Abstract
This paper analyzes the relationship between vibration characteristics of ultra-high voltage (UHV) transformer and DC bias current. The main source of UHV transformer's no-load vibration is the magneto-strictive vibration of the magnetic core. However, unlike the small power transformer, the characteristic of large inductance to small resistance of UHV transformer which can easily lead to not only a long transient process but also the calculation error due to the small DC voltage compared to the 1000 kV AC voltage. Thereby, a fast solution called series resistance and voltage compensation method (SRVCM) is utilized to shorten the transient process. By means of SRVCM, the vibration displacement, acceleration and its harmonics under different DC bias are calculated by a weak magneto-mechanical coupling model. The DC bias experiment of two identical 250MVA/500kV transformer with no load is carried out, and the calculated and measured vibration acceleration are compared.
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