A new method for recognizing internal faults from inrush current conditions in digital differential protection of power transformers

Golshan, Mohamad Esmail Hamedani; Saghaian-nejad, M.; Saha, Akshay Kumar; Samet, Haidar

doi:10.1016/j.epsr.2003.11.015

Cited by 50 publications

(24 citation statements)

References 6 publications

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“…In order to improve the algorithms based on the second harmonic, some techniques such as voltage restraint [5], dynamic digital filter [6], and harmonic characteristics based schemes [7,8] have been proposed recently.…”

Section: Introductionmentioning

confidence: 99%

A runs test‐based method for discrimination between internal faults and inrush currents in power transformers

Fani

Golshan

Abyaneh

et al. 2010

Int Trans Elec Energy Syst

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SUMMARYA new method based on runs test is proposed to distinguish the inrush currents from the internal faults in power transformers, which is derived from the inherent differences between these waveforms. First, two statistical hypotheses that represent these differences are defined. Then by testing these hypotheses using runs test and by comparing the outputs of the hypotheses, a criterion to identify the internal fault is obtained. A total of 200 experimental cases are used to test the performance of the technique. In all of the tests, the proposed method accurately distinguished between fault and inrush currents without any errors. Also the suitable performance of the method is demonstrated by simulation of different faults and switching conditions on a power transformer. For this purpose, a small part of Iran power system involving a power transformer and the transmission lines on both sides of the transformer has been considered. To include effective factors on differential current components, the elements of this power system have been precisely modeled in PSCAD/EMTDC.

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Section: Introductionmentioning

confidence: 99%

A runs test‐based method for discrimination between internal faults and inrush currents in power transformers

Fani

Golshan

Abyaneh

et al. 2010

Int Trans Elec Energy Syst

Self Cite

View full text Add to dashboard Cite

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“…In addition, any internal fault with energizing cannot be cleared quickly until the inrush current fades out, and thus, the differential relay is unblocked. To improve the performance of the second harmonic-based algorithms, some novel techniques such as voltage restraint [6], complex second harmonic restraint [7], harmonic restraint and blocking methods with a wave-shape recognition technique [8], dynamic digital filter [9], and harmonic characteristics-based schemes [10,11] have been proposed.…”

Section: Introductionmentioning

confidence: 99%

A frequency curves analysis-based method for transformers differential protection

Fani

Golshan

Saghaian-nejad

2010

Euro. Trans. Electr. Power

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SUMMARYThis paper uses different geometrical structure of inrush current with respect to that of fault current for the identification of transformer magnetizing inrush. For this purpose, the differential current is considered as a stochastic signal, and a scheme based on stochastic analysis of differential currents is proposed. The scheme converts changes in slope of inrush and fault currents as a major feature of difference between them into a quantitative description by using the skewness concept of frequency curves. Skewness is the degree of asymmetry of a curve, usually taken relative to a normal curve. Internal faults are discriminated from inrush conditions by investigating the signs of the skewness coefficients corresponding to three-phase differential currents. Various experimental cases verify the dependability, security, and fast operation of the proposed algorithm.

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“…A sensitive detection method for such faults is described. As a result, most research works are interested in only the effects from magnetizing inrush current and the discrimination between magnetizing inrush current and internal faults [1][2][3][4][5][6][7][8], and etc.…”

Section: Introductionmentioning

confidence: 99%

“…The relaying algorithm consists of flux-differential current derivative curve, harmonic restraint, and percentage differential characteristic curve. In [4], a new algorithm based on processing differential current harmonics is proposed for digital differential protection of power transformers. This algorithm has been developed by considering different behavior of second harmonic components of the differential currents under fault and inrush current conditions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Spectrum Comparison Technique of DWT for Discriminating between External Fault and Internal Fault in Power Transformer

Jettanasen

Ngaopitakkul²

2012

Journal of International Council on Electrical Engineering

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-This paper proposes a technique for detecting and identifying internal winding fault of threephase two-winding transformer. A spectrum component obtained from DWT of differential current is analyzed. A ratio between per unit differential current and per unit time is calculated and performed as comparison indicator in order to discriminate between internal fault condition and external fault condition. Various cases based on Thailand electricity transmission and distribution systems are studied to verify the validity of the proposed algorithm. Results show that the proposed technique has good accuracy to detect fault and to identify its position in the considered system.

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A new method for recognizing internal faults from inrush current conditions in digital differential protection of power transformers

Cited by 50 publications

References 6 publications

A runs test‐based method for discrimination between internal faults and inrush currents in power transformers

A runs test‐based method for discrimination between internal faults and inrush currents in power transformers

A frequency curves analysis-based method for transformers differential protection

The Spectrum Comparison Technique of DWT for Discriminating between External Fault and Internal Fault in Power Transformer

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