Monitoreo de Descargas Parciales En-línea en Generadores Eléctricos de Alta Tensión
Rotating electric machines with operating voltage greater than 12 [kV] are an integral part of the installed base of electric generators in different countries. These voltages incorporate new challenges to be solved in maintenance practices. One of the most important challenges is the identification of the condition of the stator winding. For many years, the most commonly used monitoring techniques in electrical generators were off-line insulation measurements, especially in direct current. More recently, the use of on-line insulation monitoring techniques has enabled problems to be detected in advance, such as partial discharge measurement. This article presents the measurement of on-line partial discharges, as a condition monitoring technique for high voltage electric generators. It is also used for risk assessment and decision support for corrective actions. In the case study, it was evidenced that periodic monitoring is key during the operating time of the evaluated generator unit, which can be extended to other generators. The monitoring of on-line partial discharges allowed to know its condition and evolution through the trend in time.
Keywords: Partial discharge, electric generator, failure mode, predictive maintenance, void.
 Burgess, Andrew, Marc Foxall, and Thomas Raczy. (2014). “On-Line Partial Discharge Insulation Condition Monitoring of Complete High Voltage Networks in the Oil and Gas Industry.” Pp. 14–23 in IEEE Petroleum and Chemical Industry Conference, edited by IEEE. Rio de Janeiro, Brazil: IEEE.
 Campuzano, Ignacio. (2016). “Diagnóstico de Generadores Eléctricos de Potencia Con Técnicas de Monitoreo En Línea Y Fuera de Línea.” Información Tecnológica 27(2):11–20.
 Deshpande, A. S., H. A. Mangalvedekar, and A. N. Cheeran. (2013). “Electrical Power and Energy Systems Partial Discharge Analysis Using Energy Patterns.” Electrical Power and Energy Systems 53:184–95.
 Farahani, Mohsen, Hossein Borsi, and Ernst Gockenbach. (2005). “Partial Discharge and Dissipation Factor Behavior of Model Insulating Systems for High Voltage Rotating Machines Under.” IEEE Electrical Insulation Magazine 21(5):5–19.
 IEEE Power and Energy Society. (2013). IEEE 43-2013 Recommended Practice for Testing Insulation Resistance of Electric Machinery. New York, USA.
 IEEE Power and Energy Society. (2014). IEEE 1434-2014 Guide for the Measurement of Partial Discharges in AC Electric Machinery. New York, USA.
 Inducor Ingeniería S.A. (2015). Diagnóstico Por Descargas Parciales en Generadores y Motores. Argentina.
 Marketz, Michael, Christian Rupp, and Michael Krüger. (2009). “Unconventional Diagnostic Methods for Testing Generator Stator Windings.” IEEE Electrical Insulation Magazine 25(5):18–24.
 Stone, Greg, Edward Boulter, Ian Culbert, and Hussein Dhirani. (2004). Electrical Insulation for Rotating Machines. Edited by IEEE. Canada: John Wiley and Sons.
 Stone, Greg and Vicki Warren. (2006). “Objective Methods to Interpret PartialDischarge Data on Rotating-Machine Stator Windings.” IEEE Transactions on Industry Applications 42(1):1–6.
 Tetrault, Serge, Greg Stone, and Howard Sedding. (1999). “Monitoring Partial Discharges on 4-kV Motor Windings.” IEEE Transactions on Industry Applications 35(3):682–88.