China's UHV transformer manufacturing once again set a new world record. On June 27, the first converter transformer of Changji-Guquan ±1100 kV UHV project started from the Changji Special Transformer UHV Research Base of Xinjiang, and it took 6 days to successfully arrive at the Changji Converter Station of Zhundong Development Zone. It is reported that the project is the world's highest voltage transmission, the largest transmission capacity, the farthest transmission distance, the most advanced transmission technology, known as the pinnacle of power engineering. The pit stop of the ±1100 kV high-voltage transformer indicates that the Changji converter station will fully enter the core equipment installation phase.
Wang Jian, chief engineer of the project, said: "This ±1100 kV converter transformer is the world's first set of products, 33 meters long and 12 meters wide. It is 18.5 meters high and has a capacity of 607,500 kVA, which is 20% higher than the current world record. In recent years, China's transformer manufacturers have repeatedly developed the "first set", "maximum capacity" and "highest voltage level". The products, which set the world record again and again, highlight the "China's creation" and "China's leading" in the field of transformer manufacturing.
Ingenuity to ensure high quality equipment
It is understood that Changji-Guquan ±1100 kV UHV DC transmission project has the advantages of strong line transmission capacity, low loss, no need for synchronous operation on both sides of the AC system, and small loss to the grid when fault occurs, especially suitable for long distances. Point-to-point high power transmission. As the starting point of the UHV project, the core equipment of Changji Converter Station is the converter transformer. The safe operation of the product is the key and important guarantee for the project to achieve benefits.
In May 2016, TBEA won the bid for all 14 high-end commutations of the Changji-Guquan ±1100 kV UHV DC project Changji Station of the State Grid Corporation with its technological innovation capability and key project performance. In October 2017, the production of the project products was fully launched.
Zhang Xin, secretary of the TBEA Party Committee and Chairman, said that the first converter with a ±1100 kV DC transmission converter was successfully trial-produced at TBEA on May 26 this year, and passed all tests at one time. In the factory test, the indicators such as temperature rise and partial discharge of the converter are superior to the technical agreement and national standards, and have been fully recognized by customers.
Behind this big country, the wisdom and hard work of the special electric workers are condensed. "I have been working for 32 years, and I have built countless transformers, and the ±1100 kV UHV transformer is the first time. It is a rare experience and honor for life." In 1986, he entered the work of TBEA Shenchang Company. Qingbin said.
The lead manufacturing team led by him is the most critical process for the entire transformer production. The thousands of leads are criss-crossed, which is equivalent to the blood vessels of the human body. A slight accident will cause a major accident. Therefore, stricter tightening and fine-tuning have become the norm for his work with employees.
On the body of the device, the various types of lead wires are arranged in an orderly manner with a uniform interval. Due to the special structure of the transformer, the lead process is 100% by hand. In a small space, employees often have to squat, squat, or bend around to wrap the insulation layer on the device. The body is the largest component on the converter transformer. Its outer casing is a kind of paper insulation material, which is very fragile. Any scratching during the lifting process will lead to the decline of the insulation performance of the product or even scrap. In order to ensure the smooth completion of the converter transformer for ±1100 kV DC transmission, TBEA staff repeatedly carried out the final assembly speed-up drill on the ±800 kV converter transformer.
To this end, TBEA invested in high-quality, high-standard projects in the project planning period to build the world's largest, most advanced national UHV engineering technology research center, ± 1100 kV transformer R & D and manufacturing base.
In terms of on-site installation, according to Yao Bin, head of the ±1100 kV Changji Converter Station project, the installation of such a large amount of electrical equipment on site is unprecedented. The installation difficulty is extremely great for all technicians. challenge. The main difficulty in installation is concentrated on the installation of the valve side casing, and the entire docking process requires extremely high precision.
13 other products have entered the production chain
The successful conversion of the converter transformer at the Changjit Transformer UHV production base marked the beginning of a new era in the development of the world's UHV transmission technology. At present, the production of high-end commutation of Changji Station of ±1100 UHV DC transmission project has entered the peak period. The other 13 products have entered the production process. According to the plan, all products will be produced and tested at the end of August, and will be shipped one after another. Install on site to ensure that the project is commissioned by the end of the year.
Wang Jian said: "The products shipped this time are the world's first set of products. The product has high voltage level, large single capacity, high technical and production difficulty, tight production time and heavy tasks, and strict requirements on manufacturing environment and processing quality. The electrician turned the project into a life project."
Because the ±1100 kV UHV project is the second UHV transmission project to be implemented by the state, it is also a new milestone in the history of the world's energy. Changji Converter Station is the starting point for the second UHV transmission channel. After the project is put into operation, it can transfer 66 billion kWh of electricity to the East China region, equivalent to transporting 30.24 million tons of coal, directly creating an industrial output value of 19.8 billion yuan. It is of great significance to promote the development of Xinjiang's energy base, promote structural reforms on the supply side, stimulate economic growth, expand employment, and achieve social stability and long-term stability in Xinjiang.
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