Encontrados 11 documentos, a visualizar página 1 de 2
Application of Park's power components to the differential protection of three-...
Oliveira, L. M. R.; Cardoso, A. J. MarquesThis paper presents a new scheme for power transformers differential protection, in which the concept of the Park's instantaneous differential powers is introduced. The proposed method is able to detect winding insulation failures and to distinguish them from magnetizing inrush current transients. Experimental and simulation results are presented and discussed.
Power transformers winding fault diagnosis by the on-load exciting current exte...
Oliveira, L. M. R.; Cardoso, A. J. Marques; Cruz, S. M. A.This paper presents the application of the on-load exciting current Extended Park's Vector Approach to diagnose incipient turn-to-turn winding faults in operating power transformers. Experimental and simulation test results demonstrate the effectiveness of the proposed technique, which is based on the spectral analysis of the AC component of the on-load exciting current Park's Vector modulus.
Power transformers behavior under the occurrence of inrush currents and turn-to...
Oliveira, L. M. R.; Cardoso, A. J. MarquesThis paper intends to provide a detailed characterization of the transformer behavior under the influence of inrush currents and/or incipient winding faults. Experimental and simulation results are presented and discussed. Finally, a promising new method to identify inrush currents, and to distinguish them from internal faults, is suggested.
A permeance-based transformer model and its application to winding interturn ar...
Oliveira, L. M. R.; Cardoso, A. J. MarquesThis paper investigates the behavior of power transformers under the occurrence of permanent or intermittent winding insulation faults.
Intermittent turn-to-turn winding faults diagnosis in power transformers by the...
Oliveira, L. M. R.; Cardoso, A. J. MarquesThis paper presents the application of the on-load exciting current Park's vector approach for diagnosing permanent and intermittent turn-to-turn winding faults in operating power transformers. A digital model for the simulation of the behavior of three-phase transformers affected by the presence of winding faults is also proposed. Experimental and simulated results demonstrate the effectiveness of the proposed...
A simple ESR identification methodology for electrolytic capacitors condition m...
Leite, V.; Teixeira, H.; Cardoso, A.J. Marques; Araújo, R.Electrolytic capacitors are usually used in power electronic systems for smoothing, energy storage or filtering. They have the best overall performance for these objectives being a critical element in the design of these systems, in several applications, with different requirements. But, unfortunately, in most cases, they are the most life-limiting device. The expected life of electrolytic capacitors depends on...
DSP implementation of the multiple reference frames theory for the diagnosis of...
Cruz, Sérgio M. A.; Toliyat, Hamid A.; Cardoso, A. J. MarquesThis paper deals with the use of a new diagnostic technique based on the multiple reference frames theory for the diagnosis of stator winding faults in a direct-torque-controlled (DTC) induction motor drive. The theoretical aspects underlying the use of this diagnostic technique are presented but a major emphasis is given to the integration of the diagnostic system into the digital-signal-processor (DSP) board ...
On-line diagnostics of transformer winding insulation failures, by Park`s vecto...
Oliveira, L. M. R.; Cardoso, A. J. MarquesThis paper presents a non-invasive approach for diagnosing winding insulation failures in three-phase transformers, which is based on the on-line monitoring of the primary and secondary current Park's Vector. Experimental and simulated results demonstrate the effectiveness of the proposed technique, for detecting winding inter-turn insulation faults in operating three-phase transformers.
A coupled electromagnetic transformer model for the analysis of winding inter-t...
Oliveira, L. M. R.; Cardoso, A. J. MarquesThis paper presents the development and implementation of a coupled electromagnetic transformer model for the simulation of three-phase power and distribution transformers affected by the presence of winding inter-turn short-circuits. Generically, the coupled electromagnetic transformer model is based on the simultaneous consideration of both magnetic and electric equivalent circuits. To incorporate the interna...
On-line diagnostics of transformer winding insulation failures, by Park's Vecto...
Oliveira, L. M. R.; Cardoso, A. J. MarquesThis paper presents a non-invasive approach for diagnosing winding insulation failures in three-phase transformers, which is based on the on-line monitoring of the primary and secondary current Park's Vector. Experimental and simulated results demonstrate the effectiveness of the proposed technique, for detecting winding inter-turn insulation faults in operating three-phase transformers.
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