Providing 'strong heart' for UHV projects. China Xidian completed the production of 8 high-end converter transformers at Guquan Converter Station.
Recently, under the joint witness of experts of State Grid Corporation and China Electric Power Research Institute Co., Ltd., Xi'an Xidian Transformer Co., Ltd. (referred to as 'Xidian West Transform'), Xidian Changzhou Transformer Co., Ltd. (referred to as 'West The electric constant change') jointly developed the 'Changji-Guquan' ±1100 kV UHV DC transmission project, the last ZZDFPZ-587100/500-825 converter transformer passed all the factory tests, and all performance indicators reached the target expected value. This represents the successful completion of the production of high-end converter transformers of 8 sets of Guquan converter stations under the control of China Xidian Group Co., Ltd. (referred to as 'China Xidian').
The successful development of the high-end converter transformer of Guquan Converter Station marks that China Xidian has taken a solid step in the development of high-end converter for ±1100 kV project, which has set a new height in the world power grid technology and opened UHV transmission. A new era of technological development.
Xidian West became the commuter change provided by the 'Changji-Guquan' ±1100 kV UHV DC transmission project.
Master the valve side ±1100 kV commutation technology
The 'Changji-Guquan' project is currently the world's highest voltage level, the largest transmission capacity, the longest transmission distance, and the most advanced technology of the 'four most' UHV transmission project. It will be the world's first voltage level of ±1100 kV. 2. HVDC transmission is an important milestone for the State Grid Corporation to continue to innovate in the field of UHV transmission.
'Changji-Guquan' ±1100 kV DC transmission line DC line length 3284 km, bipolar DC line 1 time, two 12-pulse converters per pole in series. Rated voltage ±1100 kV, DC transmission capacity 12000 MW, DC rated current is 5454 amps. The converter transformer adopts single-phase double-winding mode. The transmission system has a transmission capacity of 12 GW, which is the largest DC transmission system with higher transmission efficiency than ±800 kV.
China Xidian is mainly responsible for the production and test tasks of four high-voltage converter transformers with a DC voltage of ±825 kV and four DC voltages of ±1100 kV at Guquan Converter Station.
In view of the tight construction schedule, the difficulty of the project, and the high requirements, the West Electric Power West and the West Electric Changchang two brother companies will fight side by side, from design to craft, from supply to production, organize the elites, and refine the technical solutions. Analyze the applicability of tooling equipment and rationally allocate new equipment tooling. At the same time, adopt independent and professional manufacturing technology, increase joint inspection of key nodes, always put product quality first, and achieve quality controllable and traceable throughout the whole process. , laid a good foundation for the successful completion of the product. The successful development of the product of this project marks that China Xidian has completely mastered the core design and manufacturing technology of the valve side ±1100 kV high-end converter transformer, which proves and enhances the XD brand again. Leading and leading position in the field of power transmission and transformation equipment manufacturing.
Excellence and casting of UHV boutique transformers
Due to the special structure and complexity of the UHV converter transformer, the key technical requirements are high, and the manufacturing environment and processing quality are extremely strict. The coil is the heart of the transformer, the iron core is the magnetic circuit of the transformer, and the converter transformer is composed of two mesh sides. Two valve sides, two voltage regulators, coils and insulation parts must be treated by oiling, from coil winding to high frequency welding of coils, press fitting, assembly, lamination from iron core, overall set , lead to the body installation, basically manual operation, any small mistakes in production will bring irreparable damage to the product, each link is a severe test.
In order to avoid the collapse of the coil when the wire is pressed, the West Electric West change technicians made a judgment in advance, carefully analyzed, decomposed, and guided the technicians of the wire manufacturer to the production site to conduct a single wire withstand pressure test one by one. To put strict requirements on the tightness of the wound cake, and to develop a set of effective methods. In order to make the insulation parts firmly adhered, the craftsman will give technical guidance to the manufacturer's processing process on the spot, and explain the quality problems of the insulation parts. The quality of the product, thus ensuring the quality of the insulation.
In order to meet the high-end commutation production and test requirements of the 'Changji-Guquan' converter station, China Xidian specially built a new plant and test hall in the Changdian, from the aspects of personnel, capital, construction equipment, construction management, etc. Arrange the construction of the technical transformation project to ensure the production progress of the project. The test hall adopts energy-saving, reliable, efficient equipment and measuring instruments to improve efficiency, and configures the transformer digital laboratory test equipment and measurement and control system (including test data management). The measurement and control equipment has reached domestic and international first-class level.
The 'Changji-Guquan' project has a high-end commutation, which is overweight and super-long, which brings great challenges to transportation. In order to ensure the high-end commutation and reliable transportation and installation of the project, Xidian West Organize the working group to go to the Guquan station installation site, check the site, demonstrate the site environment, survey the transportation route and simulate the transportation. In the simulation process, carefully record the key data such as speed, path, etc., use the altimetry tool to check the crossing lines along the way, signboards and other hanging objects. The impact of transport vehicles.