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The high-voltage switch industry has experienced significant growth, driven by the emergence of AC and DC Ultra High Voltage (UHV) projects. This urgent need for technological advancement has spurred innovation across the sector, particularly in the development of high-voltage isolating switchgear. The transition from ultra-high voltage to UHV has been marked by rapid progress, with the industry showing a positive trajectory. However, there remains a strong emphasis on enhancing R&D capabilities and reducing production costs to ensure long-term sustainability.
China's approach to UHV and EHV AC isolating switchgear is often seen as a model of independent innovation in power transmission equipment. The industry has made remarkable strides, significantly improving product quality and performance. Industry data reveals that by 2006, over 300 500 kV substations were equipped with 550 kV isolating switches. Since the 1960s, China has developed 363 kV and 550 kV isolators, marking a 40-year journey toward UHV technology and global leadership in power engineering.
A major milestone was the construction of the first 330 kV transmission line using domestic equipment, led by Xi'an and Shenyang High-Voltage Switchgear Factories. They successfully launched the GW7-330/1500 three-column disconnector, setting a precedent for self-reliance. Additionally, the ZH1-330 open-type combination appliance was introduced to meet specific needs at the Liujiaxia Hydropower Station, offering a compact and cost-effective solution. This unique design became a hallmark of Chinese innovation.
The breakthrough in the first generation of 550 kV isolators broke foreign technological monopolies. Prior to this, China relied heavily on imported equipment. The successful development of these systems, such as the GW6-550 scissor disconnector and GW7-550 three-column isolator, marked a turning point. Although produced in limited quantities, they laid the foundation for future advancements in 550 kV isolation technology.
Key manufacturers like Pinggao, Shengao, and Xikai have played a crucial role in advancing the industry. They have continuously improved their products, introducing new models with independent intellectual property rights. For example, Pinggao developed the GW27-550 and JW8-550, while Shengao upgraded its GW6-550 to GW6A-550. These efforts reflect a strong commitment to innovation and market responsiveness.
With the rise of UHV projects like the Three Gorges and West-East Power Transmission, the industry has gained momentum. Companies are accelerating product upgrades, enhancing competitiveness, and expanding their technical capabilities. Changsha High Voltage Switch Co., Ltd. also made notable contributions, developing advanced isolators such as GW16A-550 and GW35-363.
The 750 kV transmission project marked a new era, with Xikai and other companies producing critical components like the GW45-800 isolator. These developments paved the way for UHV technologies, opening up new opportunities for the industry. With more than 6,000 UHV isolators already in operation, the sector continues to grow.
Looking ahead, the expansion of power grid infrastructure presents vast market potential. However, challenges remain, including gaps in product quality compared to multinational competitors. To address this, the industry must focus on innovation, quality improvement, and digital manufacturing. By doing so, it can strengthen its position in the global market and ensure sustainable growth.
October 07, 2025