The application of sweep frequency response analysis for the online monitoring of power transformers

Rahimpour, Hossein; Mitchell, Stephen G.; Tusek, Joe

doi:10.1109/aupec.2016.7749347

Cited by 14 publications

(4 citation statements)

References 7 publications

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“…Therefore, proper monitoring of transformers is very much essential with good and regular maintenance [25], [26]. In case of fault detection and reduction of unusual power transformers plays an important role in power system It is also important to detect the operating characteristics of transformer with repeat to desired time as well as the reliability of the equipment.…”

Section: Energymentioning

confidence: 99%

Optimal Design of Power Transformer with Advance Core Material using ANSYS Technique

Urooj

Singh

Amir

et al. 2020

EJECE

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Due to indulge behavior of core materials and losses that leads to degradation of transformer efficiency. This research paper evaluating the optimal performance of transformer with designing of a newly core material namely as Mo.Me6. A possibility of increment in the efficiency for designed proposed model of transformer is observable. Also, a comparative analytical study based on the different designs of core type transformer with various core materials. The design and evaluation are performed on the Maxwell ANSYS electronic desktop platform, which provides an optimized design of transformer for practical applications. Whether it is a power transformer having lower frequency applications use in electronic circuits such as rectifying circuits or higher frequency applications power distribution circuit, etc. All transformer designs require performance evaluation in the working field and better efficiency to optimize the overall three-phase type core transformer. In this paper, proposed Mo.Me6 material with improved physical properties have been present of transformer efficiency and optimal design of core. The criteria include the changes in some effective parameters of the core, bringing out advancement in the working efficiency of the transformer. There is an opportunity to have a choice of desired material as designed particularly for the customer need making it will be more reliable and more suitable for various changeable conditions. For more efficient and effective working of transformer, this paper suggests core design with ANSYS techniques to achieve mentioned high efficiency with lower losses.

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Section: Energymentioning

confidence: 99%

Optimal Design of Power Transformer with Advance Core Material using ANSYS Technique

Urooj

Singh

Amir

et al. 2020

EJECE

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“…According to Ryder [ 16 ], the main advantages of the SFRA in relation to IFRA are the better signal to noise ratio and nearly equal accuracy across the whole measurement range. Furthermore, the work of Rahimpour et al [ 25 ] adds that, with SFRA, there is a reduced need for complex signal processing—as no domain transformations, such as FFT or wavelets, are required. However, for online applications, the low voltage signal generator responsible for the frequency sweep has to be connected to the energized machine through some sort of coupling device; otherwise, the low voltage equipment would be damaged due to the operating voltage of the energized machine (at hundreds or, even, thousands of Volts).…”

Section: Introductionmentioning

confidence: 99%

Online Frequency Response Analysis of Electric Machinery through an Active Coupling System Based on Power Electronics

Sant’Ana¹,

Lambert‐Torres²,

Bonaldi³

et al. 2021

Sensors

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This paper presents an innovative concept for the online application of Frequency Response Analysis (FRA). FRA is a well known technique that is applied to detect damage in electric machinery. As an offline technique, the machine under testing has to be removed from service—which may cause loss of production. Experimental adaptations of FRA to online operation are usually based on the use of passive high pass coupling—which, ideally, should provide attenuation to the grid voltage, and at the same time, allow the high frequency FRA signals to be injected at the machine. In practice, however, the passive coupling results in a trade-off between the required attenuation and the useful area obtained at the FRA spectra. This paper proposes the use of an active coupling system, based on power electronics, in order to cancel the grid voltage at the terminals of FRA equipment and allow its safe connection to an energized machine. The paper presents the basic concepts of FRA and the issue of online measurements. It also presents basic concepts about power electronics converters and the operating principles of the Modular Multilevel Converter, which enables the generation of an output voltage with low THD, which is important for tracking the grid voltage with minimum error.

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“…FRA is most frequently used to assess the state of windings [17], such as deformations and turn to turn short-circuit [1,16], by measuring their broad-spectrum frequency response transfer function. FRA can be divided into two main types, based on the different signals injected into the transformer: sweep frequency response analysis (SFRA) [18][19][20] and impulse frequency response analysis (IFRA). SFRA is commonly used for offline tests after a transformer failure and is hardly sufficient for preventing transformer failure.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Impulse Wave and Sweep Frequency Response Analysis Methods for Diagnosis of Transformer Winding Faults

Yang

Yong

2017

Energies

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Abstract:Monitoring of winding faults is the most important item used to determine the maintenance status of a transformer. Commonly used methods for winding-fault diagnosis require the transformer to exit operation before testing and an external exciting signal, whether the transformer is malfunctioning or not. However, if an overvoltage signal can be regarded as a broadband excitation source for fault diagnosis, then the interference caused by signal injection can be eliminated without the need for additional pulse or impulse signals. 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. Based on comparison of statistical indicators, it is found that the sensitivities of both methods are similar for detecting conditions of winding-ground and winding-interlayer short circuits. It is concluded that it is feasible to use a transient overvoltage monitoring system for winding-fault diagnosis.

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The application of sweep frequency response analysis for the online monitoring of power transformers

Cited by 14 publications

References 7 publications

Optimal Design of Power Transformer with Advance Core Material using ANSYS Technique

Optimal Design of Power Transformer with Advance Core Material using ANSYS Technique

Online Frequency Response Analysis of Electric Machinery through an Active Coupling System Based on Power Electronics

Comparison of Impulse Wave and Sweep Frequency Response Analysis Methods for Diagnosis of Transformer Winding Faults

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