportation and installation, and check whether there is collision due to the equipment. Improper operation or lax control of the machinery or insulation defects.
Chen Hao introduced that in the ±1100 kV Guquan converter station GIS field test, the traditional test methods can no longer meet the actual needs of the work. The traditional bulk GIS test device has high requirements for the test site, and the reactor and voltage divider are separate tower structures. The required field test site is large, and the UHV GIS equipment is compact, and the space available for conducting field tests is small and high pressure. Near distance between live equipment and non-test equipment, air gap discharge occurs when the ambient humidity is slightly high, and the test cannot be carried out. It is also difficult to transport equipment. The traditional UHV test equipment is equipped with more than 200 parts, totaling more than 20 tons. Some parts are bulky and require four 9.6-meter trucks to transport. In addition, the on-site assembly and test equipment takes a long time. These test equipments need to use multiple cranes to assemble on the site, completing the three processes of approach building, implementation of tests, and removal and dismantlement, which takes more than 72 hours. The lengthy test preparations have been difficult to respond to the requirements of the UHV GIS on-site insulation test with tight test time and large load capacity. Therefore, how to improve the safety and work efficiency of the current UHV GIS field test has become an urgent problem to be solved in the field of UHV field test technology.
Independent Innovation R&D Platform
80% savings in time cost
In order to improve the test efficiency, Hubei Academy of Electric Power applied artificial intelligence technology and independently developed the first set of 1200 kV GIS integral type insulation test platform in China. The platform integrates key test equipment such as high-voltage reactors, high-voltage dividers, and inflated pressure equalizing rings. It uses the principle of missile launcher's mobile launch and uses a hydraulic chassis and a hydraulic lifter to turn it on and off. The realization of the device's integration and motorization. Compared with traditional test equipment, it saves 80% of the test preparation time and greatly reduces the on-site safety risks.
"GIS integrated insulation test platform" is more efficient than traditional equipment. The test platform has good maneuverability. The integration of the reactor and the voltage divider is realized on one platform, and the self-supporting lifting of the complete set of equipment is realized, which can quickly respond to the on-site test requirements. In particular, the grading ring is a key component to reduce the corona loss of the device, and is usually made of aluminum alloy material, which is bulky and difficult to transport. On the basis of many tests, Hubei Electric Power Research Institute has used a new type of material to form an inflatable pressure equalizing ring. An inflatable pressure equalizing ring can replace the original four aluminum alloy pressure equalizing rings. Through series integration and R&D and innovation, Promoted the development of UHV test technology.
“Time is the benefit. In the future emergency repairs, the economic losses that this test platform will avoid every time it is dispatched will reach 100 million yuan!†said Wu Xian, head of the site trial of Hubei Academy of Electric Power, after Changji-Guquan project was put into operation, The delivered power is nearly 200 million kWh. If the converter station needs an emergency, it must be re-insulated before it can be put into operation. It takes more than 72 hours for the traditional test equipment to enter the site to set up, conduct tests, and dismantle the field. . Now with this test platform, all test tasks can be completed within 8 hours.
It is reported that the test platform will apply for more than ten national patents. After the successful application of the Guquan converter station, it has aroused great concern in the industry and will greatly enhance the efficiency and safety assurance capabilities of China's UHV power grids.
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