2,393 research outputs found
On the Identification of Insulation Defects Supporting Partial Discharges
No full textThe identification of defects supporting Partial Discharge (PD) phenomena in insulation systems of HV machines and components, is a fundamental requirement of any diagnostic procedure because different defect typologies can affect in different ways the insulation reliability. Once a defect is correctly identified, it can be monitored and a repair action can be planned to prevent catastrophic failures. An effective identification requires specific definitions, algorithms and validation procedures. An identification method based on the organization of robust markers in a tree-structure, is presented in this paper. Some examples are discussed to show its advantages/limitations in the perspectives of a possible future development of fully automated diagnostic procedures and smart instruments
New Perspectives in Diagnostics with Partial Discharges
No full textA review of definitions, algorithms and validation procedures relevant to the identification of defects supporting Partial Discharges (PD) and separation of mixed pulse-signals which are the main steps of diagnostic of insulation systems based on PD measurements, are presented in this paper. The fundamental requirements to obtain valid insulation diagnosis and avoid misleading evaluations of the defects generating PD, are discussed considering also a possible future development of fully automated diagnostics and smart instruments. This presentation summarize the current investigations conducted by the Research Unit of the Dielectric Materials Lab. of the University of Trieste (Italy)
Sulla Diagnostica dei Sistemi Isolanti con le Scariche Parziali Parte I: L’Identificazione dei Difetti
No full textIn questo articolo viene presentato un nuovo approccio alla diagnostica degli isolamenti mediante l’analisi delle scariche parziali. Le diverse fasi della procedura sono presentate in modo coerente per giungere alla corretta identificazione del componente difettoso e dell’affidabilità del sistema isolant
Sulla Diagnostica dei Sistemi Isolanti con le Scariche Parziali Parte II: Il Rumore, La Separazione, La Strumentazione e le Modalità di Prova
No full textIn questo articolo viene presentato un nuovo approccio alla diagnostica degli isolamenti mediante l’analisi delle scariche parziali. Le diverse fasi della procedura sono presentate in modo coerente per giungere alla corretta identificazione del componente difettoso e dell’affidabilità del sistema isolant
Diagnostics of Insulation Systems by Means of Partial Discharges
No full textThe fundamental requirements of a diagnostic procedure composed by defect identification, noise and disturbance rejection, separation of multiple sources, set-up conditions and test prescriptions, are described in this paper. This procedure allows to overcome problems found when practical objects are tested using the apparent charge measurement approach according to Std.IEC 60270. Definitions, methodologies and validation procedures relevant to the different diagnostic steps, are presented and discussed considering also a possible future development of fully automated instruments
A Fuzzy Inference System, Based on PD Measurements, for Defect Identification in Rotating Machines
No full textAn Algorithm, Based on the Auto-Correlation Function Evaluation, for the Separation of Partial Discharge Signals
No full textCaratterizzazione di Sistemi Isolanti Solidi Attraverso la Misura e l'Analisi delle Distribuzioni d'Ampiezza delle Scariche Parziali
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