Transmission lines differential protection based on an alternative incremental complex power alpha plane

Almeida, Maria Leonor Silva de; Silva, Kleber M.

doi:10.1049/iet-gtd.2016.0229

Cited by 33 publications

(8 citation statements)

References 18 publications

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“…A TLDP (Transmission Line Differential Protection) method based on alpha plane has been presented in [24,25]. An alpha plane of incremental complex power has been used in [19] and the restraint characteristic is denied.…”

Section: Introductionmentioning

confidence: 99%

A New Practical Approach for Discrimination between Inrush Currents and Internal Faults in Power Transformers

Mohammadpour

Dashti

Shaker

2020

Technol Econ Smart Grids Sustain Energy

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The power transformers are protected by differential relays. These relays use the second harmonic blocking to distinguish inrush current from internal fault current. In recent years, the performance of the second harmonic blocking has decreased and therefore new methods are needed to distinguish inrush current from internal fault current. The aim of this study is to present a new method for discrimination between magnetizing inrush currents and internal faults in differential protection of power transformers. The proposed scheme is based on calculating the dq0 transformation of current signals in the abc phases of transformer terminals for different inrush current and internal fault signals. Creating new waveforms using mathematical calculations, the signals are identifiable by their characteristics. The accurate diagnosis is based on creating a classification pattern for the discrimination algorithm. To substantiate the preciseness of proposed methodology, different states of inrush and fault currents are simulated in PSCADTM/EMTDCTM. Consequently, calculations and the distinction process are carried-out in MATLAB environment. The discrimination procedure needs only current signal data of less than a quarter of power frequency cycle and uses very simple classification rules. Eventually, both simulation and experimental results show that the accuracy of proposed method is high. The results of this study confirm that simple and accurate methods which use patterns can be developed for distinguishing the internal faulty current of transformer from inrush and healthy current.

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Section: Introductionmentioning

confidence: 99%

A New Practical Approach for Discrimination between Inrush Currents and Internal Faults in Power Transformers

Mohammadpour

Dashti

Shaker

2020

Technol Econ Smart Grids Sustain Energy

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“…Based on the above context and on the advantages arising from the use of air‐core dry‐type shunt reactors, this paper presents a current differential protection, which was adapted from the algorithm described in [18]. The proposed solution is based only on the zero sequence current (calculated through the currents measured at reactor phase terminals) and the current obtained from the neutral terminal, that is, the need for PTs is eliminated.…”

Section: Introductionmentioning

confidence: 99%

Air‐core dry‐type shunt reactor protection based on an alternative current alpha plane

Almeida

Peres

Santos

2020

IET Generation Trans & Dist

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This paper proposes an alternative current alpha plane protection for shunt reactors, which is able to identify internal faults, including turn-to-turn faults. The proposed algorithm is based only on zero sequence and neutral currents, eliminating the need for voltage measurements. Furthermore, the proposed algorithm is based on an alternative current alpha plane, where the restraint characteristic is defined simply as its left half-plane, in such a way that minimal settings are required. In order to evaluate the performance of the proposed algorithm, the Alternative Transients Program was used to simulate different internal faults into an air-core dry-type shunt reactor connected to a 230 kV/60 Hz transmission line. The proposed algorithm performance was compared with the restricted earth fault function. From the obtained results, it is demonstrated that the proposed protection properly operates in turn-to-ground and turn-to-turn faults with operation times shorter than one power cycle, even for 1% of short-circuited turns. On the other hand, restricted earth fault function failed to operate in some of these cases. The proposed algorithm ensured the integrity of the air-core dry-type shunt reactors in all evaluated scenarios, correctly restraining in all simulated external faults (including cases with current transformer saturation). Thus, the proposed algorithm is considered a reliable and promising alternative for shunt reactors protection.How to cite this article: de Almeida MS, Peres LM, Santos Guilherme Gomes dos. Air-core dry-type shunt reactor protection based on an alternative current alpha plane.

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“…For a fault, electromagnetic waves travel along the transmission line and are used for protection. The combination of arrival time, polarity and magnitude of travelling waves is applied for the travelling-wave-based line protection [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Depending on the availability of data, travelling-wave-based protection schemes are classified into two; using measurements from one end [1,9,11] and both ends [6,7,10,16,18] of a line.…”

Section: Introductionmentioning

confidence: 99%

Travelling‐wave‐based protection of transmission line using single‐end data

Sawai

Pradhan

2019

IET Generation, Transmission & Distribution

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Transmission lines differential protection based on an alternative incremental complex power alpha plane

Cited by 33 publications

References 18 publications

A New Practical Approach for Discrimination between Inrush Currents and Internal Faults in Power Transformers

A New Practical Approach for Discrimination between Inrush Currents and Internal Faults in Power Transformers

Air‐core dry‐type shunt reactor protection based on an alternative current alpha plane

Travelling‐wave‐based protection of transmission line using single‐end data

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