Inrush current identification based on wavelet transform and correlation factors

The wavelet transform has received great importance in the last years on the power system analysis because the multi-resolution analysis presents proprieties good for the transient signal analysis. This chapter presents a review on main application of wavelet transform in electric power systems. The study areas have been classified as power system protection, power quality disturbances, power system transient, partial discharge, load forecasting, faults detection, and power system measurement. The areas in which more works have been developed are the power quality and protections field, where both cover 51% of the articles analyzed.

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Application of Discrete S-Transform for Differential Protection of Power Transformers

Ashrafian¹,

Rostami²,

Gharehpetian³

et al. 2012

IJCEE

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Abstract-In this paper, a novel scheme based on Hyperbolic S-Transform (HST) is proposed for digital differential protection of power transformers. Hyperbolic S-transform is a powerful tool for non-stationary signal analysis in noisy conditions. Decision logic has been devised using extracted feature from differential currents due to transient phenomena in transformers. The HST of the differential current is calculated. Then, a Decision Index (DI) is calculated according to the spectral energy and standard deviation of the S-matrix. It is seen that DI values are different in the cases of internal faults and inrush currents. The scheme has been implemented in MATLAB environment and the inputs are differential currents derived from EMTP software. In order to simulate the internal turn to turn and turn to earth faults, the power transformer is modeled using 8×8 RL matrices obtained from the subroutine BCTRAN of EMTP software. The differential current signals are infected by noise and the robustness of the algorithm under noisy conditions is investigated.

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Inrush current identification based on wavelet transform and correlation factors

Cited by 4 publications

References 6 publications

Characterization of internal disturbances and external faults in transformers using an S-transform--based algorithm

Characterization of internal disturbances and external faults in transformers using an S-transform--based algorithm

Wavelet Transform Analysis to Applications in Electric Power Systems

Application of Discrete S-Transform for Differential Protection of Power Transformers

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