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This paper presents a novel method of inductance calculation for the incomplete loop problem. This method is based on the relationship between inductance and induced voltage from the circuit theory. The method embarks from Faraday’s Law, and calculates induced voltage of every flux element. Total induced voltage is given by summation of elements and then the inductance value is obtained. Numerical calculations are made for showing that this method is available and more accurate than partial inductance theory. The method may also be applied toward complete loop problems, and gives identical formulas as existing methods. [ABSTRACT FROM AUTHOR]

A modified method based on the optimized charge simulation method (CSM) is used to predict the corona onset voltage and electric field when the space charges due to the corona are considered. Based on the streamer model of corona discharge, space charges generated near the conductors are predicted. In order to calculate the electric field at the conductor surface, space charges are replaced by some equivalent line charges near the conductor. Because of the existence of space charges, the corona onset electric field is changed a little. After a simplified model of actual power transmission lines is introduced with the help of rough coefficient, the corona onset voltage and corona onset electric field are calculated for different types of conductors finally. [ABSTRACT FROM PUBLISHER]