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| Motion Control: Spacer Dampers |
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Spacer dampers were originally developed to suppress bundle conductor subspan oscillations that could cause damage to multi-conductor bundle systems. Later, it was determined that they could be used to control aeolian vibration as well as wake-induced oscillation. The spacer damper is designed to maintain the original geometry of the bundle system against loads. It must also restore the bundle to normal posture after experiencing severe loads due to short-circuit currents, ice and wind.
The ACA Spacer Damper combines the function of a spacer in maintaining conductor separation and the function of a damper in controlling aeolian vibration and oscillation. The viscoelastic bushings firmly grip the conductor. ACA has developed spacer damper designs to meet various bundle configurations and installation requirements. |
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What is wake-induced oscillation?
Wake-Induced Oscillation is a swinging motion, like a pendulum, that is caused when wind blows across a bundle of conductors. As the conductors move back and forth, there is a potential of the conductors to touch, thus causing significant damage. Alcoa has been researching oscillation to understand it and has developed improved accessories to control it.
Features:
Controls Oscillation and Aeolian Vibration
The Spacer Damper is the most efficient way to extend the life span of the transmission line. It is designed to dissipate the damaging vibrations caused by wind.
No Special Tools Needed with Breakaway Bolt Option
With the breakaway bolt, no special tools or torque wrench is needed. Simply tighten the bolt until the head shears off, indicating proper torque has been achieved.
Customized Designs
ACA can engineer a line protection system for any particular project. The Spacer Dampers are available for 3 and 4 conductor bundles. Standard spacing is 18 inches. For alternate spacing and bundle design, contact ACA Technical Support Team.
Vibrec™ Damper Recommendation Program
The Vibrec damper recommendation program assists in spacer damper requirements for transmission lines. For more information visit www.Vibrec.com or contact the ACA Technical Support Team at 1.800.866.7385.
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