Solutions for overhead
AR products have been protecting overhead transmission lines in the U.S. and Canada from high amplitude galloping for more than 50 years. A variety of models are available. Made in the USA, AR Products offers solutions intent on asset protection.
SPANS LONGER THAN 800’ AND VERY LONG SPANS LIKE RIVER CROSSINGS SHIELD WIRES AND OPTICAL GROUND WIRES
Uses aerodynamic lift and drag to cause variation in the wind angle of attack along the conductor; creating stability for the entire span. By twisting at the attachment point to the conductor, the Windamper uses gravity and wind force to induce twisting in galloping conditions. For more than 40 years, the Windamper has been protecting long spans, hard-to-reach locations (river crossings), power lines serving large manufacturing operations (steel mills) and the nine circuits serving Niagara Falls.
SHORTER SPANS AND DISTRIBUTION LINES
SMALLER HORIZONTAL AND VERTICAL TRANSMISSION LINES
A torsion damper, Twisters set as eccentric weights that use inertia, acceleration and twist to control galloping. A solution for shorter spans, it twists a single conductor, by inertia offset, both statically and dynamically. Vibration control is achieved by allowing the eccentric weight to move against the vibration. The initial twist angle alters the wind angle of attack to control galloping. Used on power line conductors having shorter spans, it has been installed by helicopter at hot line voltages up to 161kV, and by bucket truck at voltages up to 345kV. Method of application further reduces peak-to-peak galloping amplitude.
AR Twister | Slider
SMALLER OVERHEAD TRANSMISSION
The Twister | Slider reduces galloping of the line by forcing the conductor to twist and unload its aerodynamic lift. An ultra-light weight galloping control solution for today's lighter-weight conductors and single pole lines, the Twister|Slider can also meet the unique needs of optical ground wires and distribution feeder lines, where precise weight is required to set the twist. Using clusters of loose, galvanized iron washers this Twister design controls galloping of the smaller conductor, distribution systems, static lines, OPGW, or steel shield wires. Total weight is adjustable in 3 oz. increments
AR Spacer | Twister
SEPARATE PHASES WITH GALLOPING CONTROL
PROTECTS AGAINST FLASH-OVER WHEN PHASE CLEARANCE DEFICIT
Rotating clamps fitted at the ends of a polymer insulator dynamically twist the single conductor when galloping events occur, while maintaining a separation when there is insufficient clearance between phases. The Spacer Twister has eliminated breaker operations on spans up to 345 kV. The AR Spacer Twister combines the benefits of the twisting action by AR Clamps with the features of the polymer insulators. Interphase spacers (insulators) have a good track record for eliminating flashovers during galloping but unless they have articulating clamps, phase spacers will not prevent galloping motion. Insulator rods used in the AR Spacer Twister have been tested for compressive strength to establish column-buckling behavior. Shorter lengths suitable for underbuilds.