Improvements to transformer differential protection - design and test experience

Moscoso, M.; Lloyd, Graeme T.; Liu, K.; Wang, Z.

doi:10.1049/cp.2012.0035

Cited by 4 publications

(5 citation statements)

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“…First step: Compute matrices [ R ] and [ L ] of the power transformer from manufacturer's test data 20,31,46 without considering the internal faults 26. …”

Section: Power System Simulation Using Emtpmentioning

confidence: 99%

“…5. A 50‐MVA, 115/23‐kV three‐phase two‐winding transformer was employed in simulations with all parameters and configuration provided by the manufacturer 20,31,46.…”

Section: Power System Simulation Using Emtpmentioning

confidence: 99%

“…5. A 50-MVA, 115/23-kV three-phase two-winding transformer was employed in simulations with all parameters and configuration provided by the manufacturer [20,31,46]. Fault position of point Z AF 10-80% (each step is 10%) measured from the line end of the windings as shown in Fig.…”

Section: Simulation Case Studiesmentioning

confidence: 99%

“…In the literature for fault detection, several decision algorithms 1–42 have been developed to be employed in the protective relay for preventing maloperation of the protective equipment under different nonfault conditions, including magnetizing inrush current, ratio mismatch, through‐fault current, etc. There are many techniques 1–42 for detecting faults, such as artificial neural networks (ANNs) 12,30,39,40, transient‐based protection 13,18–20, finite element 14, fuzzy logic 35, hybrid systems 14,32, and so on. An algorithm for protecting a transformer with three windings using the increments of flux linkages (IFLs) has been proposed by Kang et al 2.…”

Section: Introductionmentioning

confidence: 99%

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A discrete wavelet transform approach to discriminating among inrush current, external fault, and internal fault in power transformer using low-frequency components differential current only

Ngaopitakkul

Jettanasen

2014

IEEJ Trans Elec Electron Eng

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This paper proposes an algorithm based on discrete wavelet transform (DWT) for discriminating among inrush current, internal fault, and external fault in power transformers. Fault conditions are simulated using the Alternative Transients Program/Electromagnetic Transients Program (ATP/EMTP). Daubechies4 (db4) is employed as the mother wavelet to decompose low‐frequency components from fault signals. The ratio between per unit (p.u.) differential current and p.u. time is suggested as an index. The numerator of the ratio is the difference between the maximum differential current and the minimum differential current in terms of p.u. with a base value selected at the transformer‐rated current. The ratio is calculated for all three phases, and from a trial and error process the indices for the separation among the internal fault condition, the external fault condition, and inrush condition are defined. The results obtained from the proposed technique show good accuracy for discriminating faults in the considered system. In addition, the proposed algorithm uses data of the differential current with a time of quarter cycle under the analysis. © 2014 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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“…First step: Compute matrices [ R ] and [ L ] of the power transformer from manufacturer's test data 20,31,46 without considering the internal faults 26. …”

Section: Power System Simulation Using Emtpmentioning

confidence: 99%

“…5. A 50‐MVA, 115/23‐kV three‐phase two‐winding transformer was employed in simulations with all parameters and configuration provided by the manufacturer 20,31,46.…”

Section: Power System Simulation Using Emtpmentioning

confidence: 99%

Section: Simulation Case Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A discrete wavelet transform approach to discriminating among inrush current, external fault, and internal fault in power transformer using low-frequency components differential current only

Ngaopitakkul

Jettanasen

2014

IEEJ Trans Elec Electron Eng

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“…This electrical protection is based on the detection of differential current between the input current and the output current of the circuit under protection [2]. The correct operation of the differential protection is a very relevant research topic, not only related to generators, but also related to transformers [3] and bus bars. This is because of the effects of the saturation of Current Transformers (CTs), wrong selection of CTs [4], or CT burden unbalances, in the correct operation of this electrical protection.…”

Section: Introductionmentioning

confidence: 99%

Consideration of multi-phase criterion in the differential protection algorithm for high-impedance grounded synchronous generators

Blánquez

Rebollo

Granizo

et al. 2013

2013 12th International Conference on Environment and Electrical Engineering

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The generator differential protection is one of the most important electrical protections of synchronous generator stator windings. Its operation principle is based on the comparison of the input current and output current at each phase winding. Unwanted trip commands are usually caused by CT saturation, wrong CT selection, or the fact that they may come from different manufacturers. In generators grounded through high impedance, only phase-to-phase or three-phase faults can be detected by the differential protection. This kind of fault causes differential current to flow in, at least, two phases of the winding. Several cases of unwanted trip commands caused by the appearance of differential current in only one phase of the generator have been reported. In this paper multi-phase criterion is proposed for generator differential protection algorithm when applied to high impedance grounded generators.

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Not all differentials are the same: How different percent differential relay algorithm methods can impact relay settings and performance

Proctor

2016

2016 69th Annual Conference for Protective Relay Engineers (CPRE)

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Improvements to transformer differential protection - design and test experience

Cited by 4 publications

References 0 publications

A discrete wavelet transform approach to discriminating among inrush current, external fault, and internal fault in power transformer using low-frequency components differential current only

A discrete wavelet transform approach to discriminating among inrush current, external fault, and internal fault in power transformer using low-frequency components differential current only

Consideration of multi-phase criterion in the differential protection algorithm for high-impedance grounded synchronous generators

Not all differentials are the same: How different percent differential relay algorithm methods can impact relay settings and performance

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