NDLI: A novel method to on-line measuring of power factor (tan /spl delta/) and capacitance of transformers' bushings

Content Provider	IEEE Xplore Digital Library
Author	Setayeshmehr, A. Akbari, A. Borsi, H. Gockenbach, E.
Copyright Year	2005
Description	Author affiliation: Div. of High Voltage Eng., Hannover Univ., Germany (Setayeshmehr, A.; Akbari, A.; Borsi, H.; Gockenbach, E.)
Abstract	Power transformers are one of the most important and expensive components in electric energy networks. The majority of them have been in service for many years under different environmental, electrical, and mechanical conditions. To extend transformers life as long as possible and prevent failures, predicting diagnostic methods and condition monitoring systems are used. Statistical studies have shown that failures of bushings are one of the main causes for long duration outages of transformers. The development of an instrument for supervising the conditions of transformers' bushings is, therefore, of special interest. Values of power factor (tan /spl delta/) and capacitance (PF&C) of bushings are the best indicators of the bushing's condition. Using two sensors that are installed around the bushing's surface, it is possible to obtain two on line signals. The first signal shows the bushing's condition and the second signal can be used as a reference voltage. A bushing monitoring and diagnostic system is introduced. The system consists of hardware and software. The hardware performs four functions: filtering, amplifying, converting obtained signal to digital, and storing the result in computer. The software compares the amplitude and phase difference of two signals to determine the probable difference in PF&C of each bushing.
Starting Page	289
Ending Page	292
File Size	707868
Page Count	4
File Format	PDF
ISBN	0780389549
DOI	10.1109/ICDL.2005.1490083
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-26
Publisher Place	Portugal
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Capacitance measurement Power measurement Reactive power Insulators Hardware Power transformers Condition monitoring Instruments Voltage Computerized monitoring
Content Type	Text
Resource Type	Article

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