TRANSMISSION & DISTRIBUTION TECHNOLOGY
conditions and structural hurdles necessitated accommodating large angles and elevation variances in the design. Te Stäubli engineers faced two major difficulties. Firstly, the tolerance range of the spiral spring contacts did not align with the required deflection angle of +/- 5°. Additionally, the GIL design called for a sliding lifespan of several tens of thousands of cycles over several decades. Existing solutions failed to meet these rigorous specifications. By utilising the high-performance and flexible ML-CUX, the GIL design, specifically the pipe-to-pipe connection, achieved high reliability, simplified construction, and extended service life. Moreover, the GIL had to endure high humidity and temperatures ranging from -40°C to 50°C.
A SOPHISTICATED SOLUTION Te design of the 250kV GIL busbar connector posed challenges in terms of durability, reliability, and safety. To overcome these obstacles, Stäubli engineers developed a connection solution utilising the high-performance capabilities of ML-CUX. Machining and assembly
were simplified, and only one ML-CUX unit was required instead of two spiral springs. Te chosen solution involved employing an ML-CUX/62N with an approximate diameter of 100mm. Tis specific configuration offered significant advantages, including exceptional tolerance absorption, the highest power density, low contact resistance, and minimal heat generation. Ultimately, the Stäubli busbar connector outperformed its competitors and successfully passed rigorous on-site tests in China. Te Chinese customer carried out the installation work, with Stäubli Hangzhou (STHZ) providing comprehensive technical support. Established in 1997, STHZ is the first Stäubli Group production site outside the European region. Customer service is a top priority here. In one instance, after a long meeting with colleagues from the Swiss head office, the customer required technical support at the installation site. STHZ promptly analysed and discussed the problem. As a result, their technical support staff drove overnight to the installation site, nearly 300km away from Hangzhou, successfully resolving the issue on-site.
REDUCED TCO AND MORE CUSTOMER BENEFITS Te Stäubli ML-CUX offers several significant advantages, including low installation effort, stable power transmission, and a long life cycle. Another benefit is material savings: during comparative tests with competitors, the ML-CUX exhibited a temperature rise 10% lower than that of its counterparts. Tis reduction enabled material savings in the longitudinal direction. Additionally, by decreasing the groove depth, material could be conserved in the diameter. Te solution is also demand-driven: the ML-CUX accommodates the design of GIL systems by providing a generous deflection angle, meeting the demands of the market. Furthermore, it offers the following
advantages: low contact resistance and heat generation; high flexibility and compensation for large tolerances and misalignments; high performance and reliability guaranteed by full type testing; and consistent high quality ensured through 100% inspection throughout the manufacturing process. Overall, these benefits contribute
to reducing the total cost of ownership (TCO).
GIL FLAGSHIP PROJECT GIL solutions have obvious advantages such as high reliability, maintenance- free operation, long service life and comparatively low environmental impact. Te Bin Jiang GIL pipeline gallery project provided valuable lessons for future large-scale projects. Te Chinese customer recognised the impressive performance of Stäubli’s ML-CUX. Te successful collaboration with partners in China establishes a solid foundation for further joint applications in constructing gas-insulated pipelines. Stäubli is already involved in the Chongquing 250kV Chenbao line GIL project. Te Bin Jiang GIL pipeline gallery
project serves as a success story for all involved parties and has become a flagship project for the Stäubli Group.
The Bin Jiang GIL pipeline project has become a flagship project for the Stäubli Group
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www.engineerlive.com
Oliver Semling is with Stäubli Electrical Connectors.
www.staubli.com
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