Performance evaluation of HV CTs subjected to actual operating conditions in substations and its impact on smart metering infrastructure within smart grids

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Conference2012 IEEE Power & Energy Society General Meeting. New Energy Horizons - Opportunities and Challenges, 2012-07-22 - 2012-07-26, San Diego, CA
Pages12; # of pages: 2
SubjectEHV substations; EHV transformers; current transformers; instrument transformers; measurement; repeatability; revenue metering; smart grids; stability
AbstractInstrument transformers are crucial elements in the metering infrastructure of high voltage grids. With the evolvement of smart grids and the liberalization of the electricity market, new billing points can arise in the grids where electrical energy is transferred between different parties. When these new billing points are at existing places in the grid, it is strongly preferred to use the available instrument transformers for realization of a revenue metering system rather than installing new CTs and PTs. However, these available instrument transformers do not always meet the accuracy class requirements prescribed by legislation like electricity metering codes. In this paper, we present the results of an extensive performance evaluation of the ratio error of high voltage CTs under actual operating conditions. The aim of this evaluation was to find out to what extent CTs that do not meet the required accuracy class can nevertheless be used for revenue metering systems when their ratio errors are measured and corrected for. The study has a significant impact on the expansion of the metering infrastructure within smart grids, since it paves the way to a significant cost saving in the realization of new revenue metering setups.
AffiliationMeasurement Science and Standards; National Research Council Canada
Peer reviewedYes
NPARC number21269142
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Record identifier72d20bdb-2a33-4ab2-978f-b134fd5796d8
Record created2013-12-10
Record modified2016-05-09
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