Diagnosing Shorted Turns on the Windings of Power Transformers Based Upon Online FRA Using Capacitive and Inductive Couplings

Behjat, Vahid; Vahedi, A.; Setayeshmehr, A.; Borsi, H.; Gockenbach, E.

doi:10.1109/tpwrd.2011.2151285

Cited by 116 publications

(53 citation statements)

References 15 publications

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“…Behjat et al [108] investigated the feasibility for online transfer function monitoring of the power transformers windings through a quite simple, economic, and noninvasive capacitive sensor installed on the surface of the transformer bushing is presented. …”

Section: Frequency Response Analysismentioning

confidence: 99%

Electrical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

Fofana

Hadjadj

2016

Energies

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Abstract:The condition of the internal cellulosic paper and oil insulation are of concern for the performance of power transformers. Over the years, a number of methods have been developed to diagnose and monitor the degradation/aging of the transformer internal insulation system. Some of this degradation/aging can be assessed from electrical responses. Currently there are a variety of electrical-based diagnostic techniques available for insulation condition monitoring of power transformers. In most cases, the electrical signals being monitored are due to mechanical or electric changes caused by physical changes in resistivity, inductance or capacitance, moisture, contamination or aging by-products in the insulation. This paper presents a description of commonly used and modern electrical-based diagnostic techniques along with their interpretation schemes.

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Section: Frequency Response Analysismentioning

confidence: 99%

Electrical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

Fofana

Hadjadj

2016

Energies

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“…In addition, the integrated coupler can be used to transfer power, which realizes simultaneous power and data transmission [106]. Besides, the inductive and capacitive hybrid system can also be used in other applications, such as remote sensing [107], electric vehicle charging [108], DC-DC converter [109], and electric motor diagnosing [110].…”

Section: Combination Of Ipt and Cpt Technologiesmentioning

confidence: 99%

A Review on the Recent Development of Capacitive Wireless Power Transfer Technology

2017

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Capacitive power transfer (CPT) technology is an effective and important alternative to the conventional inductive power transfer (IPT). It utilizes high-frequency electric fields to transfer electric power, which has three distinguishing advantages: negligible eddy-current loss, relatively low cost and weight, and excellent misalignment performance. In recent years, the power level and efficiency of CPT systems has been significantly improved and has reached the power level suitable for electric vehicle charging applications. This paper reviews the latest developments in CPT technology, focusing on two key technologies: the compensation circuit topology and the capacitive coupler structure. The comparison with the IPT system and some critical issues in practical applications are also discussed. Based on these analyses, the future research direction can be developed and the applications of the CPT technology can be promoted.

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“…From (5) and (13), it can be seen that (13) indicates an increase in rms value due to presence of fault. From (5), percentage of 3 rd and 5 th harmonic (as those are prominent) w.r.t.…”

Section: Phenomenon Of Inter-turn Fault and Effect On No-load Andmentioning

confidence: 99%

“…The major drawbacks are the offline nature and restricted use for higher capacity transformers. Efforts are made in deriving on-line application as reported in [13], [14]. However, it has reduced sensitivity and requires more efforts for developing a practical system.…”

Section: Introductionmentioning

confidence: 99%

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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Diagnosing Shorted Turns on the Windings of Power Transformers Based Upon Online FRA Using Capacitive and Inductive Couplings

Cited by 116 publications

References 15 publications

Electrical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

Electrical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

A Review on the Recent Development of Capacitive Wireless Power Transfer Technology

A Novel Offline to Online Approach to Detect Transformer Interturn Fault

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