jacques aubin - Academia.edu (original) (raw)
Papers by jacques aubin
Calculation of electric field distribution in critically stressed insulation areas and comparison... more Calculation of electric field distribution in critically stressed insulation areas and comparison to Weidmann Reference Curve to assess the insulation safety margin
Proceedings of Canadian Conference on Electrical and Computer Engineering
Moisture content of solid insulation is a persistent concern for a power transformer as it causes... more Moisture content of solid insulation is a persistent concern for a power transformer as it causes several detrimental effects on the insulation’s integrity. Moisture content assessment is often derived from a single oil sample submitted to a Karl Fischer test in laboratory although it is recognized that a single oil sampling cannot reveal the moisture content in paper if the oil temperature is unstable. On-line monitoring systems are available and continuous recording allows integration of temperature variations and the computation of a dependable value for moisture content in paper. Collection of data over a long period allows calculation of moisture content of the various components of the solid insulation system even if they are at different temperatures and characterized by different diffusion rates. Field data is presented for an application on a large power transformer along with the model used to derive the water content of insulating paper from water content in oildespite co...
Application of sheet windings is common practice for distribution transformers but is usually onl... more Application of sheet windings is common practice for distribution transformers but is usually only applied to small power transformers. While high eddy losses do occur in some part of the sheet winding a 10 MVA unit has been design and tested to meet IEEE requirements on winding hot spot temperature. Finite element analysis was used to determine the location and magnitude of highest loss density. Thermal modeling was validated with direct measurement of temperature. Fiber optic temperature sensors have been successfully deployed during the temperature rise test to demonstrate accuracy of thermal modeling and loading capability of this prototype transformer.
2016 IEEE Electrical Insulation Conference (EIC), 2016
... Add to Quick Collection. Sokolov, Victor, Aubin, Jacques, Davydov, Valery, Hans-Peter, Gasser... more ... Add to Quick Collection. Sokolov, Victor, Aubin, Jacques, Davydov, Valery, Hans-Peter, Gasser, Griffin, Paul, Koch, Maik, Lundgaard, Lars, Roizman, Oleg, Scala, Mario, Tenbohlen, Stefan, Vanin, Boris. GIGRE (International Council on Large Electric System); 2008. ...
IEEE Power Engineering Review, 1984
ABSTRACT The paper summarizes the results obtained in a series of dielectric and short-circuit te... more ABSTRACT The paper summarizes the results obtained in a series of dielectric and short-circuit tests on power transformers of the 120-161 kV/10-20 MVA class, recently removed from Hydro-Québec's transmission and distribution system. These results show that after many (17 to 27) years of normal service, signs of insulation aging can be observed. The short-circuit withstand capability of the transformers tested was satisfactory up to their full rated short-circuit level however. Some unexpected results were also obtained in tests with switching impulses, which yielded lower withstand capability than in tests with standard lightning impulses.
IEEE Electrical Insulation Magazine, 2000
To reduce the risk of unexpected failure and the ensuing unscheduled outage, on-line monitoring h... more To reduce the risk of unexpected failure and the ensuing unscheduled outage, on-line monitoring has become the common practice to assess continuously the condition of the transformer with. Ideally, transformer monitoring should provide a continuous condition assessment against any incipient fault developing in the transformer. To meet that goal, several diagnostic methods have been developed such as: dissolved gas analysis (DGA), partial discharge (PD) detection with acoustic localization of arcing source, frequency response analysis (FRA), acoustic monitoring of tap changer etc. Theoretically, on-line application of these methods could provide detection of anomaly, identification of the problem and assessment of the severity of the condition. In practice, selection has to be made among the various methods available. Experience has shown that most transformers will spend their life without developing any problems and it would be unproductive to maintain a host of monitoring devices ...
To reduce the risk of unexpected failure and the ensuing unscheduled outage, on-line monitoring h... more To reduce the risk of unexpected failure and the ensuing unscheduled outage, on-line monitoring has become the common practice to assess continuously the condition of the transformer with. Ideally, transformer monitoring should provide a continuous condition assessment against any incipient fault developing in the transformer. To meet that goal, several diagnostic methods have been developed such as: dissolved gas analysis (DGA), partial discharge (PD) detection with acoustic localization of arcing source, frequency response analysis (FRA), acoustic monitoring of tap changer etc. Theoretically, on-line application of these methods could provide detection of anomaly, identification of the problem and assessment of the severity of the condition. In practice, selection has to be made among the various methods available. Experience has shown that most transformers will spend their life without developing any problems and it would be unproductive to maintain a host of monitoring devices ...
Calculation of electric field distribution in critically stressed insulation areas and comparison... more Calculation of electric field distribution in critically stressed insulation areas and comparison to Weidmann Reference Curve to assess the insulation safety margin
Proceedings of Canadian Conference on Electrical and Computer Engineering
Moisture content of solid insulation is a persistent concern for a power transformer as it causes... more Moisture content of solid insulation is a persistent concern for a power transformer as it causes several detrimental effects on the insulation’s integrity. Moisture content assessment is often derived from a single oil sample submitted to a Karl Fischer test in laboratory although it is recognized that a single oil sampling cannot reveal the moisture content in paper if the oil temperature is unstable. On-line monitoring systems are available and continuous recording allows integration of temperature variations and the computation of a dependable value for moisture content in paper. Collection of data over a long period allows calculation of moisture content of the various components of the solid insulation system even if they are at different temperatures and characterized by different diffusion rates. Field data is presented for an application on a large power transformer along with the model used to derive the water content of insulating paper from water content in oildespite co...
Application of sheet windings is common practice for distribution transformers but is usually onl... more Application of sheet windings is common practice for distribution transformers but is usually only applied to small power transformers. While high eddy losses do occur in some part of the sheet winding a 10 MVA unit has been design and tested to meet IEEE requirements on winding hot spot temperature. Finite element analysis was used to determine the location and magnitude of highest loss density. Thermal modeling was validated with direct measurement of temperature. Fiber optic temperature sensors have been successfully deployed during the temperature rise test to demonstrate accuracy of thermal modeling and loading capability of this prototype transformer.
2016 IEEE Electrical Insulation Conference (EIC), 2016
... Add to Quick Collection. Sokolov, Victor, Aubin, Jacques, Davydov, Valery, Hans-Peter, Gasser... more ... Add to Quick Collection. Sokolov, Victor, Aubin, Jacques, Davydov, Valery, Hans-Peter, Gasser, Griffin, Paul, Koch, Maik, Lundgaard, Lars, Roizman, Oleg, Scala, Mario, Tenbohlen, Stefan, Vanin, Boris. GIGRE (International Council on Large Electric System); 2008. ...
IEEE Power Engineering Review, 1984
ABSTRACT The paper summarizes the results obtained in a series of dielectric and short-circuit te... more ABSTRACT The paper summarizes the results obtained in a series of dielectric and short-circuit tests on power transformers of the 120-161 kV/10-20 MVA class, recently removed from Hydro-Québec's transmission and distribution system. These results show that after many (17 to 27) years of normal service, signs of insulation aging can be observed. The short-circuit withstand capability of the transformers tested was satisfactory up to their full rated short-circuit level however. Some unexpected results were also obtained in tests with switching impulses, which yielded lower withstand capability than in tests with standard lightning impulses.
IEEE Electrical Insulation Magazine, 2000
To reduce the risk of unexpected failure and the ensuing unscheduled outage, on-line monitoring h... more To reduce the risk of unexpected failure and the ensuing unscheduled outage, on-line monitoring has become the common practice to assess continuously the condition of the transformer with. Ideally, transformer monitoring should provide a continuous condition assessment against any incipient fault developing in the transformer. To meet that goal, several diagnostic methods have been developed such as: dissolved gas analysis (DGA), partial discharge (PD) detection with acoustic localization of arcing source, frequency response analysis (FRA), acoustic monitoring of tap changer etc. Theoretically, on-line application of these methods could provide detection of anomaly, identification of the problem and assessment of the severity of the condition. In practice, selection has to be made among the various methods available. Experience has shown that most transformers will spend their life without developing any problems and it would be unproductive to maintain a host of monitoring devices ...
To reduce the risk of unexpected failure and the ensuing unscheduled outage, on-line monitoring h... more To reduce the risk of unexpected failure and the ensuing unscheduled outage, on-line monitoring has become the common practice to assess continuously the condition of the transformer with. Ideally, transformer monitoring should provide a continuous condition assessment against any incipient fault developing in the transformer. To meet that goal, several diagnostic methods have been developed such as: dissolved gas analysis (DGA), partial discharge (PD) detection with acoustic localization of arcing source, frequency response analysis (FRA), acoustic monitoring of tap changer etc. Theoretically, on-line application of these methods could provide detection of anomaly, identification of the problem and assessment of the severity of the condition. In practice, selection has to be made among the various methods available. Experience has shown that most transformers will spend their life without developing any problems and it would be unproductive to maintain a host of monitoring devices ...