Analysis of earth faults in the MV grid using the EMTP-ATP program

Grąkowski, Ł.; Gębczyk, K.

doi:10.15199/48.2019.02.32

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…Many research works are devoted to the analysis of ground fault phenomena in MV networks with resonant-grounded [9][10][11] or resistor-grounded [12] neutral and containing overhead lines [4,[13][14][15]. However, the operating conditions of these networks differ significantly from those of distribution networks installed in underground mines [1].…”

Section: Introductionmentioning

confidence: 99%

Ground Fault in Medium-Voltage Power Networks with an Isolated Neutral Point: Spectral and Wavelet Analysis of Selected Cases in an Example Industrial Network Modeled in the ATP-EMTP Package

Kuliński,

Heyduk

2024

Energies

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The paper presents some case spectral analysis of zero-sequence voltages and currents in an example industrial power distribution network. The network layout is based on typical power delivery networks in underground coal mines. Ground fault simulations have been made using an ATP/EMTP program. Due to the high environmental risks, the reliability of the protection relay operation related to their selectivity plays an important role. This paper tries to find the reasons for nonselective operation and unnecessary tripping in extensive mine cable networks, particularly with large power sources of higher-order harmonics. It was found that in transient states—due to the decaying oscillations occurring in complex RLC circuits—the results of short time measurements of the criterion values for ground fault protective relays can be overestimated (particularly for small values of ground resistance) and lead to nonselective tripping of a healthy cable line. Therefore, it might be advisable to increase the integration time used for measuring rms values. Also, if there is a significant level of higher harmonics in the industrial network generated by high-power converters, it should be noted that the higher harmonics of the ground fault current and currents measured by ground fault protection relays assume much higher values, which may also cause nonselective tripping. In this case, it may be advisable to use higher harmonic filters in the measuring circuits and to select a sufficiently high sampling frequency in the digital protective relays.

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Section: Introductionmentioning

confidence: 99%

Ground Fault in Medium-Voltage Power Networks with an Isolated Neutral Point: Spectral and Wavelet Analysis of Selected Cases in an Example Industrial Network Modeled in the ATP-EMTP Package

Kuliński,

Heyduk

2024

Energies

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“…insulator, which causes an electric arc. Air arcs in the MV distribution network are mainly AC arcs, including pantograph arcs, ground fault arcs, and secondary arcs [1][2][3][4]. The high temperature of arc discharge can damage the system's insulation and even cause electrical fire accidents.…”

Section: Introductionmentioning

confidence: 99%

Temperature and composition of AC arc plasma of medium voltage distribution networks in the air

Zhou¹,

Yuan²,

Wei³

et al. 2022

J. Phys. D: Appl. Phys.

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AC electric air arcs in medium voltage (MV) distribution networks, including railway catenary, photovoltaic power generation systems, and traditional distribution networks, can cause insulation damage accidents. Although various studies have been performed on the macroscopic characteristics of the MV AC arc in the air, the research on the physical properties of the arc, such as temperature field and particle composition, is relatively lacking. This work deals with diagnosing the temperature and particle composition of the arc under laboratory conditions based on the arc generation and the moiré deflection diagnosis systems. Based on the experimental results, there are three typical stages in developing the MV AC arc: the initial, transition, and stable combustion. The temperature during the stable combustion of the arc is between 1500–2100 K, while the fluctuation period is half a power frequency cycle. The particle components of the arc are mainly composed of O2, N2, and O. Different from the DC arc, the AC arc exhibits a zero-crossing extinguishing phenomenon, while the gap temperature is still high after extinguishing the arc, and the insulation has not been fully restored. This research provides a method for diagnosing MV AC arcs in the air under laboratory conditions and initial values for the arc modeling.

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Analysis of earth faults in the MV grid using the EMTP-ATP program

Cited by 2 publications

References 2 publications

Ground Fault in Medium-Voltage Power Networks with an Isolated Neutral Point: Spectral and Wavelet Analysis of Selected Cases in an Example Industrial Network Modeled in the ATP-EMTP Package

Ground Fault in Medium-Voltage Power Networks with an Isolated Neutral Point: Spectral and Wavelet Analysis of Selected Cases in an Example Industrial Network Modeled in the ATP-EMTP Package

Temperature and composition of AC arc plasma of medium voltage distribution networks in the air

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