NDLI: Relation between power loss factor and insulation resistance on measuring transformers in on site measurement

Content Provider	IEEE Xplore Digital Library
Author	Nikoloski, L. Minovski, R.
Copyright Year	1994
Description	Author affiliation: Elektrotehnicki Fakultet Skopje, Macedonia Univ., Macedonia (Nikoloski, L.; Minovski, R.)
Abstract	Prophylactic measurements on insulating system of high voltage measuring transformers are of great importance for reliable operation of electrical utilities and for safety of the personnel. These measurements are preferably made on site. For this reason, the High Voltage Laboratory of the Faculty of Electrical Engineering in Skopje, Macedonia, a few years ago began systematic on site measurements on the measuring transformers for voltage level of 110 kV. They are with paper-oil insulation. The following two measuring methods were applied: 1. Power Loss Factor (tg/spl delta/) measurements of the entire insulating system between the high voltage winding and ground; 2. Insulation Resistance measurements between the high voltage winding and ground. Both measuring methods have difficulties for on site application. The main reason is the very small capacitance of the measured objects and the presence of strong electrostatic interference from the high voltage conductors in the vicinity of measuring arrangement. This problem is solved in both measuring methods. The measuring technique used is fully described. The results obtained with both methods are compared with each other and good correlation is found. The results are very useful for discussing criteria for insulation evaluation.<>
Starting Page	62
Ending Page	65
File Size	330870
Page Count	4
File Format	PDF
ISBN	0780319427
ISSN	1089084X
DOI	10.1109/ELINSL.1994.401467
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-06-05
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electrical resistance measurement Electrostatic measurements Power transformer insulation Electric variables measurement Voltage measurement Capacitance measurement Electric resistance Dielectrics and electrical insulation Power system reliability Electrical safety
Content Type	Text
Resource Type	Article

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