Power transformation and distribution trusteeship operation service
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GIS circuit breakers are typically operated by hydraulic, pneumatic, or spring‑actuated mechanisms, while disconnect switches and earthing switches are generally driven by pneumatic, manual, electric, or electric‑spring actuators. In transmission lines, GIS serves both control and protection functions, making it one of the most critical pieces of power transmission and distribution equipment. With advantages such as compact size, minimal footprint, ease of installation and construction, immunity to external environmental conditions, safe and reliable operation, flexible configuration, simple maintenance, and long overhaul intervals, GIS has gradually replaced air‑insulated and oil‑less alternatives. It is now widely deployed in power grids at 72.5 kV and above, particularly gaining widespread adoption in hydropower substations and urban distribution substations. Moreover, GIS has become the preferred choice for ultra‑high‑voltage transmission and transformation equipment. As urban development expands in scale and pace, and in response to the needs of railway infrastructure, GIS is also finding practical applications in the medium‑voltage sector.
DSC High-Voltage Disconnect Switch
Reliable contact structure: spring‑pressed sliding contacts ensure self‑cleaning and self‑locking during closing, withstanding a 31.5 kA/3 s short‑circuit current; low and stable loop contact resistance. Double‑column, centrally interrupted, hot‑dip galvanized steel base; insulators are adjustable for leveling; standard 90° opening and closing stroke; excellent mechanical stability. Safety interlock: integrated hard‑mechanical interlock with the earthing switch, completely preventing erroneous live‑earth connections; available in male/female contact configurations for earthing. Universal mounting: compatible with rectangular and circular reinforced‑concrete poles; vertical drive shaft can be segmented to suit different installation heights; supports both electric and manual operating mechanisms. Easy maintenance: standardized disassembly and assembly procedures, accompanied by a comprehensive lubrication plan; three‑level periodic maintenance schedule; contacts and transmission components can be replaced individually. Complete protection: factory‑applied protective coating on conductive surfaces; optional anti‑condensation heating for the mechanism; all components resistant to outdoor weathering and corrosion.
