INSULATION RESISTANCE TESTING OF THE MEDIUM VOLTAGE SWITCHES
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2010, Vol 34, Issue 34
Abstract
This paper refers, in general, to the problem of off-line diagnosis of automated switches, and in particular it refers to the testing procedures regarding the insulation resistance. The factors that have a negative influence upon the insulation resistance will be analyzed as well as the principles of the measurement of the insulation resistance. The testing procedures, which are defined in standards, are applied to the extinguishing chamber of a medium-voltage circuit breaker, IUP-M. Through the process software Tera-Link, the tester used for experimental determinations Metrel MI 3200 TeraOhm 10kV emphasis the insulation resistance parameters of the tested equipment. The Metrel MI 3200 TeraOhm 10kV equipment, from the Electrical Equipment lab of the Technical University in Cluj-Napoca, allows taking the following tests and determinations for the electrical equipments insulation: determining the insulation resistance through the “spot reading” method, determining the „polarization index” (PI), through the „absorption test” procedure, determining the „dielectric absorption ratio” (DAR), the possibility of taking the dielectric discharge test and the possibility of measuring the insulation resistance tests with step voltage method. It is very interesting to notice the facility of portable equipment of the MI 3200 tester, the fast completion of the testing operations and the ease in interpreting results with Tera-link software.
Authors and Affiliations
Horia BĂLAN, Mircea BUZDUGAN, Radu MUNTEANU, Aurel BOTEZAN, Ioan COZORICI, Valer AVRAM
Keywords
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