Title :
Assessment of insulation condition of 130 kV oil-paper current transformers using return voltage measurements and an expert system
Author :
Krivda, A. ; Neimanis, R. ; Gubanski, S.M.
Author_Institution :
Vattenfall Utveckling, Stockholm, Sweden
Abstract :
An automated pattern recognition system for the assessment of insulation condition of 130 kV oil-paper current transformers has been developed. The system uses polarisation spectra as obtained by return voltage measurements to estimate the state of high voltage (HV) insulation. Preliminary results show that the system is very reliable, decisions are reached within few seconds and the results fully agree with tan δ measurements upon which previous estimates of insulation degradation were based. Moreover, return voltage measurements are easy to apply, offer robust performance in field environment and the equipment is less bulky
Keywords :
composite insulating materials; current transformers; diagnostic expert systems; dielectric polarisation; insulation testing; paper; pattern recognition; power transformer insulation; power transformer testing; transformer oil; voltage measurement; 130 kV; automated pattern recognition; expert system; high voltage insulation diagnostics; oil-paper current transformer; polarisation spectra; return voltage measurement; Current transformers; Dielectric measurements; Electric variables measurement; Loss measurement; Oil insulation; Partial discharge measurement; Polarization; Power transformer insulation; Time measurement; Voltage measurement;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1997. IEEE 1997 Annual Report., Conference on
Conference_Location :
Minneapolis, MN
Print_ISBN :
0-7803-3851-0
DOI :
10.1109/CEIDP.1997.634596
