Journal ArticleDOI
Virtual Instrument for Lightning Impulse Tests
A. Palani,V. Jayashankar +1 more
TLDR
In this paper, an objective formulation of the impulse analysis problem from a signal analysis viewpoint is proposed, where the winding response is quintessentially that of a deterministic network to a finite energy signal, with breakdown and partial discharge being inherently nonlinear events.Abstract:
We propose an objective formulation of the impulse analysis problem from a signal analysis viewpoint. The winding response is quintessentially that of a deterministic network to a finite energy signal, with breakdown and partial discharge being inherently nonlinear events. A significant improvement to the acquisition of waveforms is demonstrated by a virtual instrument approach. It retains the advantages of the time- and frequency-domain methods. The drawbacks of the transfer function method are highlighted and a new piecewise linear approach is proposed for analysis. Experiments on a discrete lumped parameter model of the winding are used to validate the PXI based instrument.read more
Citations
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Journal ArticleDOI
Frequency domain correlation technique for PD location in transformer winding
V. Jeyabalan,S. Usa +1 more
TL;DR: In this article, the limitation of time domain correlation method in locating partial discharge (PD) in transformer windings is found out, and frequency domain correlation with Gram Schmidt orthogonalization is proposed.
Journal ArticleDOI
Real-Time Techniques to Measure Winding Displacement in Transformers During Short-Circuit Tests
TL;DR: In this article, the authors propose new techniques for fault detection based on continual assessment during the test. They include voltage comparison, current comparison, and real/reactive power measurements, which are validated on a number of models including a voltage transformer and a distribution transformer winding.
Journal ArticleDOI
Comparison of Impulse Wave and Sweep Frequency Response Analysis Methods for Diagnosis of Transformer Winding Faults
Qing Yang,Peiyu Su,Yong Chen +2 more
TL;DR: In this paper, a tapped transformer is designed and test platforms are built to compare winding diagnoses using the impulse wave and sweep frequency response analysis methods by recording voltage responses on both the high and low-voltage sides and calculating the respective transfer functions.
Journal ArticleDOI
A technique based on an archimedean copula for the localization of partial discharge in a transformer winding
Mithun Mondal,G. B. Kumbhar +1 more
TL;DR: A technique based on an Archimedean copula is proposed to find the location of a Partial Discharge source in a transformer winding and demonstrates that the proposed approach is capable of achieving an accurate prediction of the locations of the PD source.
Journal ArticleDOI
Statistical Techniques for Partial-Discharge Location in Transformer Windings
V. Jeyabalan,U. Usa +1 more
TL;DR: In this article, statistical techniques are used to locate the partial discharge in transformer windings, and the experimental studies are performed on a 22-kV prototype interleaved winding to prove the feasibility of the methods.
References
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Journal ArticleDOI
Impulse testing of power transformers using the transfer function method
Ryszard Malewski,B. Poulin +1 more
TL;DR: In this article, the transfer function of a transformer winding is deconvoluted in the frequency domain from the digitally recorded neutral current and high voltage applied during impulse tests, and the integrity of the winding insulation is determined by comparing the transferred function obtained at full and reduced test voltage.
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.
Book
Analog signal processing
TL;DR: This book discusses signals and Signal Processing, including AC/DC Signal Conversion, Analog Signal Switching, Multiplexing and Sampling, and more.
Journal ArticleDOI
Transformer model for high frequencies
TL;DR: In this paper, a method for the development of a high-frequency transformer model for use in an electromagnetic transient program (EMTP) is discussed, and the results are used to calculate the transfer and admittance functions.
Journal ArticleDOI
Multiresolution signal decomposition: a new tool for fault detection in power transformers during impulse tests
Santosh Pandey,L. Satish +1 more
TL;DR: In this paper, the authors proposed a new and powerful method capable of detecting minor incipient faults in power transformers based on dyadic-orthonormal wavelet transform analysis, which decomposes a given faulty neutral current response into other signals which represent a smoothed and detailed version of the original.
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