Abstract
In rainy weather, charge carries from a d.c. transmission conductor to ground consist of molecular ions produced by corona discharge and water drops which drip from the conductor or are charged on their way to ground. In this paper, the behavior of charged water drops dripping from the conductor and the corona discharge on them were investigated to obtain basic data on ion flow electrification phenomena in foul weather. Four distinct modes of specific charge of water drops were found and the effects of flow rate of water supplied to the conductor, conductor size and smoothness of the conductor surface on them were measured. Moreover, a relation between corona discharge, the specific charge on water drops and the dripping fashion of water drops has been described. Under an operating field strength on a d.c. transmission conductor, the specific charge on water drops from a positive conductor may reach 6 × 10 −4 C/kg and plays an important role in building up a high voltage on an object with a high leakage resistance of the order of 10 11 ohms or more.
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