Abstract
A resistive-current extraction algorithm to assist
with on-line monitoring of surge arresters is proposed in this
paper. The algorithm is based on the improved equivalent model
for surge arresters and combines evolutionary optimisation with
the base-frequency approximating method. A genetic algorithm
is used to obtain the optimal capacitance such that the phase shift
between the base-components of the branch voltage and current
is minimised thereby yielding a good approximation of the
resistive current. In this paper, the algorithm is implemented and
tested using Matlab/Simulink. Results indicate that the proposed
algorithm is able to efficiently and accurately obtain the resistive
component of the leakage current, using the improved equivalent
model, under both ideal and distorted supply conditions.