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
Página de inicio (Recomendado-único)
130931.0
Página final (Recomendado-único)
130941
Identificador del recurso (Mandatado-único)
artículo original
Versión del recurso (Recomendado-único)
versión publicada
License
CC BY NC 4.0
Condición de la licencia (Recomendado-repetible)
CC BY NC 4.0
Derechos de acceso
acceso abierto
Access Rights
acceso abierto
Id de Web of Science
WOS:001116099500001
ISSN
2169-3536
Tipo de ruta
verde# dorado
Categoría WOS
Informática
Ingeniería
Telecomunicaciones
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