Στιγμιαία Τιμή Της Τάσης Έναρξης Και Της Τάσης Περαίωσης Των Μερικών Εκκενώσεων Στον Συνδιασμό "pertimax - Λάδι Μετασχηματιστών" Υπο Κρουστικές Τάσεις +-1,2/100μs Εντός Ανομοιογενούς Πεδίου

Abstract

The examination of the electronic attribute, the ageing and the degradation of electrical insulation material within insulating oil, has been extensively investigated due to their excessive use in the industrial sector This thesis analyses the results of measurements which have been held in conjunction «Pertimax-oil transformers» applying impulse voltage ± 1,2 / 100 κs in a heterogeneous field.The first introductory part, describes the main properties of industrial electrical insulation materials, their evaluation criteria and their division according to their physical condition. Additionally, this study presents the types of strain and perforation. Finally, in the same chapter, the macroscopic theory and the quantum mechanics theory are presented. The methodology of these two theories is used for the interpretation of the results. The theory of this first part is based on the book "Application of Building - Industrial Research and Installation" by P. Mpourkas, Professor in the National Technical University of Athens.The second part refers to the purpose of this thesis, describes the procedure of the measurements and defines the measured magnitude and the mathematical fractions used for the results.In the third part, the results of the measurements and the calculated magnitude are presented in tables. All these are illustrated in diagrams as a function to the implicated voltage uk and the intensity of the electric field Ek. Moreover, these diagrams are approached by a mathematical perspectiveFinally, the fourth part is the conclusion of this study. The measurements are analyzed according to the theoretical tools of statistics analysis, the graphs and the phenomena that took place during the experimental procedure.At this point, I would like to thank my supervisor Professor for appointing this thesis to me, and for his invaluable support and contribution during its implementation.This thesis analyses the results of measurements which have been held in conjunction «Pertimax-oil transformers» applying impulse voltage ± 1,2 / 100 ms in a heterogeneous field.