Abstract
In high voltage transmission projects, the discharge voltage prediction of practical air gaps is a troublesome and long-awaited objective. For transmission line–tower air gaps, full-scale discharge tests can be expensive and prolonging. For the gap geometries in practical engineering, we cannot completely simulate all of them. In this paper, test samples taken for simulation are two types of actual gap geometries used in UHV transmission systems. The discharge path needed for a 250/2500μs 1000 kV switching impulse was found. For this, the two-dimensional finite element models of a UHV cup-type transmission line and a UHV compact type transmission line were established for electric field calculation. Then some features were extracted from the hypothetic discharge channel between the bundled conductor and the tower. Thus, various electric field features of the geometries are obtained. These values are verified by comparing it with the values obtained from the extensive literature survey. Discharge voltage characteristics of both geometries are also calculated and compared for different gap distances.
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