General earth fault protection for MV networks using wavelet decomposition and Bayesian criterion

Marciniak, Lubomir

doi:10.1051/e3sconf/20198402007

Cited by 3 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Review of publications and shortcomings of known solutions. The problem of the analysis of transients in networks with earthed neutral in order to create an effective algorithm for protection against unstable earth faults is being actively investigated in Europe and around the world [1][2][3]. In particular, the work [3] investigates the aperiodic component of the transient of a single-phase earth fault and analyzes its influence on the work of known methods of protection against such earth fault.…”

Section: с помощью математической модели компенсированной электрическmentioning

confidence: 99%

Мultifrequency Protecting Method Against Earth-Faults of Phase in the Compensated Electric Networks

Syvokobylenko¹,

Лысенко²

2020

Elektroteh. elektromeh.

View full text Add to dashboard Cite

Introduction. A significant proportion of earth faults in 6-35 kV networks is a transient and short-lived process, which is followed by an electric arc. Problem. In such cases, earth-fault protection that responds to steady-state current and voltage is not able to operate properly. Also, the use of the Petersen coil to compensate for the capacitive earth fault current complicates the protection function because it significantly reduces the single phase earth fault current in steady state. Purpose. To develop selective single-phase earth faults protection algorithm using harmonic components that occur in zero-sequence currents and voltage in the transient process. Method. A mathematical model of the power supply system is applied to study the frequency components of currents and voltage of zero sequence in compensated electrical networks with phase-to-earth faults, and a mathematical model is used to test the operation of the developed protection algorithm. The results showed that, the reactive power for harmonic components of the frequency greater than 100 Hz, which are separated from the current and voltage of zero sequence in compensated electrical networks on the damaged feeder, is positive regardless of the degree of compensation of the capacitive current. That may be the basis of the principle of directional protection. Originality. Phase-to-earth fault selective protection algorithm has been developed. In that algorithm, first derivatives of currents and voltages of zero sequence are found, to reduce the influence of aperiodic components. And then, by using of the Fourier transform, a number of harmonic orthogonal components are extracted from them. Reactive power is calculated for each of frequency component and their total sum is found. If that sum excess of threshold, the relay will make a decision. The reliability of the developed protection algorithm is confirmed by the results of mathematical modeling and verification of the test sample at the laboratory stand and by means of field signals that were recorded by digital loggers at the substations. References 10, table 1, figures 6.

show abstract

Section: с помощью математической модели компенсированной электрическmentioning

confidence: 99%

Мultifrequency Protecting Method Against Earth-Faults of Phase in the Compensated Electric Networks

Syvokobylenko¹,

Лысенко²

2020

Elektroteh. elektromeh.

View full text Add to dashboard Cite

show abstract

Adaptive Zero-Sequence Overcurrent Criterion for Earth Fault Detection for Fault Current Passage Indicators in Resistor Grounded Medium Voltage Networks

Olejnik

2021

IEEE Access

View full text Add to dashboard Cite

Earth faults are the most common disturbances in medium voltage networks. They cause threats to equipment and people, and reduce the quality and reliability of electricity supply. Detection and localization of earth faults is a key challenge to network operators, therefore it is important to constantly develop criteria that allow for an unequivocal assessment of the current network state. This article focuses analysis of effectiveness of classic zero-sequence overcurrent criterion and on modification of the zerosequence overcurrent criterion applied in fault current passage indicators, which are the devices used to effectively detect and locate earth faults. Two new adaptation criteria for networks with resistor grounded neutral point have been proposed, which enable significant improvement of the effectiveness of earth faults detection, in particular high impedance ones. The effectiveness of the criteria was verified computationally and in simulations. In certain situations, the proposed solutions may be over 40% more effective than the classic criterion. The value of detected transition resistance R F also increases significantly. All the abovementioned advantages make their potential use in practice very beneficial.

show abstract

Zbiorcze kierunkowe zabezpieczenie ziemnozwarciowe wykorzystujące kryterium Bayesa dla mocy biernych trzecich harmonicznych

Marciniak

2020

ELECTROTECHNICAL REVIEW

View full text Add to dashboard Cite

General earth fault protection for MV networks using wavelet decomposition and Bayesian criterion

Cited by 3 publications

References 4 publications

Мultifrequency Protecting Method Against Earth-Faults of Phase in the Compensated Electric Networks

Мultifrequency Protecting Method Against Earth-Faults of Phase in the Compensated Electric Networks

Adaptive Zero-Sequence Overcurrent Criterion for Earth Fault Detection for Fault Current Passage Indicators in Resistor Grounded Medium Voltage Networks

Zbiorcze kierunkowe zabezpieczenie ziemnozwarciowe wykorzystujące kryterium Bayesa dla mocy biernych trzecich harmonicznych

Contact Info

Product

Resources

About