A Method to Enhance Ground-Fault Computation

Huang, Shyh-Jier; Wan, Hsing-Ho

doi:10.1109/tpwrs.2009.2036331

Cited by 12 publications

(3 citation statements)

References 2 publications

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“…The use of symmetrical components [4] can also be applied to study the ground fault capacitive current values. Some research works have obtained excellent results using hybrid compensation methods [5,6] and their use, although it is not widespread employed by distribution electrical companies, is perfectly applicable to neutral ungrounded networks whereas other investigation works build different algorithms to determine the ground fault current value [7].…”

Section: State Of the Artmentioning

confidence: 99%

A Novel Ground Fault Non-Directional Selective Protection Method for Ungrounded Distribution Networks

et al. 2015

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This paper presents a new selective and non-directional protection method to detect ground faults in neutral isolated power systems. The new proposed method is based on the comparison of the rms value of the residual current of all the lines connected to a bus, and it is able to determine the line with ground defect. Additionally, this method can be used for the protection of secondary substation. This protection method avoids the unwanted trips produced by wrong settings or wiring errors, which sometimes occur in the existing directional ground fault protections. This new method has been validated through computer simulations and experimental laboratory tests.

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Section: State Of the Artmentioning

confidence: 99%

A Novel Ground Fault Non-Directional Selective Protection Method for Ungrounded Distribution Networks

et al. 2015

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“…in fires, electrocution of life, and widespread power outages, etc [4], [5]. Thus, the active MV distribution networks are urgently need to improve their capabilities of self-healing and selfrecovery from SPG fault [6], [7].…”

Section: Introductionmentioning

confidence: 99%

Fault Current Limitation With Energy Recovery Based on Power Electronics in Hybrid AC–DC Active Distribution Networks

Zhang

Guo

Zheng

et al. 2023

IEEE Trans. Power Electron.

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The active distribution networks are becoming increasingly complicated hybrid AC-DC systems constructed by massive power electronics, the magnitude and direction of power flow may change randomly at any time, making the usual protection potentially insensitive, increasing the negative impacts of single-phase-to-ground (SPG) fault which accounts for the majority of all faults that occurred in medium-voltage (MV) distribution networks in the past. The zero-sequence current in the impedance branch induced between the lines and ground will pass through the SPG fault branch as fault current. This study transfers the zero-sequence current from the SPG fault branch to the power electronic branch connected between the faulty phase and ground involved in the construction of hybrid AC-DC system, thereby limiting SPG fault branch current and reducing fault node potential. This helps to extinguish fault arc and provides engineers with safe conditions to clear faulty elements from the SPG fault branch. The power electronic bears the same fault current and fault phase voltage as SPG fault and will therefore absorb energy in the same way as SPG fault, the energy is recovered and routed back to the hybrid AC-DC system via interconnected power electronics for reuse. The proposed is verified by simulation and experiment.

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“…There are several methods to detect single ground faults at isolated networks [126][127][128][129][130][131][132]; some of them use Wavelet analysis [133][134]. Normally once the fault has been detected, the different protection methods can give an alarm or a tripping command in order to avoid damage to the power distribution network elements, and remove from service the zone with fault condition, providing selectivity.…”

Section: Novel Ground Fault Non Directional Selective Protection Methodsmentioning

confidence: 99%

New methods and protection systems for AC and DC power networks

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A Method to Enhance Ground-Fault Computation

Cited by 12 publications

References 2 publications

A Novel Ground Fault Non-Directional Selective Protection Method for Ungrounded Distribution Networks

A Novel Ground Fault Non-Directional Selective Protection Method for Ungrounded Distribution Networks

Fault Current Limitation With Energy Recovery Based on Power Electronics in Hybrid AC–DC Active Distribution Networks

New methods and protection systems for AC and DC power networks

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