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.
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 meet the special needs of the Liujiaxia Hydropower Station for the size and space of the equipment, the ZH1-330 open-type combination electric appliance was also created, which made the power station layout compact and cost-effective. 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.
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