Recently, led by the State Grid Corporation of China, Pinggao Group Co., Ltd., Shandong Electric Power Hitachi High Voltage Switchgear Co., Ltd., ABB and AZZ Co., Ltd. cooperated to develop 1100 kV rigid gas-insulated power transmission line (GIL) equipment passed by Xi'an High Voltage Electrical Apparatus Research Institute. Type test. This is the first UHV GIL device successfully developed in the world. It will be applied to Sutong GIL Integrated Pipeline Project, representing the highest level of similar international equipment.
As the first project in the world to use UHV AC GIL transmission technology in important transmission passages, Sutong GIL Integrated Pipeline Project is one of the large-diameter, long-distance tunnels that cross the Yangtze River. It has a total length of 5468.5 meters, the deepest depth in China, and water pressure. The highest GIL pipeline length is 34,200 meters (single phase meters), the highest voltage level in the world, the largest transmission capacity, the longest transmission distance, the highest level of technology. 1100 kV UHV GIL complete equipment including linear unit, small angle unit, compensation unit ( Expansion joint), right-angle unit, vertical shaft unit, etc., can meet the three-dimensional corners in the tunnel.
UHV GIL technology is difficult and requires high reliability. There are no mature standards and ready-to-use equipment in the world. Equipment development adopts the joint innovation mode of production, learning and research led by the owner, company-led, organization equipment suppliers, research institutes, universities and experts. Group joint research and development. The development and supply have adopted domestic and foreign manufacturers' joint design, technology sharing, and domestic delivery modes, giving full play to the complementary advantages of domestic manufacturers' UHV GIS advanced technology and international manufacturers' experience in UHV GIL engineering. During the development process, the company The academician team of experts organized a series of in-depth discussions and examinations on the GIL design scheme, process measures, and test programs. The Xi'an Institute of High-voltage Electrical Equipment research and development upgraded the required test equipment. The Chinese Academy of Electric Power carried out full supervision of the testing process. To ensure strict test evaluation. UHV GIL type test evaluation form, project, sample and more, a total of four manufacturers using two different technical routes of a total of 5 sets of supply options, each set of plans to carry out 17 tests, Five sets of different prototypes were used simultaneously. From December 2017 onwards, they lasted more than 100 days until March 28, 2018. Became the prototype of all 25 sets of type testing, the results meet the technical specifications.
The successful passage of the UHV GIL type test marks a breakthrough in the development of Sutong GIL's comprehensive pipeline project equipment, which has laid a solid foundation for the follow-up project construction. This is also the domestic UHV power transmission technology field based on domestic Another new world-class major innovation achievement has a very important demonstration significance and provides a new solution for high-voltage, large-capacity transmission under special conditions.