Abstract
The paper proposes a simplified model to deal with a distribution system which involves a number of nodes and branches due to earth wire grounding at every some ten meters. The grounding, which is a typical boundary condition, is combined with the shunt admittance of a distributed-parameter line, and thus a distribution line with a number of the earth wire groundings is represented by an equivalent homogeneous line.
The input impedance evaluated using the proposed model agrees with the accurate input impedance. Transients on a distribution system are calculated using the proposed model and the results show a satisfactory accuracy compared with the accurate solutions. By this approach, a computation time step of a transient is greatly increased and therefore a CPU time and a memory required are greatly reduced. The proposed model is expected to be very efficient to carry a transient analysis on a distribution system.
