Testing of current transformers
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United States of America Patent
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Apr 18, 2006
Grant Date -
Sep 29, 2005
app pub date -
Jun 25, 2004
filing date -
Feb 4, 2004
priority date (Note) -
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Abstract
A method for evaluating the accuracy of a current transformer is presented. The current transformer has a primary winding and a secondary winding. A current is not circulated through the primary winding. A load is disconnected from the current transformer. A load impedance is measured of an internal instrumentation associated with the current transformer. The resistance in the secondary winding of the current transformer is determined. The load impedance is compared to a standard burden. A standard burden value is selected. The secondary voltage for a rated current is determined. The injection voltage is adjusted to the value of the secondary voltage. The exciting current and power are measured. The ratio error or the phase angle are then calculated by using the exciting current and power.
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