Compact Arrangement High voltage disconnect switch-363kV 420kV 550kV

Key Features

• Bus-mounted vertical telescopic design：Single-post structure mounts directly under the overhead busbar without additional support columns, saving switchyard space and reducing foundation work compared to conventional two-post or three-post configurations
• Forceps-type self-locking contact：External stainless steel spring maintains constant contact pressure independent of current flow; contact clamping force increases automatically under short-circuit conditions due to magnetic pinch effect, preventing contact lift-off
• Sealed anti-corrosion construction：Contact base welded to the upper guide tube prevents water penetration into the clamping head; draw rod connection is uniquely sealed to eliminate water accumulation inside the conductive arm, preventing internal corrosion and ice-induced mechanism jamming in winter
• Two-step earthing switch：Earthing rod rotates vertically, extends upward, and plugs into a star-shaped fixed contact in two distinct motions: vertical rotation followed by automatic insertion, ensuring reliable plug-type contact capable of withstanding heavy short-circuit currents
• Arc contact for current switching： Optional arcing contacts installed on the main and fixed contacts enable the disconnector to switch capacitive line-charging currents and inductive transformer magnetizing currents within defined limits, extending functionality beyond basic isolation
• Flexible shunt current path： Current transfers through the foldable joint via a flexible soft connection without sliding contacts, eliminating contact wear at the hinge and ensuring stable resistance across the full mechanical life