No-load loss measurements of power transformers under distorted supply voltage waveform conditions

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

doi:10.1109/tim.2003.809910

Cited by 24 publications

(11 citation statements)

References 5 publications

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“…Increase in voltage harmonics by 2% has resulted in increase of current harmonics by 1% only. However, higher voltage harmonics and overexcitation condition can severely change harmonic content of no-load current [36]. Similar analysis is also performed for 2 and 4 turns for fault on HV V -phase (Fig.…”

Section: Experimental Setup and Resultsmentioning

confidence: 91%

A Novel Offline to Online Approach to Detect Transformer Interturn Fault

Venikar

Umre

Suryawanshi

2016

IEEE Trans. Power Delivery

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This paper presents an approach based on use of transformer no-load and light load current harmonic analysis to detect presence of inter-turn fault at incipient stage. The presence of fault is detected by performing a trend analysis of specific harmonic components and primary current magnitude. Transformer testing methods suffer from a common drawback of off-line nature and require expert opinion for accurate condition assessment. This paper presents a method that transforms noload current harmonic analysis which is a special test for transformer testing into an on-line method at light load conditions. Thus, the necessity of complete shutdown and dependency on expert opinion is eliminated as it requires only one reference signature per phase. Proposed approach is verified for different vector groups of 3-phase core type transformer and three independent units connected in star-star and for fault on low voltage or high voltage winding of transformer. Experimentation presents, that proposed approach can detect presence of fault at an incipient stage involving less than 2% of turns and fault current up-to 1 p.u. A case study is presented that validates the method for transformer of higher power rating.

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Section: Experimental Setup and Resultsmentioning

confidence: 91%

A Novel Offline to Online Approach to Detect Transformer Interturn Fault

Venikar

Umre

Suryawanshi

2016

IEEE Trans. Power Delivery

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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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“…No-load loss is sensitive to the distortion of the supplyvoltage waveform [2]. The deterioration of the supply-voltage waveform is caused by industrial and domestic loads, e.g., switch-mode power supplies and fluorescent lamps that inject current harmonics in the power grid.…”

Section: Introductionmentioning

confidence: 99%

Harmonic Impact on Distribution Transformer No-Load Loss

Kefalas

Kladas

2010

IEEE Trans. Ind. Electron.

108

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The losses in European Union distribution transformers are estimated at about 33 TW · h/year, whereas reactive power and harmonic losses add a further 5 TW · h/year. The reduction of distribution transformer no-load loss is particularly important as the ratio of no-load to load losses is nearly three. In this paper, the no-load operation of wound-core transformers under sinusoidal and distorted supply-voltage conditions is investigated. For that purpose, a 2-D nonlinear transient finite-element analysis taking into account hysteresis has been developed. The hysteresis model is based on a modified Jiles-Atherton representation, and the proposed analysis is compared to experimental data.

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No-load loss measurements of power transformers under distorted supply voltage waveform conditions

Cited by 24 publications

References 5 publications

A Novel Offline to Online Approach to Detect Transformer Interturn Fault

A Novel Offline to Online Approach to Detect Transformer Interturn Fault

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

Harmonic Impact on Distribution Transformer No-Load Loss

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