Mathematical morphology‐based single phase‐to‐ground fault feeder selector for a resonant grounded distribution system

Han, Xinlei; Li, M. S.; Zhang, L. L.

doi:10.1002/tee.22596

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…where S 1 kj and S 2 kj are the similarities of feeder k and arbitrary feeder j at the first and second stages, respectively; S 1 kmax and S 2 kmax are the maximum values of the similarity between feeder k and the other feeder at the first and second stages, respectively; and K is the total number of feeders. The formula used for this calculation is presented in (10).…”

Section: B Proposed Fault Feeder Identification Methods Involving Secondary Faultmentioning

confidence: 99%

“…For a more comprehensive understanding of this phenomenon, a range of transient signal based algorithms have been investigated extensively in recent years [7]. In general, the wavelet transform [8], S-transform [9], mathematical morphology [10], and Hilbert-Huang transform [11] are routinely used for extracting transient features of the zero-sequence current. In [12], the amplitude and polarity information of the transient zero-sequence current has been used to form the detection criteria.…”

Section: Introductionmentioning

confidence: 99%

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Fault Feeder Identification in Non-effectively Grounded Distribution Network with Secondary Earth Fault

Shu

Zang

Zhang

et al. 2021

Journal of Modern Power Systems and Clean Energy

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Secondary earth faults occur frequently in power distribution networks under harsh weather conditions. Owing to its characteristics, a secondary earth fault is typically hidden within the transient of the first fault. Therefore, most researchers tend to focus on a feeder with single fault while disregarding secondary faults. This paper presents a fault feeder identification method that considers secondary earth faults in a non-effectively grounded distribution network. First, the wavelet singular entropy method is used to detect a secondary fault event. This method can identify the moment at which a secondary fault occurs. The zero-sequence current data can be categorized into two fault stages. The first and second fault stages correspond to the first and secondary faults, respectively. Subsequently, a similarity matrix containing the time-frequency transient information of the zero-sequence current at the two fault stages is defined to identify the fault feeders. Finally, to confirm the effectiveness and reliability of the proposed method, we conduct simulation experiments and an adaptability analysis based on an electromagnetic transient program.

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Section: B Proposed Fault Feeder Identification Methods Involving Secondary Faultmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fault Feeder Identification in Non-effectively Grounded Distribution Network with Secondary Earth Fault

Shu

Zang

Zhang

et al. 2021

Journal of Modern Power Systems and Clean Energy

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“…To be free from the transient process interference, the extracted equivalent admittances must be the power frequency quantity. It needs (3)(4)(5) τ to enter the steady-state after faults, and τ is the network time constant, which is determined by the network admittance parameters [25].…”

Section: Figure 4 Simulation Modelmentioning

confidence: 99%

“…To ensure personal, equipment safety and power supply reliability for users, the medium and low voltage distribution networks in China, Japan and some European countries usually adopt neutral non‐effective grounding operation, which mainly includes neutral ungrounded mode (NUM), neutral resonance grounding mode (NRGM) and neutral pure‐resistance grounding mode (NPRGM) [2]. The distribution network with the above neutral modes has the advantages of small fault current and symmetrical line voltage when SPGF occurs [3]. However, during the fault, the normal phase voltage (NPV) rises to near the line voltage.…”

Section: Introductionmentioning

confidence: 99%

Location for single‐phase grounding fault in distribution network based on equivalent admittance distortion rate

Chen

Yin

et al. 2021

IET Generation Trans & Dist

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To solve the problem of difficult location (especially high grounding resistances) for singlephase grounding faults in distribution networks, a fault location method based on equivalent admittance distortion rate is proposed in this paper. The equivalent admittance distortion rates are first obtained by measuring the pre-fault and post-fault equivalent admittances of each phase, each feeder and each section. Then the phase with the largest equivalent admittance distortion rate in each phase is determined as the fault phase, the feeder with the largest equivalent admittance distortion rate in each feeder is determined as the fault feeder, and the section with the largest equivalent admittance distortion rate in each section is determined as the fault section. Moreover, a fault identification strategy for single-phase grounding faults is proposed to improve the robustness of this method. By measuring bus voltages and currents before and after faults, the fault type with only one-phase in which voltage decreased and current increased is identified as single-phase grounding faults. Compared with the existing methods, simulation results show that the proposed method is simple to implement and has strong robustness to high grounding resistances, long grounding distances and interference harmonics. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…The FLS methods based on transient information are expected to further improve the accuracy of FLS in distribution networks, and have been a focus for relevant researchers in recent years. FLS methods based on transient information have been proposed, such as high-frequency component [13], wavelet transform [14,15], neural network [16], expert system [17], extreme learning machine [18], zero-sequence reactive power method [19], transient energy method [20,21] etc. Moreover [22] and [23] discussed synthesis algorithms for FLS.…”

Section: Introductionmentioning

confidence: 99%

Research on a Faulty Line Selection Method Based on the Zero-Sequence Disturbance Power of Resonant Grounded Distribution Networks

et al. 2019

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For fast and accurate faulty line selection (FLS) in single phase-to-ground (SPG) faults for resonant grounded distribution networks (RGDNs), this paper proposes a FLS method based on zero-sequence power characteristics. Through analysis of the zero-sequence current of SPG faults, it is found that the transient zero-sequence current in the faulty line contains abundant attenuated DC components, while that in the sound line is weak, which could be utilized as a technically practical way of judging faulty lines. Thus a FLS scheme using a transient zero-sequence DC component energy integral is put forward, which highlights the difference of the DC components in the faulty line and the sound line. A series of simulation test results indicate that the proposed scheme shows favorable performance under various SPG fault conditions, and should be helpful to improve the success rate of FLS significantly for RGDN in the future.

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Mathematical morphology‐based single phase‐to‐ground fault feeder selector for a resonant grounded distribution system

Cited by 4 publications

References 3 publications

Fault Feeder Identification in Non-effectively Grounded Distribution Network with Secondary Earth Fault

Fault Feeder Identification in Non-effectively Grounded Distribution Network with Secondary Earth Fault

Location for single‐phase grounding fault in distribution network based on equivalent admittance distortion rate

Research on a Faulty Line Selection Method Based on the Zero-Sequence Disturbance Power of Resonant Grounded Distribution Networks

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