Measurements and Correction of No-Load Losses of Power Transformers

So, E.; Arseneau, R.; Hanique, E.

doi:10.1109/tim.2004.843407

Cited by 20 publications

(8 citation statements)

References 6 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. However, this will increase the denial of service statistics of the power system.…”

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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“…Transformer excitation current analysis under distorted supply is studied [11]. Approach for measurement and correction of losses under no-load conditions for distorted supply is also offered for power transformers [12]. For distribution transformer, harmonic impact is studied for no-load losses [13].…”

Section: Introductionmentioning

confidence: 99%

Effective Method to Measure and Inspect the Hysteresis Loss of a Transformer

Chatterjee¹,

Das²,

Chatterjee³

2021

JEEICT

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This paper presents a study on the significance of source side harmonics and their effects on transformers. Source side harmonics are typically present in power electronic sources which are commonly used in renewable applications. The continued outcome of source side harmonics is observed on the hysteresis curve of a transformer. Single-phase transformers are used in the proposed study to determine the effect of harmonics on magnetization and demagnetization cycles using an electronic operational amplifier-based integrator circuit. A technique is also presented for effectively storing and plotting the hysteresis curve from the measured data. After the hysteresis curve is obtained, it is compared with standard data and a conclusion is obtained from the results about the presence of harmonics in the source. The hysteresis curve is thus found without removing the transformer from operation. The study also proposes a modified hysteresis model for the transformer considering the effect of source harmonics. The proposed study is an effective tool for easy measurement and detection of harmonics. The MATLAB/Simulink based simulations with suitable experiments validate the proposed study.

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“…The usual methods of measurement, applied to specimens of the material, fail completely at higher flux densities than because the power factor becomes very small and the magnetizing current very high [2].The major nonlinear effects in transformer iron core are saturation, eddy current and hysteresis. Saturation is the predominant effect in power transformers, followed by eddy current and hysteresis effects [3]. The iron core of transformers and other electromagnetic devices is laminated so that at 50 Hz or 60 Hz (or, in general, at power frequency) skin effect is Magnetizing Current, Harmonic Content and Power Factor as the Indicators of Transformer Core Saturation…”

Section: Introductionmentioning

confidence: 99%

Magnetizing Current, Harmonic Content and Power Factor as the Indicators of Transformer Core Saturation

Ismail¹,

Hasan²,

Taib³

2013

JOCET

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Abstract-The paper proposes a measurement method for obtaining the parameters needed to calculate a reliable indicator of the state of transformer core saturation. The major nonlinear effects in transformer core are saturation, eddy current and hysteresis. Saturation is the predominant effect in power transformers, followed by eddy current and hysteresis effects. In saturation, a transformer core act as a source of current generating harmonics, some of which will flow directly toward the primary and secondary windings. The method is based on magnetization current, harmonic content and power factor evaluated of the transformer no-load current with high magnetic flux density subjected. The investigation is done on single phase model core type transformer. The transformer is connected to variable voltage variable frequency (VVVF) source and the investigation is done on various flux densities. The results show that the magnetization current and harmonic content increase significantly when high magnetic flux densities are injected and vice versa with power factor that decrease sharply. These phenomena can be used as the indication of transformer core saturation.

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Measurements and Correction of No-Load Losses of Power Transformers

Cited by 20 publications

References 6 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

Effective Method to Measure and Inspect the Hysteresis Loss of a Transformer

Magnetizing Current, Harmonic Content and Power Factor as the Indicators of Transformer Core Saturation

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