A novelty digital algorithm for online measurement of dielectric loss factor of electronic transformers

Zhang, Zhi; Li, Hongbin; Li, Zhenhua

doi:10.1016/j.measurement.2012.11.029

Cited by 10 publications

(7 citation statements)

References 11 publications

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“…The aim is to overcome the limitations of the state-of-the-art where fault diagnosis is usually implemented for a single type of components of an UPS system, e.g., only power transformers in [7,8, or only battery modules for energy storage in [14][15][16][42][43][44][45][46][47]. In the state-of the-art often only some types of faults are addressed, e.g., [32][33][34][35][36][37][38][39][40][41] address only electrical and In Figure 10 moving from the original cell to the last curve an increaseˆ1.6 is detected in terms of R s andˆ1.5 in terms of f c . Figure 11 shows for all the cells in a string the distribution of operating voltage after the 4 months of accelerated aging tests.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, known works often address only some types of faults: e.g., [32][33][34][35][36][37][38][39][40][41] address only electrical and thermal faults, whereas [23,28,31] address only mechanical faults through visual inspection or acoustic analysis. For diagnosis of power transformers just the measurement of some electrical parameters is foreseen in state-of-the-art such as in [34,35,39], which measure the primary or secondary currents or their ratio, or in [36], which measures the insulation dielectric losses, or in [40,41], which measure no-load power losses, or in [33], which measures the stray reactance variations.…”

Section: Critical Analysis Of the State-of-the-art For Ups Predictivementioning

confidence: 99%

“…For diagnosis of power transformers just the measurement of some electrical parameters is foreseen in state-of-the-art such as in [34,35,39], which measure the primary or secondary currents or their ratio, or in [36], which measures the insulation dielectric losses, or in [40,41], which measure no-load power losses, or in [33], which measures the stray reactance variations. Some techniques, such as those proposed in [31,40,41], cannot be implemented when the device under test (DUT) is working, but they require to switch-off the power system and to analyze the DUT in special test conditions.…”

Section: Critical Analysis Of the State-of-the-art For Ups Predictivementioning

confidence: 99%

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Distributed Measuring System for Predictive Diagnosis of Uninterruptible Power Supplies in Safety-Critical Applications

Saponara

2016

Energies

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This work proposes a scalable architecture of an Uninterruptible Power Supply (UPS) system, with predictive diagnosis capabilities, for safety critical applications. A Failure Mode and Effect Analysis (FMEA) has identified the faults occurring in the energy storage unit, based on Valve Regulated Lead-Acid batteries, and in the 3-phase high power transformers, used in switching converters and for power isolation, as the main bottlenecks for power system reliability. To address these issues, a distributed network of measuring nodes is proposed, where vibration-based mechanical stress diagnosis is implemented together with electrical (voltage, current, impedance) and thermal degradation analysis. Power system degradation is tracked through multi-channel measuring nodes with integrated digital signal processing in the transformed frequency domain, from 0.1 Hz to 1 kHz. Experimental measurements on real power systems for safety-critical applications validate the diagnostic unit.

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Section: Discussionmentioning

confidence: 99%

Section: Critical Analysis Of the State-of-the-art For Ups Predictivementioning

confidence: 99%

Section: Critical Analysis Of the State-of-the-art For Ups Predictivementioning

confidence: 99%

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Distributed Measuring System for Predictive Diagnosis of Uninterruptible Power Supplies in Safety-Critical Applications

Saponara

2016

Energies

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“…In IEEE Std 43-2013 [16], the absorption current, i A (t), is normally expressed as an inverse power function of time. The absorption current, i A (t), results from electron drift and molecular polarization of the insulation [5,26,15,33].…”

Section: General Theory Of Insulation Resistancementioning

confidence: 99%

Novel Polarization Index Evaluation Formula and Fractional-Order Dynamics in Electric Motor Insulation Resistance

Gonzalez¹,

Petráš

Ortigueira

2018

FCAA

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One of the common test metrics prescribed by IEEE Std 43 for testing motor insulation is the Polarization Index (P.I.) which evaluates the “goodness” of the machine’s insulation resistance by getting the ratio of the insulation resistance measured upon reaching t2 > 0 minutes (IRt2) from t1 > 0 minutes (IRt2) for t2 > t1 > 0, after applying a DC step voltage. However, such definition varies from different manufacturers and operators despite of decades of research in this area because the values of t1 and t2 remain to be uncertain. It is hypothesized in this paper that the main cause of having various P.I. definitions in literature is due to the lack of understanding of the electric motor’s dynamics at a systems level which is usually assumed to follow the dynamics of the exponential function. As a result, we introduce in this paper the fractional dynamics of an electric motor insulation resistance that could be represented by fractional-order model and where the resistance follows the property of a Mittag-Leffler function rather than an exponential function as observed on the tests done on a 415-V permanent magnet synchronous motor (PMSM). As a result, a new PMSM health measure called the Three-Point Polarization Index (3PPI) is proposed.

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“…In fact, electrical impedance spectroscopy was assessed to be effective for detection of bladder abnormalities, such as a bladder biopsy [22], a useful technique for the characterization of muscles' electrical properties [23], as well as for the possible development of an in vivo myocardial model for cardiovascular and respiratory systems [24]. Additionally, a genuine digital algorithm was developed, characterized and showed efficacy for online measurement of the dielectric loss factor of electronic transformers [25]. In the microwave frequency region, dielectric constant and loss of high-K thin film dielectric was determined [26], for tropical wood [27] and characterization of different vegetable oils are realized by Cataldo et al to confirm the potential of dielectric spectroscopy for quality purposes [28].…”

Section: Introductionmentioning

confidence: 99%

Dielectric and Bioimpedance Research Studies: A Scientometric Approach Using the Scopus Database

et al. 2018

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This work describes the worldwide applications of dielectric and bioimpedance measurements techniques in various fields. Dielectric and bioimpedance spectroscopy are major non-destructive measurement systems with great potential in the technology field. All results produced by the Scopus database were used as the core of the study in hand, with different items from journals, papers and conference proceedings being taken into account. The results of this analysis show that the interest in electrical properties has risen in the last years due to the advanced technological measurements offered on the scientific level. Results show that bioimpedance studies are considerably more recent compared to dielectric studies, and are more directed towards medical purposes while dielectric spectroscopy focuses on physical aspects, and is used mostly in engineering and material science. It can be stated that bioimpendance and dielectric spectroscopy are being increasingly applied and that they have the capacity to deepen and enhance research investigation.

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A novelty digital algorithm for online measurement of dielectric loss factor of electronic transformers

Cited by 10 publications

References 11 publications

Distributed Measuring System for Predictive Diagnosis of Uninterruptible Power Supplies in Safety-Critical Applications

Distributed Measuring System for Predictive Diagnosis of Uninterruptible Power Supplies in Safety-Critical Applications

Novel Polarization Index Evaluation Formula and Fractional-Order Dynamics in Electric Motor Insulation Resistance

Dielectric and Bioimpedance Research Studies: A Scientometric Approach Using the Scopus Database

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