Publication: Assessment on the current transformer performance under the effect of power system harmonics
Date
2023-07
Authors
Muhammad Adli bin Mohd Ribi
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Abstract
This research was implemented to study the use of current transformers as instrumental transformers. Generally, overall finding from this project is known as the current transformer will fail to operate correctly when a certain level of harmonic percentage is present in power system. The implementation of non-linear loads in electrical systems today has increased along with the latest technology. However, the use of nonlinear loads greatly contributes to higher harmonic distortion occurring in the electrical distribution system. Examples of non-linear loads that exist today are rectifiers, alternating current to direct current power converters. Main issue regarding the implementation of higher harmonic distortion in power system will cause the performance of current transformer fail to convert current values stated on the current transformer itself. Therefore, this study will study the performance of CT under linear and non-linear load and do an assessment
of the performance and effects on the CT with different levels of THD percentage. The error percentage ratio for current transformers is measured to observe the functionality of current transformer. In this project, an experiment was carried out at the Power Laboratory of the School of Electrical and Electronics Engineering and a software simulation is done using MATLAB Simulink to simulate the operating current transformer with linear and non-linear load. The current transformer with a ratio of 7.5/1 A and a secondary load or CT burden for the current transformer is selected in this study. With this study, more understanding is acquired regarding the effect of the power system harmonics on the current transformer operation.