ANALYSIS OF IONIC IMPURITIES IN ELECTRICAL ROTATING MACHINES INSULATORS BY ANALYTICAL TECHNIQUES

The insulation used in electrical rotating machines is a major component that influences their operation parameters. It is therefore essential to identify the methods of investigation and new technological processes to improve quality of the insulation. Traces of transition metals have been found in the insulation of cables PE. These transition metals causes degradation of insulation, affect its insulating properties and can lead to undesired electrochemical processes under the electrical stress factor. Traces of transition metals in insulator can be determined only by means of atomic and nuclear techniques of high sensitivity and precision. In this paper are presented some analytical techniques that can be used in the analysis of insulators in order to establish the most suitable method to determine the concentrations of ionic impurities. By technique Inductively Coupled Plasma Mass Spectrometry – ICP-MS, were identified and quantitative determined in insulator the following chemical elements: Cu, Pb, Zn, Cr, Cd, Al, Ni, Co, Fe and Mn.

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