Artículos

Time Coordination by Time Adaptive Function

Coordinación de Relevadores de Sobrecorriente con Funciones Adaptativas de Tiempo

Arturo Conde Enríquez^1*, Ernesto Vázquez Martínez^1** and Juan Carlos Escobar Martínez²

¹ Universidad Autónoma de Nuevo León, Monterrey, NL, México. ^*con_de@yahoo.com, ^**evm@ieee.org

² Prolec GE in technology development, Monterrey, NL, México. Juan.Escobar@ge.com

Article received on May 09, 2007
Accepted on December 04, 2008

Abstract

This paper presents a new coordination process for time overcurrent relays. The purpose of the coordination is to find a time element function that allows it to operate using a constant back–up time delay for any fault current. Then, a simple methodology is proposed that improves the time coordination even with the presence of distributed generation. Experiments were carried out in a laboratory test situation using signals from a power electrical system physics simulator. A virtual prototype of the time overcurrent relay with adaptive algorithms was developed using real time acquired signals. The tests showed the enhanced performance of the overcurrent relay.

Keywords: Time overcurrent relay, coordination, distributed generation.

Resumen

En este artículo se presenta un nuevo proceso de coordinación de relevadores de sobrecorriente de tiempo inverso. El objetivo del proceso de coordinación propuesto es determinar una función de tiempo que permita un intervalo constante de tiempo de respaldo para cualquier valor de corriente de falla. Se propone una metodología que mejora la coordinación aun con la presencia de generación distribuida. Se realizaron pruebas de laboratorio usando señales provenientes de un simulador físico de sistemas eléctricos de potencia. Se desarrolló un prototipo virtual de un relevador de sobrecorriente con los algoritmos adaptativos propuestos y se realizó la validación de los mismos usando señales en tiempo real. Las pruebas realizadas mostraron un mejor desempeño del relevador de sobrecorriente.

Palabras clave: Relevador de tiempo inverso, coordinación, generación distribuida.

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