A Kalman filter based digital percentage differential and ground fault relay for a 3-phase power transformer

Murty, Y.V.V.S.; Smolinski, W. J.

doi:10.1109/61.57970

Cited by 46 publications

(10 citation statements)

References 14 publications

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“…where A i [n] are the approximation coefficients, and D i [n] are the detail coefficients [16], [25], [26]. …”

Section: Dwtmentioning

confidence: 99%

“…Recently, WTbased techniques have been used by researchers to develop new approaches of digital differential relays because of reliability and security requirements for the protection of power transformers. However, most of the published papers are based on computer simulation results only [15], [16]. These techniques are implemented by successive decompositions of the input digitalized signal over variable time and frequency resolutions.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Implementation of the <inline-formula> <tex-math notation="TeX">$dq$</tex-math></inline-formula>-Axis Wavelet Packet Transform Hybrid Technique for Three-Phase Power Transformer Protection

Aktaibi

Rahman

Razali

2014

IEEE Trans. on Ind. Applicat.

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A successful development and implementation of the dq-axis components and the wavelet packet transform (WPT)-based hybrid technique for power transformer protection is introduced in this paper. In this approach, the high-frequency subband contents of the dq-axis components of the differential current is extracted using the WPT. This characterization helps to provide enough information to efficiently detect and discriminate internal faults from inrush currents in power transformers. This hybrid method provides accurate information with only one level of the WPT of the dq-axis components of the differential current for power transformer protection. A real-time experiment is carried out for different normal and abnormal operating conditions, such as inrush and internal faults for different cases of loading, to test the efficacy of the proposed algorithm. The experimental results show fast, accurate, and reliable responses to all different types of disturbances that may occur in power transformers.Index Terms-Digital differential protection, magnetizing inrush current, power transformers, synchronously rotating reference frame dq, wavelet packet transform (WPT).

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“…where A i [n] are the approximation coefficients, and D i [n] are the detail coefficients [16], [25], [26]. …”

Section: Dwtmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Experimental Implementation of the <inline-formula> <tex-math notation="TeX">$dq$</tex-math></inline-formula>-Axis Wavelet Packet Transform Hybrid Technique for Three-Phase Power Transformer Protection

Aktaibi

Rahman

Razali

2014

IEEE Trans. on Ind. Applicat.

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show abstract

“…The value of the WPT coefficients of the high frequency sub-band present in the axis components of the differential currents is determined and checked as Non-Fault Fault (12) where and . The value of is determined as (13) where is the -point circular convolution operation that can be calculated as (14) The vector in (13) is given as (15) where and are the axis components of the differential currents, and can be determined as in (16) and (17). …”

Section: Implementing the -Wpt-based Digital Relaymentioning

confidence: 99%

The Development of a $d$–$q$ Axis WPT-Based Digital Protection for Power Transformers

Saleh

Aktaibi

Ahshan

et al. 2012

IEEE Trans. Power Delivery

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This paper presents the analysis and development of a new digital differential protection for three phase (3 ) power transformers. The proposed digital protection is based on extracting high frequency sub-band contents present in the axis components of the differential currents in order to identify internal faults. The desired high frequency sub-band contents are extracted using a single-stage wavelet packet transform (WPT), which offers parameterizing the energy in the high frequency sub-band contents using a finite number of coefficients. The WPT coefficients contain information that offer accurate, fast, and reliable detection and classification of transient disturbances, including magnetizing inrush and internal fault currents that may be experienced by 3 power transformers. The WPT-based digital differential protection is implemented for off-line performance evaluation using differential currents collected from a 5 kVA, 3 , laboratory power transformer. Off-line test results demonstrate accurate, fast, and reliable detection, classification, and response to different types of fault and non-fault currents. These encouraging performances of the WPT-based digital differential protection are obtained with simple implementation, reduced computational burdens, and small memory requirements.Index Terms-Digital differential protection, digital filters, internal fault currents, magnetizing inrush current, synchronous rotating reference frame ( axis), three phase power transformers, wavelet analysis. NOMENCLATURE-point circular convolution operation. Continuous frequency.Discrete frequency. Scaling function.Wavelet function associated with . Set of real numbers. Inception angle. Set of integer numbers. Approximation signal at scale and shift .

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“…An analysis of Kalman filters applied to voltage phasors estimation is also given in (Woxd et al, 1985). A ground fault relaying schema based on Kalman filters is also proposed in (Murty & Smolinski, 1990). In this case only harmonic components are employed.…”

Section: Application Of Kalman Filters To Electrical Power Systemsmentioning

confidence: 99%

Estimation of Electrical Power Quantities by Means of Kalman Filtering

Pigazo¹,

Moreno²

2009

Kalman Filter Recent Advances and Applications

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A Kalman filter based digital percentage differential and ground fault relay for a 3-phase power transformer

Cited by 46 publications

References 14 publications

An Experimental Implementation of the <inline-formula> <tex-math notation="TeX">$dq$</tex-math></inline-formula>-Axis Wavelet Packet Transform Hybrid Technique for Three-Phase Power Transformer Protection

An Experimental Implementation of the <inline-formula> <tex-math notation="TeX">$dq$</tex-math></inline-formula>-Axis Wavelet Packet Transform Hybrid Technique for Three-Phase Power Transformer Protection

The Development of a $d$–$q$ Axis WPT-Based Digital Protection for Power Transformers

Estimation of Electrical Power Quantities by Means of Kalman Filtering

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