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Using radio frequency and ultrasonic antennas for inspecting pin-type insulators on medium-voltage overhead distribution lines
Aplicación de antenas de radiofrecuencia y ultrasónica para la inspección de los aisladores de tipo pin en líneas aéreas de distribución de media tensión
DOI:
https://doi.org/10.15446/ing.investig.v33n2.39519Keywords:
distribution line, inspection, insulator, radiofrequency/ultrasound antenna (en)líneas de distribución, inspecciones, aisladores, radiofrecuencia, ultrasonidos (es)
This paper summarises the activities undertaken when using antennas (ultrasound and radiofrequency) for identifying insulators in pre-failure state by detecting the noise emitted by the distribution line and correlating this with these insulators (porcelain pin type) dielectric breakdown. This has led to developing low-cost maintenance procedures and providing support and criteria for engineering decisions regarding replacing these insulators. The technique used two detectors; a radio frequency detector was used in a first investigation of a particular distribution line, set to 40 MHz and installed on the roof of a moving vehicle. The ultrasound detector was used for inspecting (phases A, B, C) each structure (pole) selected. Atmospheric conditions had no influence on defining pre-failure insulators (pin type) based on the noise detection technique. Pin type insulators emitting noise should be replaced since measurement was made from the ground and near the base of the post.
En este trabajo se presenta un resumen de las actividades realizadas durante el uso de antenas (ultrasonido y radiofrecuencia) para identificar los aisladores en el estado de previsión de fallos, a través de la detección del ruido emitido por la línea de distribución y la correlación con la ruptura dieléctrica de estos aisladores de cerámica (tipo pin). Esto permitió el desarrollo de los procedimientos de mantenimiento de bajo costo, el apoyo y los criterios para las decisiones de ingeniería dirigidas a sustituir estos aisladores. La técnica utiliza dos detectores. Un detector (radiofrecuencia) se utiliza en la primera investigación de la línea de distribución; está ajustado a 40 MHz e instalado en el techo de un vehículo que se mueve. El otro detector (ultrasonido) se utiliza para la inspección (fases A, B, C) de cada estructura (polo) seleccionado. Las condiciones atmosféricas no tienen influencia en la definición de los aisladores (tipo pin) en prefallo, sobre la base de las técnicas de detección de ruido. Por último, se recomienda la sustitución de aisladores (tipo pin) que emiten ruido, ya que la medición se hace de la tierra y cerca de la base del poste.
References
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Oliveira, H. R. P., Batista, E. L., Lefort, C., De Salles, C., Martinez, M. L. B., Inspection of Pin Insulators in Distribution Medium Voltage Lines & Outage Reductions., In Proc. 2008 IEEE International Symposium on Electrical Insulation, 2008.
Oliveira, H. R. P., Batista, E. L., Lefort, C., De Salles, C., Martinez, M. L. B., Inspection of Pin Insulators in Medium Voltage Distribution Lines and Outage Reduction., In Proc. 2009 CIRED - 20th International Electricity Conference & Exhibition on Electricity Distribution, 2009.
Oliveira, H. R. P., Pelizan, F., Campos, I. G., Lefort, C., De Salles, C., Martinez, M. L. B., De Oliveira, R. G., Evaluation of the Insulation of 15 kV-25 kV Feeders and Procedures for Substitution of Damaged Units., In Proc. 2006 IEEE International Symposium on Electrical Insulation, 2006.
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Copyright (c) 2013 Cícero Lefort Borges, Manuel Luís Barreira Martinez
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