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The starting point is high and the two are the first
The industry generally believes that the development route of China's ultra-high voltage and ultra-high voltage AC isolating switchgear can be called the epitome of independent innovation and development of power transmission and transformation equipment, and vigorously improve the product quality level.
The latest industry statistics show that by the end of 2006, the domestic 550 kV isolation switch has been equipped with more than 300 500 kV substations. Since the 1960s and the end of the 1970s, the domestically produced 363 kV and 550 kV ultra-high voltage isolating switches have been developed. After 40 years of innovation and development, they have successfully entered the UHV period and are marching towards the peak of the world's power technology.
The first 330 kV transmission line uses domestic equipment. In order to solve the power transmission problem of Liujiaxia large-scale hydropower station, Xi'an High-voltage Switchgear Factory and Shenyang High-voltage Switchgear Factory undertook the development task of China's first 330 kV transmission line switchgear, and successfully launched the domestically produced GW7-330/1500 three-column disconnector for the first time. . Although this grade of transmission line was built for the first time, it all used domestic equipment and achieved success.
At the same time, in order to adapt to the special needs of Liujiaxia Hydropower Station for small equipment and small area, it also pioneered the ZH1-330 open-type combination electric appliance, which makes the power station layout compact and saves cost. It is worth mentioning that this type of structure is unique in the world and has become a new breed with unique Chinese characteristics.
The first generation of domestic 550 kV isolation switch broke through the monopoly of foreign technology. For a long time, the production of high-voltage switchgear in China can only rely on imports, and the development of the first-generation domestic 550 kV isolation switch broke the monopoly of foreign technology and achieved new technological breakthroughs.
The data shows that in the first 500 kV transmission line built in China--Jinliao test line, Shengao successfully developed GW6-550 scissor disconnector and JW2-550 earthing switch, and Xikai successfully developed GW7-550. Type three-column isolating switch. Although the number of these products is very small, only 20 sets, but it is of great significance, creating a precedent for independent design of 550 kV isolation switchgear.
The development of this product is based on independent innovation, and overcomes many technical problems such as aluminum alloy conductor design and manufacture, insulation test, radio interference test and opening and closing small capacitor current test, which has accumulated valuable experience for the future development of the industry.
Fast progress "three high" enterprises have unique technological advantages
The construction of the ultra-high voltage direct current transmission project, such as the Three Gorges Project and the West-East Power Transmission, has effectively promoted the development of power transmission and transformation equipment and has created a good situation. In order to further enhance market competitiveness, key enterprises in the industry have further accelerated product upgrades and continuously introduced new results.
On the basis of consolidating the market share of GW16/17-550, Pinggao developed the GW27-550 type isolating switch and JW8-550 type earthing switch with independent intellectual property rights, and developed GW28-550 with reference to foreign advanced structure. , GW29-550 new products. Shengao improved GW6-550 to GW6A-550, retaining the characteristics of double conductive knives and contact clamps, further optimizing the mechanical transmission system, improving reliability and corrosion resistance; improving GW12-550 For GW12A-550, GW6A and GW12A products have independent intellectual property rights.
Since one period, three manufacturers, Shengao, Xikai and Pinggao, have been committed to the research and development and improvement of new products, and have better met the market demand.
At the same time, Changsha High Voltage Switch Co., Ltd. increased its independent innovation. In 2002, it successfully completed the development of GW16A-550, GW17A-550 type isolating switch and JW5A-550, JW6A-550 type earthing switch. In 2003, it successfully developed GW35-363. , Model 550 and GW36-363, 550 type isolating switch, step into the ranks of manufacturers with technical advantages of ultra-high voltage isolating switches.
The new starting point spans from ultra-high pressure to ultra-high pressure
After years of development, the economic benefits of the high-voltage switch industry have been comprehensively improved, and the pace of technological upgrading has been significantly accelerated. In recent years, the commencement of the 750 kV transmission project in the northwest has opened the prelude to the construction of UHV transmission and transformation projects, and has also spawned new technologies for UHV isolation switches in China.
The 750 kV project is currently the highest operating voltage transmission line in China and the highest altitude transmission project in the world. Xikai products are first assembled and fill the domestic gap. The GW45-800 isolating switch produced by the company in cooperation with the US SSL company was officially put into operation in September 2005 in China's first 750 kV Qinghai Guanting to Gansu Lanzhou East Transmission Demonstration Project. The GW27-800 type isolating switch and the JW8-800 type earthing switch independently developed by Pinggao, the GW12A-800 type isolating switch and the JW4-800 type earthing switch introduced by Shengao also passed the technical appraisal in September 2006.
The construction of large-scale ultra-high voltage and ultra-high voltage transmission lines provides an excellent development opportunity for the power transmission and transformation equipment industry. According to industry statistics, from 1990 to 2006, the cumulative production of 550 kV isolating switch and grounding switch 5243, 363 kV isolating switch and grounding switch 1954 group, all have good performance in the market.
What is certain is that the start of the Jindongnan-Nanyang-Jingmen million-volt AC transmission demonstration project provides a rare market opportunity for manufacturers with technical reserves.
Four switch manufacturers, such as Xikai, which has a market vision, seized the opportunity to develop new products of 1000 kV UHV isolation switch independently in the shortest time, using the successful experience of developing 800 kV products, highlighting the strong technical strength of the company. .
The GWâ–¡-1100 three-column horizontal opening knives flip-type isolating switch independently developed by Xikai can be passed through the technical appraisal with the folding grounding switch attached to both sides.
The GW27-1100 three-column horizontal opening knife-turning isolating switch independently developed by Pinggao can be equipped with a vertical grounding switch on both sides, which has passed short-time withstand current, peak withstand current and open and close busbar switching current. Key items such as capacitor inductance and small current are tested.
The GW12A-1100 double-column folding open-type isolating switch independently developed by Shengao, the folding grounding switch attached to both sides, and the long-high 1000kV UHV grounding switch have passed the type test.
These results have become the first choice for the electrification test of the State Grid Corporation's UHV AC test base.
According to relevant information, at present, more than 6,000 sets of domestic ultra-high voltage isolating switches have been operated in the national power system. The longest time has been 20 years. The 800 kV UHV isolating switch has been operating safely for nearly two years, and the overall situation is good.
In the next few years, the vigorous development of power grid construction has opened up a broad market for the high-voltage switch industry and provided reasons for optimistic development. At the same time, the construction of ultra-high voltage direct current transmission project will drive and promote the research of UHV DC transmission technology, opening up a new technical field and a new market.
In an environment where the development of the industry is very favorable, pressures and challenges should also be seen.
One of the main problems affecting the development of the industry at present is that the product level and the multinational companies still have a certain gap, which is reflected in appearance, reliability, stability, durability, corrosion resistance and maintenance-free, as well as the quality of key raw materials.
In the coming period, increasing technological innovation and upgrading product levels are still the focus of industry work, while focusing on three tasks:
First, aiming at international cutting-edge technology, relying on market demand, relying on national key projects, making full use of the better resources and capital conditions of key enterprises, continuously improving independent innovation capabilities and moving toward higher goals.
The second is to widely apply new equipment, new technologies, new processes, adhere to the work of quality, quality and efficiency of the work guidelines, the application of circuit breaker design and quality management concepts to the development of isolation switch products.
The third is to promote the application of digital manufacturing technology, further improve research and development capabilities, reduce product costs, and enhance product market competitiveness.
Development of high-voltage AC isolating switchgear
Recently, the AC and DC UHV projects have started, and the urgent situation of “market forced technology†has further promoted many new technologies in the high-voltage switch industry. The development of high-voltage AC isolating switchgear has been significantly accelerated, and the leap from ultra-high pressure to ultra-high voltage has been realized. The overall situation of industry development is getting better, but further improving research and development capabilities and reducing product costs are still worthy of attention in the industry.