Introduction: NG currently uses a range of twin response dampers with bolted clamp attachment based upon optimum performance based on corona performance and mid range damping qualities. These generic designs are between 20 & 30 years old, with the improvements in analytical design tools National Grid are seeking to develop a damper that has acceptable corona performance at 400kV, increased reliability of attachment points, minimised conductor damage & improved damping efficiency.

Objectives: Meet all requirements of TS 3.4.7 on Zebra and Araucaria conductors.

Design attributes to ensure approval for future high temperature conductors.

More conductor friendly than current designs, expected to reduce damage and mechanical stresses at attachment points.

Improved damping efficiency - multi response as opposed to current twin response for increased conductor life.