2 Abstract This paper introduces the manufacturing technology of the insulation structure coil of the 15.75kV strip stator coil jointly developed by Shuangfu Company and Fuji Electric and has been applied to the capacity expansion project of Dahua Hydropower Plant, and the test results of the test rod.
1 Overview The Dahua Hydropower Plant on the Hongshui River in Guangxi is equipped with four single-machine 100MW4MVA hydroelectric generating units. Since the four units were put into operation from December 1983 to June 1985, the stator of the turbine runner generator has exposed more defects12, which has seriously jeopardized the safe operation of the unit. Therefore, the owner decided to use the time of the year. Four units were rebuilt, and at the same time, the output of the rebuilt unit reached the bidding, and Shuangfu Company won the bid for some of the generator companies.
Unit 2, which was the first to implement the transformation, was shut down in October 1998 and was successfully rebuilt on May 26, 1999. The first modified unit was also put into operation on May 4, 2000. The first transformation of the original generator for the defects, as well as the requirements for capacity expansion, our company carried out a more comprehensive and deep calculation test and demonstration. In the design and production of the stator coils for the capacity expansion of Dahua Hydropower Plant, new structures, new materials and new processes have been adopted in recent years.
2 Generator Stator Coil Insulation Technology Since its establishment in 1994, Shuangfu Company has introduced Fuji Electric's advanced management concept technology research method, design and manufacturing technology of hydroelectric generating sets. At the same time, according to the overall quality management theory, the company has comprehensively promoted the major aspects of the quality of the people, namely, the method, the machine environment, and the raw materials. Among them, the technicians were selected to operate the workers to Fuji Electric, and the Fuji Electric dispatched instructors to the company to guide and introduce foreign countries. Advanced equipment, transform existing equipment, improve product production environment, entrust domestic manufacturers of insulating materials, develop new materials according to the technical requirements put forward by our company; and so on.
Through the above measures, the insulation of our company and the design and manufacturing technology of its related products have gradually approached and have basically reached the world advanced level.
Dahua Power Plant Capacity Expansion 15.7510 Strip Stator Coil 2.1 Larger Stator Bar Insulation System The stator coil insulation system used by our company is pre-impregnated insulation system. The heat-pressurized insulating layer is cured to form a uniform and dense insulating layer by heating and pressurizing.
22 Insulation Structure of Stator Bars Since 1993, Fuji Electric has conducted a comprehensive test analysis of the insulating materials used in the plant. Immediately after the establishment of the company, this test process was added. According to the test analysis results, we commissioned domestic insulation material manufacturers to develop new materials and improved the insulation structure of the wire rods.
2.2.1 Inter-row insulation is used in the inter-row insulation of Fuchunjiang Hydropower Equipment General Factory. The technology of multi-adhesive mica board is used to adjust the thickness and the amount of glue of the multi-adhesive mica board to improve the gelation of the rod. The flatness and the filling rate between the wire strands of the strands.
2.2.2 Transposition insulation F-type DMD is used as transposition insulation. Because the surface is fiber non-woven, it has better resin permeability, which can make good combination with winding wire and transposition conformal filler.
2.2.3 The transposition conformal filler adopts a new transposition conformal filler. Referring to the technical requirements of Fuji Electric, the insulation material manufacturers in the United Nations jointly developed a mica resin mixture board. Because the mica resin mixture plate is inside the air gap 3 of the sizing bar; at the same time, due to the adhesive of the compliant filler and the multi-gel mica plate and the main insulating glue, there is no defect of poor compatibility with the main insulation, so that the bar The insulation characteristics have reached a higher 2.2.4 main insulation thinning technology to reduce the thickness of the main insulation is a more effective way to improve the economic indicators of the unit. The motor made by most famous foreign motor manufacturing companies is much thinner than the main insulation of domestically produced motors. Therefore, our company and other large motor manufacturing companies in China have conducted research on the main insulation thinning technology to ensure stator bar technology.
The means of reducing the thickness of the main insulation while ensuring the electrical performance of the stator bars is to use a primary isostatic layer of the main insulation.
Due to the complicated structure of the wire rod strand transposition, the electric field distribution is extremely uneven. By using the internal insulating layer of the main insulation, the corner electric field distribution can be improved by increasing the corner radius of the glued rod to reduce the electric field distortion rate and improve the withstand voltage strength of the rod.
2.25 Technical requirements for main insulation materials, and comprehensive applicability testing of the supplied powder mica tape to selected material manufacturers.
2.3 The design of the large-scale stator bar is characterized by ensuring the electrical and mechanical properties of the stator bar after thinning the main insulation. In addition to using the internal insulating layer of the main insulation to improve the angular electric field distribution, the electric field distortion rate is improved. In addition to the withstand voltage strength, our company's online design and production environment and equipment manufacturing technology have also been greatly improved.
The design of the wire rod fully considers the bending performance of the winding wire and the resilience manufacturing equipment and manufacturing process.
The whole process of wire rod production is carried out in a dust-proof room with constant temperature and humidity, which eliminates the influence of bad environment on the performance of the wire rod.
The wire rod was subjected to main insulation molding on a computer-controlled fully automatic stator bar molding device introduced from Austria 13001.
Because the molding device has the following characteristics, it determines that the wire rod extruded by the mold has high stability and the compactness of the main insulation layer, and the molding of the wire rod is programmed, and a special molding process is adopted to completely exclude the remaining in the powder. The gas between the mica tapes is molded when the wire rod is molded. The pressure on the bar surface is increased by three times that of the past.
The wire rod gelation adopts a separate process of the groove portion and the end portion. That is, the straight portion is gelatinized into the rear end portion of the body, and the end portion is gelatinized. The implementation of this method makes the size of the straight portion of the bar extremely stable.
The resilience of the winding wire is also considered in the molding die end of the wire rod.
The above various improvements ensure the correctness of the molded bar geometry. The uniformity of the main insulation thickness The denseness of the main insulation ensures the manufacturing quality of the stator bars.
2.4 Electrical characteristics of large-scale stator test bars 2.4.1 Initial characteristics Initial characteristics data 1.
The initial characteristics are recommended to the domestic insulation material manufacturers by the test items of the national standard. The test results of the test items are excellent. Remarks No requirements No requirements No requirements No requirements No breakdown voltage required = 5 Boost speed, no required breakdown field Strongly calculated according to the thickness of the main insulation, the element should be smashed, 24.2 resistance to cold and heat cycle characteristics 180, N slightly urgent 00 strange claws, and then use about 120, 1 for cooling. After 100 cycles, the residual breakdown voltage is 12, let.
2.4.3 Withstand voltage life test Withstand voltage life test The number of bars n=5X2 is carried out in normal temperature oil, and is calculated based on the test data of 4.3. The life under 1 voltage is at 1081! the above.
2. The small 4 heat resistance test was carried out, in which the wire rod was continuously placed in 1000 and then the residual breakdown voltage was measured, and the result was 8 to make the mechanical properties of the 2.5 large stator test wire rod pass the bending test test rod number of the test wire rod. The elastic modulus E test is carried out on a special bending test device, and the test bar is placed on the device.
The two fulcrums on the lower side of the test bar can be vertically raised and lowered, so that the test bar produces a fixed deflection relative to the fulcrum on the upper side of the test bar, and is tested step by step, while the deflection is 8141618 2, 22 mm, at the test A 2+3 power frequency AC 4 withstand voltage test was performed on the rod, and the test was terminated when the test rod was broken.
3 Conclusion Since the establishment of Shuangfu Company, through the joint research and development with Fuji Electric, the design and manufacturing technology of stator coil has gradually approached and basically reached the world advanced level.
We should make progress to promote the development of new products such as domestic powder mica tape; improve and improve the process so that our products can fully reach the world advanced level.
Nie Qirong. Capacity expansion of turbines in Dahua Hydropower Station. Hydraulic Machinery Information Network, Proceedings of Technical Experience Exchange Conference. 2000, 9 Dahua Hydropower Station generator capacity expansion contract document.
Advances in the design and manufacturing technology of the stator coils of the hydro-generators of Chengdeming Shuangfu Company. Large motor technology, 2000, 5 received the deadline 20010321 edit Guo Shijie Shen Ziping! The water conservancy and hydropower installation industry is held at the Jinglao Tea Party I! On the eve of the National Day of the 5.2th anniversary of the founding of the People's Republic of China, the 50th anniversary of the birth of the hydroelectric generator installation industry in China, China National Water Resources and Hydropower Engineering Corporation pleaded with nearly 7 years old and old experts in the Beijing area. The installation industry is in the Beijing old gay tea party. Fu Yuanhao, deputy general manager of China National Water Resources and Hydropower Corporation first issued a high-level respect and holiday greetings to the old senior leaders of the old generation of Guo Jiantang and the 120,000 hydropower system staff who made a pioneering contribution to the installation of hydroelectric power. In the speech of the brief report on the reform and development of the water and electric installation industry, the speech reviewed the achievements and achievements of the hydropower installation in the past 5 years, and put forward specific prospects and implications for the reform and development of the hydroelectric installation industry. j. The old leader of the hydropower industry, Lin Hanxiong, Zhang Tiezhen, Shen Xinxiang, etc. attended the meeting and gave a warm speech. Everyone was deeply encouraged. The old comrades who installed the hydroelectric power in the Beijing area gathered in the hall to talk about the achievements of the past 50 years and recall the past years. We are all excited and happy, and we are grateful to the Hydropower Engineering Corporation for providing such a rare gathering to the old comrades. We wish our country's hydropower together! The construction industry continues to take off and create more glorious development prospects. !
Wang Mante
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