Recently, owned by Chinese XD XD casing independent development and production, for Xiluodu and Western Zhejiang UHV DC transmission project two± 400kV/5515A resin impregnated paper converting sleeve has one-time pass the test, the indicators meet the national standards and technical requirements, the smooth delivery of the user. This marks the first domestic,with independent intellectual property rights of ± 400kV resin impregnated paper transformer bushing in the Chinese from birth.

In recent years, with the rapid rise of China's equipment manufacturing industry in the manufacturing field, transmission and distribution, most of the key equipment of DC transmission has been achieved domestically in succession. However, the development of high voltage DC bushing stillbecome a bottleneck restricting the development of the domestic power transmission manufacturing enterprises. Especially with the national 1100kV UHVDC transmission project startup, high voltage DC bushing domestic development has been crunch time. As the power transmission industry leading enterprises, the casing has always been to revitalize the nationalequipment manufacturing industry as its mission, is committed to dry AC, DC bushing core technology independent development.

± 400kV resin impregnated paper converting sleeve has the advantages offree maintenance, no pollution, light weight, convenient use etc.. ± 400kV DC products which is the first DC casing running, have milepost sense.

± 400kV DC high voltage casing as an important component of converter transformer and the valve hall, have a tremendous challenge and innovation intechnology, process, testing etc.. The rated current of Western Zhejiang UHV DC transmission project requirements of high, big current, product ofinsulation level, manufacturing process, sealing requirements, mechanical strength, load flow heating has very high demand. The casing after receiving the order, the contract as a key contract, the establishment of the projectteam, team members to participate in the implementation of the project design review meeting, held a special meeting and project design, production,research.

± 400kV high voltage DC bushing successfully to fill the domestic blank,reached the international advanced level, to enhance the level of manufacturing power equipment manufacturing enterprises in our country andabroad and the competition ability of the product, to break the foreign monopoly, have important sense for UHV DC bushing localization.