Characteristics and Mechanism of Bubble Initiation in Transformer Oil
Induced by Vibration
- Chong Guo,
- Qiaogen Zhang,
- Junjie Zhou,
- Shaoqi Wang,
- Yunhan Sun,
- Zhetao Zhang
Chong Guo
Xi'an Jiaotong University School of Electrical Engineering
Author ProfileJunjie Zhou
Xi'an Jiaotong University School of Electrical Engineering
Author ProfileShaoqi Wang
Xi'an Jiaotong University School of Electrical Engineering
Author ProfileYunhan Sun
Xi'an Jiaotong University School of Electrical Engineering
Author ProfileZhetao Zhang
Xi'an Jiaotong University School of Electrical Engineering
Author ProfileAbstract
Operating experience has shown that vibration can cause pressure
fluctuations and initiate bubbles at the oil gap, which seriously
threatens the insulation properties of oil-immersed power equipment. The
main aim of this study was to determine the characteristics and
mechanism of bubble initiation at the transformer oil gap under
vibration in this paper. The results show the existence of the
vibration-dependent bubbling phenomenon at the oil gap. Interestingly,
bubbles initiate during the process of gap expansion, and the evolution
of bubble morphology was further analyzed. The threshold characteristic
of the bubble initiation process was found, and the relevant influencing
factors were experimentally obtained. In the range considered in this
study, higher gas content, higher temperature, and lower moisture
content are conducive to bubble initiation at the oil gap under
vibration, while vibrational frequency does not affect the threshold
characteristic of bubble initiation process. The vibration-dependent
bubbling phenomenon can be attributed to the vibration-induced
cavitation process caused by the decrease in pressure at the oil gap.
The influence mechanism of the above factors on the threshold
characteristics of bubble initiation was further discussed. This study
contributes to providing a reference for risk assessment of abnormal
vibration of oil-immersed power equipment.25 Apr 2023Submitted to IET Generation, Transmission & Distribution 27 Apr 2023Submission Checks Completed
27 Apr 2023Assigned to Editor
02 May 2023Reviewer(s) Assigned
21 May 2023Review(s) Completed, Editorial Evaluation Pending
23 May 2023Editorial Decision: Revise Major
09 Jun 20231st Revision Received
10 Jun 2023Submission Checks Completed
10 Jun 2023Assigned to Editor
11 Jun 2023Reviewer(s) Assigned
19 Jun 2023Review(s) Completed, Editorial Evaluation Pending
19 Jun 2023Editorial Decision: Accept