USCO Power Switches

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Main Switch Bearings The ATR incorporates rugged switch bear- ings consisting of stainless steel balls, utilizing stainless steel bearing races (145 - 245kV) with galvanized ductile iron housings and rotors. The bearings are sealed at the factory for maintenance free service. Factory adjusted stops are provided with the bearing for ease of synchronization during installa- tion. At 362kV and above the main bearing is a Timken roller bearing. Switch Bases Hot dipped structural steel channel is used for the construction of the switch base. Lev- eling studs are provided on the bearings for insulator alignment. Bases and base mount- ing dimensions can be customized to your specifications and structure. Insulators The ATR is designed to accommodate com- mercially available insulators with either five The ATR may be operated with a swing handle, gearbox or motor operator. Control arrangements are factory designed and customized to your structure, with all link- age components factory cut to the required dimensions. or seven inch bolt circle. Operating Mechanisms

Hinge Current Transfer The ATR has no hinge contacts; therefore it allows current transfer with maximum reli- ability. Transfer of current at the hinge end of the blade is accomplished with a welded alumi- num laminated conductor, precisely formed and assembled to give thousands of trouble- free operations. This eliminates bolted or sliding pressure connections, threaded joints or high-pressure contacts, enabling ease of operation. Welded connections create a sin- gle conductive metallic path from the hinge terminal pad to the jaw end of the blade. The laminated conductor is constructed of commercially pure aluminum strip, which does not work harden during operation. Extensive mechanical, electrical, and envi- ronmental testing along with years of field experience, prove this approach to current transfer superior to any conventional en- closed or open-hinge contact design.

D O U B L E C E N T E R B R E A K

SEPTEMBER 2013

HUBBELL / USCO  – LEEDS, ALABAMA USA