Single phase to earth fault location method in distribution network based on signal injection principle

2011 ◽  
Author(s):  
Bai Yong ◽  
Cong Wei ◽  
Li Jiansheng ◽  
Ding Lei ◽  
Lu Qingdong ◽  
...  
Keyword(s):  
Fault Location ◽  
Single Phase ◽  
Distribution Network ◽  
Location Method ◽  
Earth Fault ◽  
Signal Injection

Study of Earth-Fault Location Method for Distribution Network Based on Transient Signal

2011 ◽  
Vol 105-107 ◽  
pp. 742-746
Author(s):  
Zhi Chao Huang ◽  
Yi Zhong ◽  
Cai Lin Li ◽  
Mu Liu ◽  
Sheng Zhen Yang
Keyword(s):  
Frequency Band ◽  
Fault Location ◽  
Characteristic Impedance ◽  
Distribution Network ◽  
Transient Current ◽  
Transient Signal ◽  
Location Method ◽  
Earth Fault ◽  
Current Energy ◽  
Feature Frequency

According to the generating process and propagation characteristics of earth-fault transient signal, an earth-fault location method for distribution network based on transient signal is presented. In the method, in order to change line characteristic impedance, a resonant filter circuit is paralleled in line segment border, so that it could cause transient current energy differences in feature frequency band on both sides of detection device. The location method achieves earth-fault area location through comparing transient current energy and energy attenuation coefficient in feature frequency band. The simulation test result shows that the method isn't influenced by distribution system grounded style, operation style and other factors and which could detect the earth-fault area rapidly and reliably in distribution network and has a high project application value.

Study on Single-Phase Earth Fault Location Method in Mine Non-Effectively Grounded Network Based on WAMS

2014 ◽  
Vol 602-605 ◽  
pp. 2110-2113
Author(s):  
Dan Lu ◽  
Jun Qiang Liu ◽  
Xiu Gang Yin
Keyword(s):  
Fault Location ◽  
Single Phase ◽  
Load Capacity ◽  
Logical Relationship ◽  
Location Method ◽  
Earth Fault ◽  
Zero Sequence ◽  
Supply Model ◽  
Relationship Of ◽  
New Location

In allusion to the low reliability and sensitivity of existing single-phase earth fault location method, this article proposed a new location method based on WAMS in mine non-effectively grounded network. It analyzed the logical relationship of zero-sequence current of each branch when single-phase earth fault occurred and deduced zero-sequence current formulae of each branch. The detailed description is given to calculating differential variable of zero-sequence current and explicating principle and realization of fault section location. The coal mine power supply model based on WAMS is introduced and the scheme was verified by simulation via MATLAB and calculation via Fast Fourier Transform. The results indicate that it avoids influences by load capacity and the voltage initial phase angle, then effectively enhances fault location reliability and sensitivity.

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

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.

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

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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