Open AccessDetailed modelling and analysis of digital mho distance relay with single-pole operation
Author(s) -
Paulo Henrique Barbosa de Souza Pinheiro,
Mayara Helena Moreira Nogueira Santos,
Angêlo Cesar Colombini,
Bruno Wanderley França,
Márcio Zamboti Fortes
Publication year - 2021
Publication title -
acta polytechnica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.207
H-Index - 15
eISSN - 1805-2363
pISSN - 1210-2709
DOI - 10.14311/ap.2021.61.0537
Subject(s) - relay , fault (geology) , protective relay , fault detection and isolation , fault indicator , digital protective relay , stuck at fault , admittance , engineering , range (aeronautics) , control theory (sociology) , power (physics) , electronic engineering , real time computing , computer science , electrical engineering , electrical impedance , artificial intelligence , physics , control (management) , quantum mechanics , aerospace engineering , seismology , actuator , geology
This paper introduces a methodology for modelling a digital admittance-type distance relay using PSCAD/EMTDC. The proposed distance relay was tested in a simulation of the Brazilian power grid with predetermined fault scenarios. The goal of this paper is to make a detailed evaluation of the mho distance relay. The main aspects include the correct operation of the distance relay, fault resistance effects on the mho characteristics, and the fault detection time of this relay. A new approach to analyse the fault detection time is presented, considering several simulated fault scenarios. The results demonstrate that the fault resistance influences the fault detection time and severely affects the distance relay’s general performance. The fault detection time is not constant. It varies within a time interval, considering different fault types, fault locations, and fault resistances. The confidence interval calculation provides a detailed range of the fault detection time, considering its upper and lower limits.