Study on Optimization of Anti-Corona Properties of 330-kV Dampers

A 330-kV Dogbone aeolian vibration damper has two dumbbell-shaped weights, the end of which has high electric-field strengths on its surface where corona discharges may occur in the operation at high altitudes above 1000 m. The corona discharge results in power loss, audible noise, and radio interference, which affect the lives of the surrounding residents. To prevent the corona, the electric-field intensities on the dampers should be reduced by optimizing their structures. In this study, 3-D computational models of Dogbone dampers have been constructed to calculate the electric-field distributions on their weights. The curvature radius of the small end was increased to reduce the electric-field intensities on its surface. When the radius increased from 25 to 35 mm, the maximum electric-field intensity could decrease from 2987 to 2390 V/mm. According to the optimization results, new dampers were manufactured, and their corona and power dissipation characteristics were tested. The test results show that the optimized dampers can prevent corona discharge at altitudes below 3500 m. In addition, the resonant frequency and power consumption of the new dampers greatly changed, but their power dissipation characteristics were better than the original ones.