Single-phase ground fault location method for distribution network based on traveling wave time-frequency characteristics

Traveling wave (TW)-based fault-location methods have been used to determine single-phase-to-ground fault distance in power-distribution networks. The previous approaches detected the arrival time of the initial traveling wave via single ended or multi-terminal measurements. Regarding the multi-branch effect, this paper utilized the reflected waves to obtain multiple arriving times through single ended measurement. Potential fault sections were estimated by searching for the possible traveling wave propagation paths in accordance with the structure of the distribution network. This approach used the entire propagation of a traveling wave measured at a single end without any prerequisite of synchronization, which is a must in multi-terminal measurements. The uniqueness of the fault section was guaranteed by several independent single-ended measurements. Traveling waves obtained in a real 10 kV distribution network were used to determine the fault section, and the results demonstrate the significant effectiveness of the proposed method.

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Online Method for Location of Single Phase to Ground Fault through Cement Pole in Distribution Network

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.494-495.1739 ◽

2014 ◽

Vol 494-495 ◽

pp. 1739-1742

Author(s):

Hong Yu Yang

Keyword(s):

Theoretical Analysis ◽

Distribution System ◽

Distribution Systems ◽

Fault Location ◽

Single Phase ◽

Distribution Network ◽

Voltage Gradient ◽

Simulation Experiments ◽

Location Method ◽

Ground Fault

In China,most of distribution system is neutral noneffectively grounded. And the single-phase fault often happens through cement pole. In this paper,firstly,the voltage of the fault phase and the current of cement pole are derived in 10kV neutral noneffectively grounded distribution systems when cement pole has single-phase ground fault.Secondly,the online fault location method is proposed based on voltage gradient of cement pole.Thirdly,the resistence characristic of cement pole is analyzed and the distance obtained from the gradient voltage of cement pole is given.Finally, the theoretical analysis and simulation experiments show that the method is feasible.

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A Distribution Network Fault Location Method Based on Reverse Wave and Wavelet Analysis

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.713-715.1369 ◽

2015 ◽

Vol 713-715 ◽

pp. 1369-1372

Author(s):

Xue Ming Zhai ◽

Huan Xia ◽

Long An

Keyword(s):

Generating Functions ◽

Fault Location ◽

Single Phase ◽

Travelling Waves ◽

Distribution Network ◽

Travelling Wave ◽

Location Method ◽

Ground Fault ◽

Modulus Maximum ◽

Network Fault

Based on the analysis of the transient process of the electric line’s developing ground fault, this paper applies the oppositely-directed travelling wave fault location method to fault location in distribution network. Simultaneously, this paper chooses proper wavelet generating functions to find the modulus maximum of oppositely-directed travelling waves and summarizes the methods and steps of this oppositely-directed travelling wave fault location. Finally, PSCAD/EMTDC is used to simulate the single-phase ground fault to verify the oppositely-directed travelling wave fault location method.

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The Research of C-Type of Traveling Wave for Fault Location in Distribution Network

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.516-517.1463 ◽

2012 ◽

Vol 516-517 ◽

pp. 1463-1468

Author(s):

Ya Nan Liu ◽

Feng Yan ◽

Qian Miao ◽

Jun Jiang ◽

Hai Mei Xu

Keyword(s):

Traveling Wave ◽

Fault Location ◽

Single Phase ◽

Simulation Experiment ◽

Distribution Network ◽

Normal Phase ◽

Location Method ◽

Reflection And Refraction ◽

Fault Locating ◽

Waveform Distortion

On the basis of analysis on difficulty of a single phase grounding fault locating in distribution network, a fault location method using C-type of traveling wave is put forward. The C-type of traveling wave location method is off-line. This location method can not be affected by the signal intensity of traveling wave when the fault is taking place and would be used repeatedly. As a result, the measure accuracy is guaranteed. Through the simulation to traveling wave’s process of reflection and refraction by ATP, the result what simulation experiment shows by putting up model of 10kV line with 3 branches single phase grounding fault, we can compare waveform of the normal phase and the fault phase to find the first waveform distortion point and determine the fault location. The fault location precision meets accuracy requirements, so it is feasible to locate the fault by using C-type of traveling wave location method.

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Research on Single-Phase Grounding Fault in Distribution Networks with a DC Power Positioning Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.530-531.353 ◽

2014 ◽

Vol 530-531 ◽

pp. 353-356

Author(s):

Run Sheng Li

Keyword(s):

Power Distribution ◽

Single Phase ◽

Distribution Network ◽

Distribution Networks ◽

Power Distribution Network ◽

Power Outage ◽

Location Method ◽

Fault Resistance ◽

Ground Fault ◽

Positioning Method

Due to the high ground fault resistance and the complexity of power distribution network structure (such as too many nodes, branches and too long lines), adopting common traveling wave method and ac injection method can not effectively locate the single-phase grounding fault in the distribution network system.To solve above problems and determine the position of the point of failure prisely, this paper adopted the dc location method of injecting the dc signal from the point of failure under the power outage offline. This paper introduces the single phase dc method and the method of three phase dc, and the simulation shows that the dc location method is effective and feasible.

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