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- Parameters determination for the coupled electromagnetic transformer model, with particular reference to winding faults studiesPublication . Oliveira, L. M. R.; Cardoso, A. J. MarquesIn the past few years, a considerable research effort has been devoted to the development of transformer digital models in order to simulate its behaviour under transient and abnormal operating conditions. Although many three-phase transformer models have been presented in the literature, there is a surprisingly lack of studies regarding the incorporation of winding faults. This paper presents a coupled electromagnetic transformer model for the study of winding inter-turn short-circuits. Particular attention will be given to the model parameters determination, for both healthy and faulty operating conditions. Experimental and simulation test results are presented in the paper, demonstrating the adequacy of the model as well as the methodologies for the parameters determination.
- A coupled electromagnetic transformer model for the analysis of winding inter-turn short-circuitsPublication . 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 internal faults in this model a suitable equivalent circuit of the faulty winding is proposed. Both simulation and laboratory tests results are presented in the paper, which demonstrate the adequacy of the proposed model.
- On-line diagnostics of transformer winding insulation failures, by Park`s vector approachPublication . 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.
- Incipient turn-to-turn winding fault diagnosis of power transformers by the on-load exciting current Extended Park`s Vector ApproachPublication . Oliveira, L. M. R.; Cardoso, A. J. MarquesThis paper presents the application of the on-load exciting current Extended Park's Vector Approach for diagnosing incipient turn-to-turn winding faults in operating power transformers. Experimental and simulated 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.
- Detection of trasformer intermittent winding faults by the on-load exciting current Park`s vector approachPublication . 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. First, an experimental investigation of the behaviour of the transformer under the occurrence of both permanent and intermittent winding faults is presented. Finally, experimental test results demonstrate the effectiveness of the proposed diagnostic technique, which is based on the on-line monitoring of the on-load exciting current Park's Vector patterns.
- On-line diagnostics of transformer winding insulation failures, by Park's Vector ApproachPublication . 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.
- Three-phase, three-limb, steady-state transformer modelPublication . Oliveira, L. M. R.; Cardoso, A. J. MarquesThis paper presents the development and implementation of a digital simulation model of a threephase, three-leg, three-winding power transformer. The proposed model, implemented in MATLAB environment, is based on the simultaneous analysis of both magnetic and electric lumped-parameters equivalents circuits, and it is intended to study its adequacy to incorporate, at a later stage, the influences of the occurrence of windings interturn short-circuit faults. Both simulation and laboratory tests results, obtained so far, for a three-phase, 6 kVA transformer, demonstrate the adequacy of the model under normal operating conditions.
- Intermittent turn-to-turn winding faults diagnosis in power transformers by the on-load exciting current Park's Vector ApproachPublication . 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 diagnostic technique, which is based on the on-line monitoring of the on-load exciting current Park's Vector patterns.
- Transformers on-load exciting current Park`s vector approach as a tool for winding faults diagnosticsPublication . Oliveira, L. M. R.; Cardoso, A. J. Marques; Cruz, S. M. A.This paper presents the development of a new approach for diagnosing the occurrence of inter-turn short-circuits in the windings of three-phase transformers, which is based on the on-line monitoring of the on-load exciting current Park's Vector patterns. Experimental and simulated results demonstrate the effectiveness of the proposed technique for detecting winding inter-turn insulation faults in operating three-phase transformers.