Proceedings ArticleDOI
Online assessment of winding deformation based on optimised excitation
S. Gopalakrishna,V. Jayashankar,Kumar V Jagadeesh,N. Madhu Mohan +3 more
- pp 84-89
TLDR
On line assessment of winding deformation in a power transformer can be performed via a bushing tap excitation with optimized high frequency excitation through a benchmark layer winding to validate the suitability of the technique.Abstract:
On line assessment of winding deformation in a power transformer can be performed via a bushing tap excitation with optimized high frequency excitation. A benchmark layer winding is used to validate the use of the specific high frequency excitation. Axial displacement, compression and buckling of the winding are simulated and the changes identified. Measurements are performed on a voltage transformer to verify the suitability of the technique. The procedure will result in a considerably shorter time for measurement.read more
Citations
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Journal ArticleDOI
Current Status and Future Trends in Frequency-Response Analysis With a Transformer in Service
TL;DR: In this article, the authors present the current status and future trends in the application of the frequency response analysis (FRA) technique with the transformer in service (online) through bibliographic review and analysis.
Proceedings ArticleDOI
The application of sweep frequency response analysis for the online monitoring of power transformers
TL;DR: In this article, the authors proposed a technique for in-service monitoring of power transformer winding deformation, which uses a broad frequency sine wave voltage excitation signal and high frequency Current Transformers (CT) in conjunction with the bushings test taps.
Proceedings ArticleDOI
Online monitoring of power transformers using impulse frequency response analysis
TL;DR: In this article, a growing interest in the development of on-line monitoring techniques for smart grid systems is discussed, which is to reduce the maintenance costs as well as minimize the probability of unexpected outages, or potentially to prevent catastrophic failures in the electrical network.
Proceedings ArticleDOI
Winding deformation analysis in power transformers using Finite Element Method
TL;DR: In this paper, Finite Element Method (FEM) and Sweep Frequency Response Analysis (SFRA) are used to model deformation on a benchmark winding and obtain corresponding signatures, which are used as indices to distinguish type and location of deformation.
Proceedings ArticleDOI
Simulation and Analysis of Transformer Winding Inter-disk and Inter-turn Faults for Online Diagnosis
Venera Nurmanova,Roya Ahmadi Ahangar,Kamilla Aliakhmet,Mohammad Salay Naderi,Gevork B. Gharehpetian,Mehdi Bagheri,Toan Phung +6 more
TL;DR: It is revealed that the winding inter-disk and inter-turn faults lead to FRA anti-resonance frequency shift and response magnitude alteration in online FRA.
References
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Journal ArticleDOI
Survey of excitation signals for FFT based signal analyzers
TL;DR: The properties of ten different excitation signals are studied to analyze their suitability as excitation signal for fast Fourier transform (FFT)-based signal and network analyzers and the flexibility to create a customized amplitude spectrum is investigated.
Journal ArticleDOI
Procedures for detecting winding displacements in power transformers by the transfer function method
J. Christian,K. Feser +1 more
TL;DR: In this article, three different ways of using the transfer function method for detecting mechanical winding displacements in power transformers are investigated, and the most reliable approach is time-based comparison, which requires finger print data from a previous measurement.
Journal ArticleDOI
A general method for determining resonances in transformer windings
TL;DR: In this article, the authors present a method for calculating terminal and internal impedance versus frequency for a lumped parameter model of a transformer, where the transformer's total frequency response can be accurately determined from this impedance data directly, i.e., the terminal resonance and anti-resonance and internal amplification factor characteristic can be calculated for a single or three-phase transformer model.
Journal ArticleDOI
Application of numerical evaluation techniques for interpreting frequency response measurements in power transformers
TL;DR: In this paper, the authors discuss numerical-criteria-based evaluation techniques for frequency response analysis (FRA) for verifying the mechanical integrity of power transformers and conclude that if original fingerprints are available, the method gives very reliable indication for diagnosing the faulty winding.
Journal ArticleDOI
Apparatus for Online Power Transformer Winding Monitoring Using Bushing Tap Injection
TL;DR: In this paper, 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 short bushing-tap short and allow online operation of the system is demonstrated on a 650 kV transformer.