Strengths and limitations of a new phasor estimation technique to reduce CCVT impact in distance protection |
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Authors: | E. Pajuelo G. RamakrishnaM.S. Sachdev |
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Affiliation: | Power System Research Group, Department of Electrical and Computer Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK S7N 5A9, Canada |
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Abstract: | This paper evaluates the performance of a new least squares approach that improves the accuracy and speed of convergence of the voltage phasors estimated during CCVT transient conditions. A justification of the validity of the linear mathematical model for the CCVT used is provided together with a short study about the risk of transient ferroresonance. Also, a discussion is presented about operating times of numerical distance relays and the importance of the new phasor estimation considered. The methodology followed to achieve a realistic evaluation in a variety of scenarios is presented. The results show the improvements achievable in most conditions, but also highlight an example scenario where the new method has limitations. |
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Keywords: | Coupling capacitor voltage transformer Distance relays Phasor estimation Least squares method |
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