A Novel Electronic Current Transformer for High Voltage Systems
This paper illustrates a novel electronic current transformer (ECT) with a power source at ground potential. Employ the insulation structure of the traditional transformer insulated by SF6, the sensing unit with an air-core coil for measurement and protection transmits the electrical signal to the signal processing unit at the ground potential. Then the optical power source could be abandoned and the reliability is effectively enhanced. Utilizing mathematical models, designations and emulations have been done to compute the influence of the ambient temperature. Tests have been done and the experimental results show that this ECT meets the requirement of the 0.2s class for measurement and 5PTE for protection in IEC60044-8 respectively.
T. Song, "A Novel Electronic Current Transformer for High Voltage Systems", Advanced Materials Research, Vols. 588-589, pp. 558-562, 2012