Design of wide-range current transformer based on improved zero magnetic flux and turns compensation

Difficulties in producing CT caused by the current ratio regulation in IEC standard and suggestions of modification

“…The turns ratio N 2 /N 1 should be a decimal instead of an integer to achieve an integer current ratio. However, decimal-turn windings are not easy to design and manufacture, or it is difficult to design and manufacture CT windings that enable the current error to be zero [9].…”

“…Not only is the power factor of the load impedance unequal to one, but also the excitation reactance is not much larger than the excitation resistance. Thus, the phase displacement between İmN 1 and İ0 is not π/2 and is definitely not zero [15], and (8) is more reasonable than (9). Either (8) or (9) can be used to estimate the current error of CTs whose k N is equal to k C .…”

“…Thus, the phase displacement between İmN 1 and İ0 is not π/2 and is definitely not zero [15], and (8) is more reasonable than (9). Either (8) or (9) can be used to estimate the current error of CTs whose k N is equal to k C .…”

“…The method of increasing I 2 or decreasing the number of the secondary turns is currently the turns correction measure used to manufacture CTs [3,9]. The current ratio k C marked on the rating plates is an integer, because the rated currents specified in IEC 61869-2 are integers.…”

Buck Converter Current Measurement Using Differential Amplifier

“…The magnetic indirect current sensing measures current by converting it into the magnetic field and the converted magnetic field is measured in terms of voltage. The magnetic current sensing technology commonly implemented through Current transformer [10][11][12] and Hall based current sensors technology [13][14][15].…”