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http://dx.doi.org/10.5207/JIEIE.2010.24.9.150

A Study on the Occurrence Cause of the Zero Sequence Voltage at Tertiary Side of 345[kV] Main Transformer  

Woo, Jung-Wook (한국전력공사 전력연구원)
Kweon, Dong-Jin (한국전력공사 전력연구원)
Publication Information
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers / v.24, no.9, 2010 , pp. 150-158 More about this Journal
Abstract
We had experienced the several system failures which were concerned about zero sequence voltages at the tertiary side of 345[kV] transformers. In this paper, we had considered the zero sequence voltage and its reduction methods at the 345[kV] auto-transformer tertiary. For analysis, we used EMTP(Electro-Magnetic Transients Program). The calculation results by EMTP were compared with the measured data of the field tests. From the calculation and the field tests, we had verified that it is due to pre-saturation characteristics of the potential transformer. So, we had improved its saturation characteristics and applied it at real site. After improvements, we could reduce the zero sequence voltage below the setting level of the relay.
Keywords
EMTP; 345[kV] Auto-Transformer; Potential Transformer; Zero Sequence Voltage;
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