Condition monitoring and diagnostics of power transformers

This paper addresses the subject of condition monitoring and diagnostics of power transformers. The main results of two reliability surveys, carried out under the auspices of CIGRE and IEEE in order to assemble objective data on the performance of transformers in service, are presented, providing useful information on the main causes of transformer failures, the most likely affected components and the related outages times. A survey of the most important methods, actually in use, for condition monitoring and diagnostics of power transformers is also given, which stresses the need for the development of new diagnostic methods, that can be applied without taking the transformers out of service, and that can also provide a fault severity criteria, in particular for determining transformers windings integrity. Preliminary results, concerning the on-going research activity on the development of a new approach for inter-turn winding fault diagnosis in three-phase transformers, are also reported in the paper.

Condition monitoring and diagnostics of power transformers

This paper addresses the subject of condition monitoring and diagnostics of power transformers. The main results of two reliability surveys, carried out under the auspices of CIGRE and IEEE in order to assemble objective data on the performance of transformers in service, are presented, providing useful information on the main causes of transformer failures, the most likely affected components and the related outages times. A survey of the most important methods, actually in use, for condition monitoring and diagnostics of power transformers is also given, which stresses the need for the development of new diagnostic methods, that can be applied without taking the transformers out of service, and that can also provide a fault severity criteria, in particular for determining transformers windings integrity. Preliminary results, concerning the on-going research activity on the development of a new approach for inter-turn winding fault diagnosis in three-phase transformers, are also reported in the paper.

Seasonal variations in gross biochemical composition, percent edibility, and condition index of the clam Ruditapes Decussatus cultivated in the Ria Formosa (South Portugal)

The grooved carpet shell clam, Ruditapes decussatus (L. 1758), is one of the most popular and profitable molluscs exploited in rearing plots in the Mediterranean. However, annual catch has been declining steadily since the early nineties. In order to understand the seasonality of its nutritional value, thus providing an improved basis for economical valuation of the resource, gross biochemical composition, percentage edibility and condition index were investigated during a year with monthly periodicity in a commercially exploited population of the clam Ruditapes decussatus in the Ria Formosa, a temperate mesotidal coastal lagoon located in the south of Portugal. Our results show that total and non-protein nitrogen co-varied during the year, resulting in a protein content that peaked in the warmest months. Although complementary in summer, carbohydrate and lipid contents showed irregular annual trends. The observed seasonality was comparable to that shown by studies elsewhere at similar latitudes, and are underpinned by the reproductive cycle of the species. Our results show the clams to be at their prime nutritional value at the beginning of summer, when protein content peaks.

Some questions of condition monitoring of turbopropengine transmission

The mathematical model of the transmission of the turbine engine was made ... (texto em russo)

Le mensonge qui imitait la verité: entre une ethique artistique et une ethique de vie

Ce mémoire création porte sur un apprentissage de deux ans sur les comportements scéniques de l'acteur et sur une approche théâtrale où l'éthique, l'esthétique et les techniques s’inspirent de l'authenticité de l'interprétation. Ce mémoire présente des réflexions sur une pratique théâtrale perçue à partir de quatre vocables du lexique de cette conception théâtrale: la confidentialité, le mensonge, l'effet et les monstres. Ce mémoire est composé de trois chapitres. Le premier chapitre expose ma vision du théâtre avant de préparer la maitrise, puis souligne en quoi ma vision du théâtre et ma vision de la vie ont pu être influencées par ma première année d'étude. J'établis également un lien entre ces deux conceptions entièrement différentes. Dans le deuxième chapitre, j'expose la genèse qui nous a amenés à la création de Gogo e Didi: Cantata com prelúdio e fugas. J'y décris notre spectacle et j'expose le sens que nous attribuons au texte. Ce mémoire se conçoit et se comprend donc comme un outil d'accompagnement à la création de notre représentation et est aussi le témoignage de ce que nous avons acquis pendant ces deux années d'études. Le côté pratique de notre apprentissage est décrit dans le troisième chapitre autour des quatre vocables mentionnés. J'y définirai ces quatre termes et je ferai un lien avec nos explorations pratiques. N'ayant pas pour sujet principal la formation d'acteurs, cette étude permet de mieux cerner une conception théâtrale basée sur l'authenticité, à travers mon expérience et une réflexion personnelle où je démontre que la pédagogie du «faire» permet de mieux comprendre les difficultés et les différents comportements scéniques de l'acteur.