A few days ago, 6 new products including UHV converter variable valve side bushings and UHV DC wall bushings independently developed by China Electrical Equipment have successfully passed the national technical appraisal, and their main performance indicators have reached the international leading level.



 

The new products that have passed the appraisal mainly include the UHV converter valve side casing series: ±800 kV glue-impregnated paper capacitive converter valve side bushing, ±400 kV glue-impregnated paper capacitive converter valve Side casing, ±200 kV glue-impregnated paper capacitive converter valve side casing; UHV DC wall bushing series: ±800 kV glue-impregnated paper capacitive DC wall bushing, ±400 kV glue There are 6 items of paper-impregnated capacitive DC wall bushings and ±150 kV glue-impregnated paper capacitive DC wall bushings.

For a long time, UHV DC bushings have been restricting the localization of UHV projects in China and affecting the rapid development of my country's power industry. China XD Group, a subsidiary of China Electrical Equipment, has always been committed to improving the level of UHV equipment research and development in my country. In recent years, it has provided the world’s first ±1100 kV DC ring for the world’s highest voltage UHV transmission project—the "Changji-Guquan" project. Oxygen core SF6 gas composite insulation through-wall bushing products, "Qinghai-Henan" ±800 kV UHV DC transmission project provides China's first ±800 kV glue-impregnated paper valve side bushing and the first ±800 kV glue-impregnated Paper wall bushing, the world's first ±800 kV UHV multi-terminal flexible DC transmission Kunliulong DC project provides China's first ±800 kV flexible straight wall bushing, etc., and has mastered the R&D, production and manufacturing capabilities of the product series.

The domestically-made bushing series products for UHV DC transmission projects of China Electrical Equipment are developed and produced based on the "Qinghai-Henan" ±800 kV DC transmission project. They have reasonable product structure, advanced technology, large current carrying capacity, small partial discharge, and low temperature rise. , High mechanical strength, low dielectric loss, high yield and convenient installation and maintenance. This series of products has high technical content and is difficult to develop. The affiliated China Xidian Group uses the DC bushing optimization design platform with independent intellectual property rights, and relies on the experience gained in the high-voltage DC bushing for many years to overcome the technology, process and production one by one. , Test difficulties, formed UHV bushing large-size epoxy core solidification and constant tension rolling and other key process manufacturing technologies, established advanced ±800 kV DC engineering series converter valve side bushings and ±800 Design technology and manufacturing process specifications for DC wall bushings for kilovolt UHV DC projects.

The successful development and application of the series of bushing products for UHV DC engineering once again demonstrates China Electrical Equipment’s ability in the field of UHV DC engineering bushing product R&D, design, manufacturing and testing, and is helpful for solving the constraints of my country’s ±800 kV DC engineering The bottleneck problem of the core equipment in the development and construction, fill the gaps in the converter transformer valve side bushings and DC wall bushings in the field of UHV DC transmission projects in my country, and the technology feeds back the development of DC bushings of ±800 kV and below to improve my country's power transmission and distribution In the industrial chain, it is of great significance to promote the localization of UHV key components.

As the national team and main force of my country's power transmission and distribution industry, China Electrical Equipment has always stood at the height of serving the national strategy, based on creating original technology sources and modern industrial chain lengths, and taking scientific and technological innovation as the "number one task" of enterprise reform and development. Take the initiative to undertake more major research and development tasks related to the foundation and core competitiveness of the equipment manufacturing industry, strengthen the "stuck neck" key core technology research, promote scientific and technological self-reliance, and strive to build a world-class smart electrical equipment group.