This paper describes the new measuring method of the phase current for the high voltage three-phase cable. 24 pieces of independent coils wound around the coreless bobbins are used to compose the CT sensor. The primary phase current may be calculated from the output voltage of each coil. The certain correlation between the output voltage and primary phase current is observed by the experimental data. This new CT sensor enables the measurement of the phase current with whole conductors clamping method for three-phase cable.
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