DocumentCode
3133751
Title
Improvement of voltage transformers overvoltage problems in MV networks
Author
Janson, K. ; Järvik, J. ; Kütt, L. ; Soosalu, A.
Author_Institution
Dept. of Fundamentals of Electr. Eng. & Electr. Machines, Tallinn Univ. of Technol., Tallinn
fYear
2008
fDate
27-29 Aug. 2008
Firstpage
247
Lastpage
250
Abstract
An investigation conducted almost 10 years ago revealed that one of the causes for transformer breakdown was ferroresonance effects. As a result a new specification for the voltage transformers was issued by Estonian Power Company. Now the first of transformers with improved characteristics have been in service for years, any further breakdowns have been experienced. This paper looks at the improvements to the specifications that leaded to the improvement of the voltage transformers reliability.
Keywords
overvoltage protection; power transformers; reliability; ferroresonance effects; voltage transformers overvoltage problems; voltage transformers reliability; Capacitance; Circuit faults; Earth; Ferroresonance; Magnetic cores; Medium voltage; Power transformers; Saturation magnetization; Voltage control; Voltage transformers;
fLanguage
English
Publisher
ieee
Conference_Titel
Power Quality and Supply Reliability Conference, 2008. PQ 2008
Conference_Location
Parnu
Print_ISBN
978-1-4244-2500-6
Electronic_ISBN
978-1-4244-2501-3
Type
conf
DOI
10.1109/PQ.2008.4653769
Filename
4653769
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