Single-phase-to-ground fault detection with distributed parameters analysis in non-direct grounded systems

Liu, Baowen; Ma, Hongzhong; Xu, Huiling; Ju, Ping

doi:10.17775/cseejpes.2016.00740

Cited by 23 publications

(16 citation statements)

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“…In [18], the faulty feeder was detected by traveling wave polarities of the post-fault current and voltage. In [19], new generation mechanisms of the zero-sequence voltage and residual current were proposed, and the faulty feeder was detected by an improved zero-sequence admittance method. In [20], a method based on the correlation dimension and average resistance was proposed to identify the cause of permanent SLG faults.…”

Section: Post-fault Bus Voltages ∆ / /mentioning

confidence: 99%

Single-Line-to-Ground Fault Location in Resonant Grounded Systems Based on Fault Distortions

Chen

Yin

et al. 2021

IEEE Access

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Under single-line-to-ground (SLG) faults, the voltages and currents in resonant grounded systems will inevitably be distorted. To locate the faults quickly and accurately, this paper proposes a location method based on fault distortions. The faulty phase is firstly detected according to the first SLG fault feature below, and then the faulty feeder and section are detected according to the second feature below. 1) On the bus, one of the following distortions occurs. One dropped faulty-phase voltage (FPV) and two raised normalphase voltages (NPVs). One dropped FPV and two NPVs (in which one rises and the other drops), where the product of FPV amplitude distortion and its phase-angle distortion is unique among three phase voltages. 2) On the faulty phase, the current on faulty feeder upstream rises, while the currents on faulty feeder downstream and normal feeders drop. Compared to existing methods, simulation tests show that the proposed method is robust under high impedance faults, and has a simple algorithm and easy engineering implementation. Also, it is effective under harmonics, three-phase imbalance, and different fault positions. INDEX TERMSFault distortions, fault location, single-line-to-ground faults, resonant grounded systems ACRONYMS SLG Single line to ground (F/N) PV (Faulty/Normal) phase voltage RGS Resonant grounded system ZSC Zero-sequence current FF (U/D) Faulty feeder (upstream/downstream) FPC Faulty phase current VFA Voltage fault area:

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Section: Post-fault Bus Voltages ∆ / /mentioning

confidence: 99%

Single-Line-to-Ground Fault Location in Resonant Grounded Systems Based on Fault Distortions

Chen

Yin

et al. 2021

IEEE Access

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“…From the simulation, the proposed method can be still effective even with 30dB noise. However, most of the methods [5], [7], [10], [13], [19], [20], [22] cannot work with such noise. Second, the proposed method is verified to be not affected by HIFs which commonly occur in the feeder when the feeder conductor makes electrical contact with poorly grounded objects.…”

Section: Comparison Workmentioning

confidence: 99%

“…Different from the active methods, the realtime measurements are utilized in the passive methods to achieve online faulty feeder detection, which leads to the promising applications of these methods. Based on the signal characteristics, the passive methods are further classified into two types: steady-state [5], [6] and transient methods [7]- [11]. The steady-state ones mainly utilize the difference of the amplitudes (or phases) of the steady-state currents, the polarities of the active or harmonic components [12], and zero-sequence admittances [13] between the faulty and sound feeders.…”

Section: Introductionmentioning

confidence: 99%

“…Although many faulty feeder detection methods have been proposed, some of them may require additional equipment [2]- [4], some of them do not consider the arc faults [5], [7], [10], [13], [19], some of them [6]- [11], [15]- [20] are susceptible to strong noise interference, and some others [21], [22] need substantial training samples. Besides, the method in [14] may be affected by system parameters, the methods in [7], [9], [10], [13] need to set thresholds to detect the faulty feeder, and the methods in [12] and [17] may be affected by the values of harmonic and active components.…”

Section: Introductionmentioning

confidence: 99%

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Single-Phase-to-Earth Faulty Feeder Detection in Power Distribution Network Based on Amplitude Ratio of Zero-Mode Transients

et al. 2019

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The single-phase-to-earth fault (SPTEF) current is weak in neutral ineffectively grounded systems. High fault impedance, noise and arc impair the fault feature, which increases the difficulty of faulty feeder detection. Based on the propagation characteristics of zero-mode transients (ZTs), this paper proposes a faulty feeder detection criterion by utilizing the amplitude information of the ZTs captured at both terminals. To conduct the criterion, the historical data of the ZTs recorded at both terminals of each feeder with a bus fault is collected. The standard amplitude ratios of the frequency components in the ZTs of each feeder are extracted by S-transform. After a SPTEF is detected in the system, the actual amplitude ratios of the ZTs are calculated and compared with the standard ones. Theoretical analysis and simulation indicate that the maximum ratio between the standard and actual ratios corresponds to the faulty feeder. In implementation of the criterion, both high sampling frequency and accurate synchronization are not required. A 10kV singleend radial distribution network is constructed by PSCAD/EMTDC. Various fault simulations are carried out and the calculation results demonstrate that the proposed criterion has high reliability and is not affected by neutral grounding mode, fault initial condition, high impedance fault (HIF) and noise.INDEX TERMS Zero-mode transients, amplitude ratio, faulty feeder detection, distribution network.

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“…The grounding grid provides a reference potential for the substation and discharges dangerous currents caused by lightning and short circuit of the power system to ensure the safety and stability of the power system [1]- [4]. However, due to the non-standard construction and poor working environment of the grounding grid, the grounding grid is susceptible to electrochemical and biological corrosion [5]- [7]. The corrosion makes grounding performance unable to meet the requirements for safe operation of the power system, posing a threat to the safety of the power system and personnel [8]- [10].…”

Section: Introductionmentioning

confidence: 99%

A Diagnosis of Grounding Grid Corrosion Defects Based on Branch Voltage Disturbance

Dong

Shi

et al. 2020

IEEE Access

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The grounding grid is the cornerstone for maintaining the safe operation of the power system. The grounding network acts as a concealed project, and its invisible characteristics make the defects difficult to be detected, which causes major safety hazards in the system. Thus accurate diagnosis of grounding grid corrosion is vital in electrical engineering. A diagnosis method for grounding grid corrosion based on branch voltage disturbance is proposed in this paper, which can judge the location and degree of corrosion through branch voltage disturbance before and after corrosion. Firstly, the sensitivity of branch voltage to branch resistance of the grounding grid is analyzed. Secondly, a diagnostic model based on branch voltage disturbance is established, and the corresponding regularity between peak voltage disturbance and the corrosion state of the grounding grid branch is developed. Finally, it is verified by experiments that this method can effectively diagnose the corrosion of the grounding grid.

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Single-phase-to-ground fault detection with distributed parameters analysis in non-direct grounded systems

Cited by 23 publications

References 0 publications

Single-Line-to-Ground Fault Location in Resonant Grounded Systems Based on Fault Distortions

Single-Line-to-Ground Fault Location in Resonant Grounded Systems Based on Fault Distortions

Single-Phase-to-Earth Faulty Feeder Detection in Power Distribution Network Based on Amplitude Ratio of Zero-Mode Transients

A Diagnosis of Grounding Grid Corrosion Defects Based on Branch Voltage Disturbance

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