Abstract:
Sweep Frequency response analysis is a widely
used condition monitoring technique of power transformers that
includes interpreting transfer function in frequency domain. This
paper presents a novel approach to model the transfer function
numerically in laplace domain. Derivation of transfer function
involves complex mathematical calculations as it is a ratio of
two high order polynomials resulted by the complex nature of
circuitry inside power transformers. An algorithm, based on
Levy’s and Sanathanan-Koerner method, presented in this paper
can be used to derive entire transfer function accurately and more
efficiently. Estimated transfer functions using this method can be
incorporated in transformer fault diagnosis especially for internal
faults caused by winding deformation and core displacement.
