HYDROLOGICAL CYCLE AND HUMIDITY ON THE BEHAVIOR OF PARTIAL DISCHARGES IN HYDROGENATOR

Eder S. de Lucena, Terezinha F. de Oliveira, Marinalva C. Maciel, Joo M.B. Protzio, Antonio A.F. de O. Oliveira, Maria R.M. Tavares, and Fernando de S. Brasil

Keywords

Partial discharges, humidity, electrical insulation, data model

Abstract

This study analysed the influence of the hydrological cycle and the humidity on the behaviour of partial discharges (PD) in a hydrogenerator at the Tucuruı Hydroelectric Power Plant, located in a region with a hot and humid climate and a high rainfall index. Two capacitive couplers connected on the left and right side of the stator winding obtained the PD data in four measurements during the high- and low-water cycle. Exploratory analysis and statistical modelling showed that the highest occurrences of discharges occurred in the high-water cycle in small amplitudes from −100 to 100 mV, which may be caused by the increased effort of the hydrogenerator and the increased relative humidity in this period.

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