Analysis and Countermeasures of Value Side Bushing Fault of Converter Transformer in Gezhouba to Nanqiao HVDC Transmission Project

Abstract:

Converter transformer is one of the most important equipments of UHVDC power transmission system, its faults directly affects the safe and stable operation of DC system. The valve winding of converter transformer needs to withstand the voltage that consist of DC voltage and serious distortion of AC voltages (harmonic bound) which are similar to the AC sine waveform compound voltage, so in the design and manufacture of the valve side of converter transformer, bushing is much more complex and difficult than alternating current casing.Valve bushing is weak spot of converter transformer insulation. Through the anatomy of failure bushing, the reason of bushing failure is analyzed. Without changing body size of the converter transformer, the bushing of new structure is developed and the old bushing is replaced to improve the reliability of equipment operation.

• Periodical: Applied Mechanics and Materials (Volumes 672-674)
• Pages: 870-876
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.672-674.870
• Online since: October 2014
• Authors: Yue Hua Huang, Li Hua Hu*, Jia Wei Li, Hai Fan Xia
• Keywords: Converter Transformer, Fault Analysis, HVDC, Improvement Measure, Value Side Bushing

References

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