Abstract:
IEC 60071-2:1996 [1] specifies and recommends. the application and selection of insulation level of equipment, or equipment installation in 3-phase system. This is an important issue as it involves a high investment cost. The main objective of IEC 60071-2:1996 is to determine the rated withstand voltage of equipment in range I (from 1 kV to 245 kV) and in range II (from 300 kV to 800 kV). This standard covers both the phase-to-earth (p-e) and phase-to-phase (p-p) insulation. The insulation co-ordination procedure can reduce accidental rate of equipment damage during the operation, reduce disadvantage of work outage, and also reduce maintenance cost. A computer software is developed to demonstrate the calculation steps of the insulation co-ordination to achieve the standard rated withstand voltage of an equipment. User can change input parameters in each step, e.g. overvoltages source, the selection of surge arrester. The aim is for the convenience in the calculation and benefit in the analysis of calculation result.