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PIER PIER B PIER C PIER M PIER Letters
2011-03-01
Insulation Fault Diagnosis in High Voltage Power Transformers by Means of Leakage Flux Analysis
By
Manes Fernandez Cabanas,

    Prof. Manes Fernandez Cabanas

    Electrical Engineering Department

    University of Oviedo

    Spain

    Homepage

Francisco Pedrayes González,

    Dr. Francisco Pedrayes González

    Electrical Engineering Department

    University of Oviedo

    Spain

    Homepage

Manuel García Melero,

    Dr. Manuel García Melero

    Electrical Engineering Department

    University of Oviedo

    Spain

    Homepage

Carlos H. Rojas García,

    Dr. Carlos H. Rojas García

    Electrical Engineering Department

    University of Oviedo

    Spain

    Homepage

Gonzalo Alonso Orcajo,

    Dr. Gonzalo Alonso Orcajo

    Electrical Engineering Department

    University of Oviedo

    Spain

    Homepage

José Manuel Cano Rodríguez,

    Dr. José Manuel Cano Rodríguez

    Electrical Engineering Department

    University of Oviedo

    Spain

    Homepage

Joaquín González Norniella

    Mr. Joaquín González Norniella

    Electrical Engineering Department

    University of Oviedo

    Spain

    Homepage

Progress In Electromagnetics Research, Vol. 114, 211-234, 2011
doi:10.2528/PIER11010302
Abstract
Power transformers in service are subjected to a wide variety of electrical, mechanical and thermal stresses capable of producing insulation faults. This type of failure figures amongst the most costly faults in distribution networks since it produces both machine outage and electrical supply interruption. Major research effort has therefore focused on the early detection of faults in the insulating systems of large high voltage power transformers. Although several industrial methods exist for the on-line and off-line monitoring of power transformers, all of them are expensive and complex, and require the use of specific electronic instrumentation. For these reasons, this paper will present the On-Line analysis of transformer leakage flux as an efficient alternative for assessing machine integrity and detecting the presence of insulating failures during their earliest stages. An industrial 400 kVA-20 kV/400V transformer will be used for the experimental study. Very cheap, simple sensors, based on air core coils, will be used to measure the leakage flux of the transformer, and non-destructive tests will also be applied to the machine in order to analyse pre- and post-failure voltages induced in the coils.
Citation
Manes Fernandez Cabanas, Francisco Pedrayes González, Manuel García Melero, Carlos H. Rojas García, Gonzalo Alonso Orcajo, José Manuel Cano Rodríguez, and Joaquín González Norniella, "Insulation Fault Diagnosis in High Voltage Power Transformers by Means of Leakage Flux Analysis," Progress In Electromagnetics Research, Vol. 114, 211-234, 2011.
doi:10.2528/PIER11010302
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