China News Agency, Xining, May 3 (Li Jiangning and Ren Jiyun) The reporter learned from the State Grid of China (hereinafter referred to as State Grid) Qinghai Electric Power Company on the 3rd that on the 2nd, the world's largest UHV converter station - Sichuan Liangshan cloth tow exchange The first 500 kV 62 bus GIL equipment on-site oscillating lightning impulse test of the flow station was successfully completed by the State Grid Qinghai Electric Power Research Institute.
The completion of this test also marks that State Grid Qinghai Electric Power has become more stable and mature in its ability and experience in the long-distance transportation of complete sets of impulse voltage generators and on-site lightning impulse tests.
Butuo ±800kV converter station is the transmission end station for the UHVDC project from Baihetan Hydropower Station. It covers an area of 930 mu, which is about the size of 90 standard football fields.
The electricity generated by the Baihetan Hydropower Station will span more than 2,000 kilometers from here in the future, directly reaching the load centers of Jiangsu and Zhejiang provinces.
According to reports, the on-site core test equipment is a complete set of 2400 kV/240 kJ mobile impulse voltage generator independently developed by State Grid Qinghai Electric Power Research Institute. This equipment has completed several 750 kV GIS equipment in high altitude areas. On-site oscillating lightning impulse test, China's first 1000 kV GIS equipment on-site oscillating lightning impulse test was completed in Zhejiang.
The purpose of this test is to check the insulation performance of the equipment as a whole after installation, and to evaluate the accidental causes that may lead to internal failures.
The on-site lightning impulse test and the AC withstand voltage test complement each other, forming the final quality check before the equipment is put into operation.
In order to ensure the safe and smooth progress of the test, Qinghai Electric Power Research Institute conducted a simulation analysis of the test equipment configuration and the wave process under different flashover conditions. After repeated research and comparison, the most safe and suitable test equipment configuration method was selected to ensure the test. Safety of equipment and test objects.
At the same time, before the test equipment is loaded and shipped, the test equipment is assembled and no-load test is carried out, and spare parts and other required instruments and equipment are prepared to ensure on-site assembly and timely test.
"This test has a long history. The on-site weather is unpredictable, the light rain is continuous, and the air humidity is about 90%. The protection of the test equipment, the grasp of the test timing, and the emergency ability of the test personnel have all presented a lot of challenges. The successful test has accumulated very important practical experience, which has important practical significance and engineering application value," said Yang Xiaoku, head of State Grid Qinghai Electric Power Research Institute.
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