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2013 (Vol. 6, Issue: 20)
Article Information:

Research on Frozen Soil Structure Influence over Transformer DC Magnetic Biasing in UHVDC Transmission

Yang Yongming, Liu Xingmou and Yang Fan
Corresponding Author:  Yang Yongming 

Key words:  Ground electrode, hvdc, soil structure, transformer dc bias, , ,
Vol. 6 , (20): 3741-3745
Submitted Accepted Published
January 02, 2013 February 08, 2013 November 10, 2013

This study studies the exciting current of transformer affected by DC bias in the Tibet frozen soil structure when the UHVDC system is working in monopole state. Firstly, the model of calculating the ground potential for a typical frozen soil of the Tuotuo River substation was described and then the ground potential around the UHVDC grounding electrode for five-layer soil in summer and winter was calculated. According to the soil parameters, the magnetic bias current of the transformer were calculated. Results indicate that the distance is less than about 4 km and the earth potential is variable in different season. The substation electrode design parameters are complex, so building substation is very inconvenient. And when the distance is adjusted from 4 km to 8km, the earth potential is changed from 400 to 200 V, the exciting current decreased from 45 to 5 mA, the waveform unbalance will also decrease.
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  Cite this Reference:
Yang Yongming, Liu Xingmou and Yang Fan, 2013. Research on Frozen Soil Structure Influence over Transformer DC Magnetic Biasing in UHVDC Transmission.  Research Journal of Applied Sciences, Engineering and Technology, 6(20): 3741-3745.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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