Field Vibration Feature and Related Factors Analysis of 110kV Transformers

Abstract Transformer vibration is closely related with its operating condition. In order to realize transformer operation condition evaluation, vibrations of sixty-two 110kV transformers are tested. The acceleration amplitude, base frequency amplitude, base frequency ratio, dominant frequency amplitude, dominant frequency ratio and frequency complexity are chosen as vibration features. Statistical analysis of the feature distribution is conducted to determine the normal range of the vibration features. In addition, the influence of operating life on transformer vibration features is also analyzed. The result shows that for most transformers vibration acceleration amplitude, base frequency amplitude, base frequency ratio, dominant frequency amplitude, dominant frequency ratio and frequency complexity are in the range below 5.0m/s2, 1.0m/s2, 0.3, 2.0 m/s2, 0.9 and 3.0, respectively. The vibration amplitude, base frequency and dominant frequency amplitude will increase obviously if transformer operating life is over 20 years. The analysis result will be used as data support for the operation condition assessment of transformers.