Analysis of vacuum tap changer failures in power and converter transformers and maintenance suggestions
Analysis of vacuum tap changer failures in power and converter transformers and maintenance suggestions
- Author(s): Y. Yuan 1 ; J. Yang 1 ; L. Bao 1 ; W. Zhang 1 ; L. Zhao 1 ; X. Li 1
- DOI: 10.1049/icp.2020.0083
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- Author(s): Y. Yuan 1 ; J. Yang 1 ; L. Bao 1 ; W. Zhang 1 ; L. Zhao 1 ; X. Li 1
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View affiliations
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Affiliations:
1:
Electric Power Research Institute China Southern Grid , Guangzhou, 510080 , China
Source:
The 16th IET International Conference on AC and DC Power Transmission (ACDC 2020),
2021
p.
91 – 99
-
Affiliations:
1:
Electric Power Research Institute China Southern Grid , Guangzhou, 510080 , China
- Conference: The 16th IET International Conference on AC and DC Power Transmission (ACDC 2020)
- DOI: 10.1049/icp.2020.0083
- ISBN: 978-1-83953-330-3
- Location: Online Conference
- Conference date: 02-03 July 2020
- Format: PDF
In this paper, four vacuum tap changer failures in power and converter transformers are investigated. It is shown that oil contamination and arcing of auxiliary contacts are the main reasons for the failures. The protection and recorded fault current waves are analyzed. The three-phase imbalance current rate is proposed for the early warning of tap changer failure due to the delay initiation and activation of differential protection. A magnetic field FEM simulation model is also established to study the effect of tap changer failure on convert transformer, and the failure progress process has been reproduced successfully. Finally, the historical DGA data sets of thousands of vacuum tap changers in a certain region are collected and analyzed. Caution limits of acetylene of vacuum tap changers are obtained. According to the failure analysis and inspections, maintenance suggestions are proposed for the reference of power grid and manufacturers.
Inspec keywords: power transformer testing; arcs (electric); power generation protection; power grids; on load tap changers; power transformer protection; power transformer insulation; fault currents; failure analysis; finite element analysis
Subjects: Transformers and reactors; Gaseous insulation, breakdown and discharges; Finite element analysis; Power system protection; Reliability