MOD2 Spacer Damper
MOD2 SPACER DAMPERS PROTECT THE BUNDLED LINE FROM GALLOPING & VIBRATION
Twisting the sub conductors independently – Twisting is achieved by installing the damper in a “Z” between the bundle. This offset to the bundle enables modulation of the conductor stiffness and independent twisting action.
Eccentric weight – the articulating clamps act as offset weight as a secondary galloping control feature. The 90° range of motion by the clamp at the attachment point helps change the wind angle of attack during a galloping event by causing variation in stiffness of the sub conductor. Changing the wind angle of attack is a long-accepted principle for galloping control.
Increased arc of separation between the bundles. Motion by the articulating clamps causes independence in sub conductor motion at 3 degrees, thereby maintaining greater separation between the bundle over longer sections of the span. This arc of separation is equivalent to 23” of spacing, which effectively increases the critical wind speed at which galloping commences.
Impact damper – at the start of conductor motion, the impact among the steel hoop, metal springs, and clamps helps dissipate energy from both low frequency (galloping) and high frequency (vibration).
Installation application – installed at the 1/3rd and 2/3rd points the dampers put a node in the span. This placement transforms a single and double loop gallop into a harmless 3 loop sine wave.