In-service testing of current transformers
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United States of America Patent
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Jan 20, 2004
Grant Date -
Aug 15, 2002
app pub date -
Jan 28, 2002
filing date -
Feb 15, 2001
priority date (Note) -
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Abstract
A system and method for testing an on-line current transformer is provided. The current transformer includes a primary winding and a secondary winding. An operating current continues to flow through the primary winding during testing of the current transformer. A controllable load is applied to the current transformer secondary winding. The controllable load is varied over a range of load settings including a maximum current setting and a maximum voltage setting. At a plurality of load settings within the range of load settings, a current flowing through the current transformer secondary winding is measured. Also, a voltage across the current transformer secondary winding is measured. An actual excitation curve is generated from the measured currents and voltages corresponding to the plurality of load settings.
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