Current Transformer Dimensioning for Numerical Protection Relays

Author

Gangadharan, Pradeep Kumar ; Sidhu, Tarlochan S. ; Finlayson, Gregory James

Author_Institution

Univ. of Western Ontario, London, Ont.

Volume

22

Issue

1

fYear

2007

Firstpage

108

Lastpage

115

Abstract

In this paper, a study conducted to analyze the factors influencing the current transformer (CT) dimensioning for numerical relays is presented. The study identifies the factors contributing to the CT dimensioning. It analyzes the influence of system parameters on the dimensioning factor and also identifies the critical applications and conditions that determine the CT dimensioning. The errors introduced in phasor estimation of saturated current signals are also described in this study

Keywords

current transformers; power transformer protection; relay protection; current signal saturation; current transformer dimensioning; numerical protection relays; phasor estimation; Circuit faults; Current measurement; Current transformers; Discrete Fourier transforms; Fault currents; Knee; Power system protection; Power system relaying; Power system transients; Protective relaying; CT saturation; Current transformer (CT); discrete Fourier transform (DFT); knee point voltage; numerical relays; phasor estimation; remanent flux; steady-state error; transient error;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2006.881601

Filename

4039427