Title :
Shielded electronic current transformer
Author :
Slomovitz, Daniel ; De Souza, Heriguatí
Author_Institution :
UTE Lab., Montevideo, Uruguay
fDate :
4/1/2005 12:00:00 AM
Abstract :
A current transformer with nominal ratio 10 A to 10 mA, intended for low-frequency applications, was developed. It includes an electronic device to reduce the magnetizing current, and a continuous shield in the secondary winding (coaxial cable) in order to eliminate the effect of stray capacitances. No guard-source is connected to the shield. It is proposed in this paper to leave the cable-shield-potential floating. This leads to high-accuracy results (ratio errors and phase-displacements in the order of few parts in 106 from 50 Hz to 1 kHz).
Keywords :
current transformers; magnetic shielding; transformer windings; 0.01 to 10 A; cable-shield-potential floating; coaxial cable; continuous shield; electronic device; low-frequency applications; magnetizing current reduction; measuring transformer; phase displacement; power frequency; secondary winding; shielded electronic current transformer; stray capacitances; Cable shielding; Capacitance; Coaxial cables; Conductors; Current transformers; Frequency; Magnetic devices; Magnetic flux; Magnetic shielding; Resistors; Compensation; current; error; guard; measuring transformer; phase displacement; power frequency; shield;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2005.843565
