Extended Park's vector approach-based differential protection of three-phase power transformers

Oliveira, Luís M. R.; Cardoso, António J. Marques

doi:10.1049/iet-epa.2011.0377

Cited by 42 publications

(32 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the obtained eigenvectors, the stator currents are projected into the new eigenvector state space and a severity index is easily calculated. Finally, in [20] an indicator of the degree of asymmetry defined as the ratio between the amplitude of the spectral component at the frequency of 2f and the DC level of the differential current Park's vector, gives enhanced sensitivity to detect incipient winding turn-to-turn faults.…”

Section: Introductionmentioning

confidence: 99%

A Fault Severity Index for Stator Winding Faults Detection in Vector Controlled PM Synchronous Motor

Hadef¹,

Djerdir²,

Ikhlef³

et al. 2015

Journal of Electrical Engineering and Technology

View full text Add to dashboard Cite

-Stator turn faults in permanent magnet synchronous motors (PMSMs) are more dangerous than those in induction motors (IMs) because of the presence of spinning rotor magnets that can be turned off at will. Condition monitoring and fault detection and diagnosis of the PMSM have been receiving a growing amount of attention among scientists and engineers in the past few years. The aim of this study is to propose a new detection technique of stator winding faults in a three-phase PMSM. This technique is based on the image analysis and recognition of the stator current Concordia patterns, and will allow the identification of turn faults in the stator winding as well as its correspondent fault index severity. A test bench of a vector controlled PMSM motor behaviors under short circuited turn in two phases stator windings has been built. Some experimental results of the phase to phase short circuits have been performed for diagnosis purpose.

show abstract

Section: Introductionmentioning

confidence: 99%

A Fault Severity Index for Stator Winding Faults Detection in Vector Controlled PM Synchronous Motor

Hadef¹,

Djerdir²,

Ikhlef³

et al. 2015

Journal of Electrical Engineering and Technology

View full text Add to dashboard Cite

show abstract

“…Recently, modern numerical protection technologies for power transformers have been proposed using wavelet transforms [10,11], neural networks [12,13], Park's components [14,15], and gradient vector of the differential current [16]. Wavelet-based algorithms were proven to achieve good accuracy [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…A restraining signal was obtained using Park's transform [14,15], whilst the slope of the differential current in each phase was used for differential protection [16]. These techniques successfully differentiate magnetic inrush from internal faults, particularly in the case of simultaneous inrush and internal faults, but difficulties arise in identifying the faulted phase and winding.…”

Section: Introductionmentioning

confidence: 99%

Induced Voltages Ratio-Based Algorithm for Fault Detection, and Faulted Phase and Winding Identification of a Three-Winding Power Transformer

et al. 2014

View full text Add to dashboard Cite

This paper proposes an algorithm for fault detection, faulted phase and winding identification of a three-winding power transformer based on the induced voltages in the electrical power system. The ratio of the induced voltages of the primary-secondary, primary-tertiary and secondary-tertiary windings is the same as the corresponding turns ratio during normal operating conditions, magnetic inrush, and over-excitation. It differs from the turns ratio during an internal fault. For a single phase and a three-phase power transformer with wye-connected windings, the induced voltages of each pair of windings are estimated. For a three-phase power transformer with delta-connected windings, the induced voltage differences are estimated to use the line currents, because the delta winding currents are practically unavailable. Six detectors are suggested for fault detection. An additional three detectors and a rule for faulted phase and winding identification are presented as well. The proposed algorithm can not only detect an internal fault, but also identify the faulted phase and winding of a three-winding power transformer. The various test results with Electromagnetic Transients Program (EMTP)-generated data show that the proposed algorithm successfully discriminates internal faults from normal operating OPEN ACCESSEnergies 2014, 7 6032 conditions including magnetic inrush and over-excitation. This paper concludes by implementing the algorithm into a prototype relay based on a digital signal processor.

show abstract

“…Oliveira and Cardoso [18,19] proposed Park's vector-based technologies, and Alencar et al [20] suggested the differential current gradient vector-based technologies.…”

Section: Introductionmentioning

confidence: 99%

“…Park's vector-based technologies [18,19] used a restraining signal obtained from Park's transform. The differential current gradient vector-based technology [20] used the slope of the differential current in each phase.…”

Section: Introductionmentioning

confidence: 99%

Saturation Detection-Based Blocking Scheme for Transformer Differential Protection

Lee

Won

et al. 2014

Energies

View full text Add to dashboard Cite

This paper describes a current differential relay for transformer protection that operates in conjunction with a core saturation detection-based blocking algorithm. The differential current for the magnetic inrush or over-excitation has a point of inflection at the start and end of each saturation period of the transformer core. At these instants, discontinuities arise in the first-difference function of the differential current. The second-and third-difference functions convert the points of inflection into pulses, the magnitudes of which are large enough to detect core saturation. The blocking signal is activated if the third-difference of the differential current is larger than the threshold and is maintained for one cycle. In addition, a method to discriminate between transformer saturation and current transformer (CT) saturation is included. The performance of the proposed blocking scheme was compared with that of a conventional harmonic blocking method. The test results OPEN ACCESSEnergies 2014, 7 4572 indicate that the proposed scheme successfully discriminates internal faults even with CT saturation from the magnetic inrush, over-excitation, and external faults with CT saturation, and can significantly reduce the operating time delay of the relay.

show abstract

Extended Park's vector approach-based differential protection of three-phase power transformers

Cited by 42 publications

References 34 publications

A Fault Severity Index for Stator Winding Faults Detection in Vector Controlled PM Synchronous Motor

A Fault Severity Index for Stator Winding Faults Detection in Vector Controlled PM Synchronous Motor

Induced Voltages Ratio-Based Algorithm for Fault Detection, and Faulted Phase and Winding Identification of a Three-Winding Power Transformer

Saturation Detection-Based Blocking Scheme for Transformer Differential Protection

Contact Info

Product

Resources

About