Toroidal core current transformer with phase compensation circuit
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United States of America Patent
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Jul 3, 2012
Grant Date -
Sep 2, 2010
app pub date -
Feb 17, 2006
filing date -
Feb 22, 2005
priority date (Note) -
Expired
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Abstract
Disclosed is a toroidal core current transformer comprising a primary conductor which penetrates the toroidal core and a secondary winding that is wound around the toroidal core. A measuring shunt (RSh) or a load (Zb) is provided at the secondary end. In order to compensate the phase error (f) between the primary current (IP) and the secondary current (Is), a compensation circuit (K) whose capacity (C) is measured substantially according to equation (I) or (II) is provided at the secondary end. In equation (I) or (II), C represents the capacity of the compensation circuit, ω represents the radian frequency, φ represents the phase error between the primary current and the secondary current, Rsh represents the resistance of an optional measuring shunt, and Zb represents the impedance of an optional load.
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