Open AccessA Study on a Catenary Impedance Estimation Technique using Boosting Current Compensation Based on Current Division Characteristics of an AT Feeding System
Author(s) -
Hosung Jung,
Hyungchul Kim,
SeungHwan Chang,
Joorak Kim,
MyungHwan Min,
TaePung An,
Sung-Il Kwon
Publication year - 2015
Publication title -
journal of electrical engineering and technology/journal of electrical engineering and technology
Language(s) - English
Resource type - Journals
eISSN - 2093-7423
pISSN - 1975-0102
DOI - 10.5370/jeet.2015.10.3.1370
Subject(s) - catenary , electrical impedance , engineering , current (fluid) , fault (geology) , compensation (psychology) , relay , electronic engineering , electrical engineering , power (physics) , structural engineering , psychology , physics , quantum mechanics , seismology , psychoanalysis , geology
Generally, an autotransformer(AT) feeding system consists of double tracks, up and down, with the trolley wire and feeder wire of the up and down tracks connected in the sectioning post(SP). Consequently, load current or fault current flows on two tracks based on catenary impedance characteristics, making it difficult to estimate catenary impedance accurately. This paper presents a technique for the estimation of catenary impedance using boosting current compensation based on the current division characteristics of an AT feeding system to improve the operation performance of impedance relay. To verify the technique, we model an AT feeding system through a power analysis program (PSCAD/EMTDC) and simulate various operation and fault conditions. Through the simulation, we confirmed that the proposed technique has estimated catenary impedance with a similar degree of accuracy to the actual catenary impedance.