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Session 2533

EXPERIMENTAL VERIFICATION OF POWER SYSTEM CURRENT AND VOLTAGE SYMMETRICAL COMPONENTS

John Aspnes Electrical Engineering Department University of Alaska Fairbanks Fairbanks, Alaska 99775 E-mail: ffjda@uaf.edu

ABSTRACT: This paper reports results of an experimental approach to determining symmetrical components of both currents and voltages in an unbalanced three-phase electric power system. An active filter circuit described in a previous publication has been enhanced with current shunts which convert secondary current of current transformers to a measurable voltage. This enhancement allows the measurement of symmetrical components of currents while the circuit previously presented was capable of measuring only symmetrical components of voltages. Combining the two capabilities allows experimental verification of calculations which determine symmetrical components of voltages and currents associated with unbalanced and ungrounded loads.

1. Introduction

This paper reports results of an experimental approach to determining symmetrical components of both currents and voltages in an unbalanced three-phase electric power system. An active filter circuit described in [1] has been enhanced with current shunts which convert secondary current of current transformers to a measurable voltage. This enhancement allows the measurement of symmetrical components of currents while the circuit presented in [1] was capable of measuring only symmetrical components of voltages. Combining the two capabilities allows experimental verification of calculations which determine symmetrical components of voltages and currents associated with an unbalanced and ungrounded wye- connected load. Reference [2] examines this configuration in an end-of-chapter problem which illustrates that line to floating neutral voltage of the load contains only positive- and zero- sequence components, while load currents have only positive- and negative-sequence components. This paper presents experimental data which verify calculated values.

The University of Alaska Fairbanks (UAF) electric power option students complete a four- credit energy conversion course in the fifth semester and four-credit electric power courses in the sixth and seventh semesters. The following material appears in the first electric power course in support of teaching symmetrical components. The author has used this laboratory exercise for several years and has found that it enhances student understanding and acceptance

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Aspnes, J. (1999, June), Experimental Verification Of Power System Current And Voltage Symmetrical Components Paper presented at 1999 Annual Conference, Charlotte, North Carolina. 10.18260/1-2--7664