Charge Simulation Modelling of Three-Core Belted Cables

A charge simulation method is used to represent sheathed, three-core, belted cables having circular conductors. Each conductor is represented by Nc infinite line charges arranged in a circular pattern inside the conductor. The sheath is represented by Ns infinite line charges arranged in a circular pattern, outside the sheath. It is shown that if the total number of representative charges is in the range of 60 to 80, a very accurate simulation is achieved. For best overall accuracy, the Ns/Nc ratio should be kept in the range of 1.5 to 2.1. Under such conditions, the percentage potential error is normally below 0.2% whereas the field deviation angle is less than 0.3 degrees.