Effects of the intensity of precipitation and transverse wind onthe corona-induced vibration of HV conductors

摘要

The effects of rainfall intensity, electric field strengths,alternating and both polarities of direct voltage, and the velocity ofan ACSR conductor were studied. The results obtained showed that theamplitude of the vibration was linearly proportional to the intensity ofprecipitation up to 24 mm/h. When the intensity of precipitation washigher than 24 mm/h, the amplitude of the vibration remained constant.At a constant intensity of precipitation and a steady vibration, theamplitude of the vibration was generally highest with negative DC fieldsand lowest with AC fields. The effects of transverse wind velocity uponthe vibration were studied under a constant precipitation rate using awind tunnel generating winds with velocities up to 50 km/h. As a result,two critical wind velocities, V_C1 andV_C2, were established. V_C1represented the point at which the corona-induced vibration began todecrease and V_C2 the point at which the vibrationstopped. Under both alternating and direct voltages, V_C1 decreased with an increase in the applied field, while V_C2 remained at about 25 km/h. Photographs of water dropletshanging from the conductor were taken in order to document the effect ofwind velocity on the shape of the hanging drops