Self-testing features of sensing and control electronics for a power grid protection system
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United States of America Patent
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Jul 7, 2015
Grant Date -
Nov 21, 2013
app pub date -
May 21, 2013
filing date -
May 21, 2012
priority date (Note) -
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Abstract
Systems and method for detecting potentially harmful harmonic and direct current signals at a transformer are disclosed. One system includes a protection circuit electrically connected to a transformer neutral, the transformer electrically connected to a power grid, the protection circuit including a DC blocking component positioned between the transformer neutral and ground and one or more switches selectively actuated to form a path between the transformer neutral and ground in the event of unwanted DC current at the transformer neutral. The system also includes a control circuit electrically connected to the protection circuit and positioned to selectively actuate the switches based on observed conditions within the protection circuit. The system further includes a plurality of test connections disposed within the protection circuit and useable to test electrical properties of the protection circuit.
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