Shielded electronic current transformer

Author

Slomovitz, Daniel ; De Souza, Heriguatí

Author_Institution

UTE Lab., Montevideo, Uruguay

Volume

54

Issue

2

fYear

2005

fDate

4/1/2005 12:00:00 AM

Firstpage

500

Lastpage

502

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;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2005.843565

Filename

1408219