Apparatus for Online Power Transformer Winding Monitoring Using Bushing Tap Injection

Online transformer condition monitoring techniques based on transfer function methods, such as transmission-line diagnostics and swept frequency-response analysis, require the injection of a known test signal into the transformer. On larger power transformers, a practical method is to use the availa...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2009-07, Vol.24 (3), p.996-1003
Main Authors: De Rybel, T., Singh, A., Vandermaar, J.A., Wang, M., Marti, J.R., Srivastava, K.D.
Format: Article
Language:English
Subjects:
Applied sciences
Bushing tap injection
Bushings
Circuits
Condition monitoring
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
Frequency measurement
frequency response
frequency-response analysis (FRA)
High voltage or high current generators
Insulators
Joints
Monitoring
On-line systems
Online
online diagnostics
Power electronics, power supplies
Power networks and lines
Power system transients
Power transformers
Shape measurement
Signal analysis
Signal generators
swept frequency-response analysis (SFRA)
Testing
Transfer functions
Transformers
Transformers and inductors
Transmission lines
transmission-line diagnostics (TLD)
Users connections and in door installation
Various equipment and components
winding signature
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Summary:Online transformer condition monitoring techniques based on transfer function methods, such as transmission-line diagnostics and swept frequency-response analysis, require the injection of a known test signal into the transformer. On larger power transformers, a practical method is to use the available bushing tap connection. In this paper, we will discuss a custom high-power signal generator that injects high-frequency signals on the bushing tap of the transformer under investigation, as well as a circuit to replace the bushing tap short and allow online operation of the system. Finally, the system is demonstrated on a 650 kV transformer.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2009.2022674