| 摘要 |
<p>A current measurement technique is disclosed in which a family of transformer coils having the same number of turns and the same winding resistance may be associated an active circuit for presenting a burden resistance of substantially zero value. The impedance of the coils will vary with their window size, and the active circuitry will reduce the burden resistance accordingly so that reductions and impedance do not result in introducing additional error into measurements. The circuitry may be used for measuring current in single conductors or in multiple conductors passing through the transformer coil, such as for ground fault measurement, monitoring and control.
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