Repositorio UFRO · Omeka S

Humidity and Harmonic Current Considerations for Indices to Estimate Contamination Levels on HV Insulators

Primer Autor	Villalobos, Rodrigo J.
Co-autores	Moran, Luis A. Inostroza, Mauricio Hoffer, Alvaro Pesce, G. Cristian Huenupan, Fernando
Título	Humidity and Harmonic Current Considerations for Indices to Estimate Contamination Levels on HV Insulators
Editorial	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Revista	IEEE ACCESS
Lenguaje	en
Resumen	Measuring the leakage current and voltage of an insulator is widely used to calculate indices for the pollution estimation of overhead line insulator strings. These indices are intended to be used for the online condition monitoring of insulators to prevent flashover failure. The variability of the data over time causes questionable results when these indices are used in real time. To improve the performance of the indices, this study focuses on analyzing the leakage current and its harmonics over a time dimension to demonstrate the amplitude changes and their causes. For this purpose, the concept of harmonic impedance for insulators was introduced. In an artificial fog chamber, a U120B insulator is subjected to several tests with different levels of contamination and varying levels of constant humidity. The results showed that the equivalent impedance of the insulator varied significantly over time (up to four times). This variation is due to the water absorption process captured by the insulator and depends on the level of contamination and humidity. The 5th and 7th-order harmonic impedances are stable over time, with exceptional variations of less than 9%, therefore, harmonic currents depend only on the voltage harmonics. In contrast, the 3rd and 9th-order harmonic impedances exhibited amplitude variations of up to 9.1 times. Finally, several indices are evaluated. The phase difference angle (PD) index performed best at a constant humidity and steady-state leakage current.
Fecha Publicación	2023
Tipo de Recurso	artículo original
doi	10.1109/ACCESS.2023.3335001
Formato Recurso	PDF
Palabras Claves	Condition monitoring Leakage currents Power transmission lines insulator leakage current pollution estimation overhead lines
Ubicación del archivo	http://dx.doi.org/10.1109/ACCESS.2023.3335001
Categoría OCDE	Informática Ingeniería Telecomunicaciones
Materias	Monitoreo de condición Corrientes de fuga Líneas de transmisión de energía aislante corriente de fuga estimación de la contaminación titulares
Versión del recurso (Recomendado-único)	versión publicada
Tipo de ruta	dorada verde
Access Rights	acceso abierto
Derechos de acceso	acceso abierto
Id de Web of Science	WOS:001116099500001
Página de inicio (Recomendado-único)	130931.0
Página final (Recomendado-único)	130941
Identificador del recurso (Mandatado-único)	artículo original
License	CC BY NC 4.0
Condición de la licencia (Recomendado-repetible)	CC BY NC 4.0
ISSN	2169-3536
Categoría WOS	Informática Ingeniería Telecomunicaciones
Referencia del Financiador (Mandatado si es aplicable-repetible)	ANID FONDEF