Title :
Detection of oil-paper equilibrium moisture content in power transformers using hybrid intelligent interpretation of polarisation spectrums from recovery voltage measurements
Author :
Islam, Syed M. ; Jota, Patricia R S ; Stace, Mark
Author_Institution :
Sch. of Electr. & Comput. Eng., Curtin Univ. of Technol., Perth, WA, Australia
Abstract :
Detection of moisture in oil and paper is a key factor in determining the health of insulation in a power transformer. High moisture content severely degrades the insulating strength of oil and paper and may eventually cause failure. It is therefore highly desirable to detect incipient failure. Recently, a method based on Recovery Voltage Measurement (RVM) on transformers has been successfully used by Pacific Power International in the Australian state of New South Wales to identify conditions such as contaminated bushings, traces of solvent in oil, effectiveness of vacuum dry out and treatment of oil, local moisture ingress, and presence of static charges in oil. A Matlab based hybrid Expert System-Neural Network software has been developed to interpret above conditions from measured RVM data on 60 (sixty) power transformers. In this paper, details of this non-destructive and non-intrusive technique and some interesting results are presented
Keywords :
bushings; condition monitoring; diagnostic expert systems; dielectric polarisation; electric strength; impregnated insulation; insulation testing; insulator contamination; moisture measurement; neural nets; paper; power engineering computing; power transformer insulation; power transformer testing; transformer oil; voltage measurement; Matlab based hybrid expert system-neural network software; Pacific Power International; condition monitoring tool; contaminated bushings; hybrid intelligent interpretation; incipient failure detection; insulating strength; insulation health; local moisture ingress; nondestructive nonintrusive technique; oil-paper equilibrium moisture content detection; polarisation spectrum; power transformers; recovery voltage measurements; solvent traces; static charges; vacuum dry out; Australia; Degradation; Insulators; Moisture; Oil insulation; Petroleum; Power transformer insulation; Power transformers; Solvents; Voltage measurement;
Conference_Titel :
Electrical Insulation, 1998. Conference Record of the 1998 IEEE International Symposium on
Conference_Location :
Arlington, VA
Print_ISBN :
0-7803-4927-X
DOI :
10.1109/ELINSL.1998.704638
