Faulty phase recognition method based on phase-to-ground voltages variation for neutral ungrounded distribution networks

Fan, Bo; Yao, Ganzhou; Wang, Wen; Yang, Xin; Ma, Haihang; Yu, Kun; Zhuo, Chao; Zhang, Xiangjun

doi:10.1016/j.epsr.2020.106848

Cited by 19 publications

(11 citation statements)

References 19 publications

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“…The phase angle of the lineto-line voltage E AB is set as the reference angle, which is not affected by the asymmetry of the line impedance, the operation of loads and the occurrence of the SLG fault. Secondly, a value of 15% rated phase voltage is set as a threshold to indicate an SLG fault [26], [27]. If the magnitude of the neutral voltage exceeds the threshold, it is claimed that an SLG fault occurs.…”

Section: Faulty Phase Identification Methods and Its Implementationmentioning

confidence: 99%

Faulty Phase Detection Method Under Single-Line-to-Ground Fault Considering Distributed Parameters Asymmetry and Line Impedance in Distribution Networks

Wang

Gao

Fan

et al. 2022

IEEE Trans. Power Delivery

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Accurate faulty phase detection under single-line-toground (SLG) fault is the basis of the emerging voltage-based fault arc suppression technology. Most conventional faulty phase recognition criteria assume the distributed line-to-ground parameters are symmetrical, therefore suffering invalidity in actual distribution networks especially under high-resistance ground-fault conditions. This paper firstly analyzes the magnitude and phase angle variation models of the phase-to-ground voltages before and after the SLG fault. Considering the asymmetrical distributed parameters and the line impedance, the specific phaseto-ground voltage variation rules corresponding to SLG fault on each phase are then discussed. Based on the voltage variation rules, a robust and practical method for faulty phase identification is proposed ， which does not need the distributed parameters. Finally, the correctness of the variation rules and the availability of the proposed method is verified by simulation. Comparative study shows the proposed method has better accuracy and applicability with the conventional methods when the asymmetry and ground-fault resistance are high.

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Section: Faulty Phase Identification Methods and Its Implementationmentioning

confidence: 99%

Faulty Phase Detection Method Under Single-Line-to-Ground Fault Considering Distributed Parameters Asymmetry and Line Impedance in Distribution Networks

Wang

Gao

Fan

et al. 2022

IEEE Trans. Power Delivery

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“…For potential practical application, it should be noted that the hybrid ASD mainly focuses on the full compensation of grounding fault current, while the recognition of faulty state is fully and precisely accomplished before the hybrid ASD takes actions [21].…”

Section: Methodsmentioning

confidence: 99%

“…11. First, when the neutral point displacement voltage exceeds 15% of nominal phase voltage, an SLG fault is confirmed and the faulty phase is identified [21]. Second, the corresponding multi-terminal breakers (refers to TABLE I) are closed for primarily regulating the zero-sequence voltage U N .…”

Section: Methodsmentioning

confidence: 99%

Principle and Control Design of a Novel Hybrid Arc Suppression Device in Distribution Networks

Fan

Yao

Wang

et al. 2022

IEEE Trans. Ind. Electron.

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A single line-to-ground (SLG) fault may lead to a more severe line-to-line fault and power supply interruption if the ground-fault current exceeds a certain value. Arc suppression device (ASD) is a good solution to eliminate the ground-fault current. A novel hybrid ASD is proposed in this paper, which consists of a passive device and an active one. The passive device utilizes multi-terminal breakers and an isolation transformer to couple a secondary voltage of a Zig-Zag grounding transformer to the neutral point to compensate the majority of the ground-fault current. The active device uses a single-phase voltage source inverter to eliminate the residual fault current due to the leakage inductance of the Zig-Zag grounding transformer in the passive device. A dual-loop voltage and current control method for the active device is designed for the accurate residual current compensation. Results of simulation and prototype experiment validate the effectiveness of the proposed hybrid ASD. The proposed hybrid ASD does not need to detect distributed line-to-ground parameters, and it has lower cost, less control complexity, higher reliability, and better performance, compared to other ASDs.

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“…In reference [11], the Clark Modal Transform (CMT) was used to extract the zero-sequence components from the three-phase voltages, combined with the voltage phase angle shift to determine the faulty phase in the 33-kV distribution system. To avoid the complicated selection process, Wang et al [12] determined the faulty phase based on the phase voltage variation after the injection of a compensation current at the neutral point in a distribution system with fully compensated arc suppression technology, while Fan et al [13] proposed a faulty phase recognition method based on phase-to-ground voltage variations, who analyzed the effects of system asymmetry and fault resistance in ungrounded distribution systems. All of the above methods are based on steady-state signals, where the selection of the faulty phase is achieved by the power frequency-based amplitude and phase characteristics of the voltage and current before and after the fault.…”

Section: Introductionmentioning

confidence: 99%

A Novel Faulty Phase Selection Method for Single-Phase-to-Ground Fault in Distribution System Based on Transient Current Similarity Measurement

et al. 2021

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In modern electrical power distribution systems, the effective operation of inverter-based arc suppression devices relies on the accuracy of faulty phase selection. In the traditional methods of faulty phase selection for single-phase-to-ground faults (SPGs), power frequency-based amplitude and phase characteristics are used to identify the faulty phase. In the field, when a high-resistance SPG occurs in the system, traditional methods are difficult for accurately identifying the faulty phase because of the weak fault components and complicated process. A novel realizable and effective method of faulty phase selection based on transient current similarity measurements is presented when SPGs occur in resonantly grounded distribution systems in this paper. An optimized Hausdorff distance matrix (MOHD) is proposed and constructed by the transient currents of three phases’ similarity measurements within a certain time window of our method. This MOHD is used to select the sampling time window adaptively, which allows the proposed method to be applied to any scale of distribution systems. Firstly, when a SPG occurs, the expressions for the transient phase current mutation in the faulty and sound phases are analyzed. Then, the sampling process is segmented into several selection units (SUs) to form the MOHD-based faulty phase selection method. Additionally, the Hausdorff distance algorithm (HD) is used to calculate the waveform similarities of the transient phase current mutation among the three phases to form the HD-based faulty phase selection method. Finally, a practical resonant grounded distribution system is modeled in PSCAD/EMTDC, and the effectiveness and performance of the proposed method is compared and verified under different fault resistances, fault inception angles, system topologies, sampling time windows and rates of data missing.

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Faulty phase recognition method based on phase-to-ground voltages variation for neutral ungrounded distribution networks

Cited by 19 publications

References 19 publications

Faulty Phase Detection Method Under Single-Line-to-Ground Fault Considering Distributed Parameters Asymmetry and Line Impedance in Distribution Networks

Faulty Phase Detection Method Under Single-Line-to-Ground Fault Considering Distributed Parameters Asymmetry and Line Impedance in Distribution Networks

Principle and Control Design of a Novel Hybrid Arc Suppression Device in Distribution Networks

A Novel Faulty Phase Selection Method for Single-Phase-to-Ground Fault in Distribution System Based on Transient Current Similarity Measurement

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