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
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;
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
DOI :
10.1109/PQ.2008.4653769
