High impedance fault analysis and location of single-phase-to-ground fault in feeder with multiple DGS connections

2019 ◽  
Author(s):  
Xuan Ren ◽  
Bin Wang ◽  
Xinzhou Dong
Keyword(s):  
Single Phase ◽  
Fault Analysis ◽  
High Impedance ◽  
Ground Fault ◽  
High Impedance Fault

scholarly journals Identifying Faulty Feeder for Single-Phase High Impedance Fault in Resonant Grounding Distribution System

Energies ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 598
Author(s):  
Tao Tang ◽  
Chun Huang ◽  
Zhenxing Li ◽  
Xiuguang Yuan
Keyword(s):  
Distribution System ◽  
Single Phase ◽  
Fault Resistance ◽  
High Impedance ◽  
Significant Difference ◽  
High Impedance Fault ◽  
Transition Resistance ◽  
Zero Sequence ◽  
High Impedance Faults ◽  
Zero Sequence Voltage

The identification of faulty feeder for single-phase high impedance faults (HIFs), especially in resonant grounding distribution system (RGDS), has always been a challenge, and existing faulty feeder identification techniques for HIFs suffer from some drawbacks. For this problem, the fault transient characteristic of single-phase HIF is analyzed and a faulty feeder identification method for HIF is proposed. The analysis shows that the transient zero-sequence current of each feeder is seen as a linear relationship between bus transient zero-sequence voltage and bus transient zero-sequence voltage derivative, and the coefficients are the reciprocal of transition resistance and feeder own capacitance, respectively, in both the over-damping state and the under-damping state. In order to estimate transition resistance and capacitance of each feeder, a least squares algorithm is utilized. The estimated transition resistance of a healthy feeder is infinite theoretically, and is a huge value practically. However, the estimated transition resistance of faulty feeder is approximately equal to actual fault resistance value, and it is far less than the set threshold. According to the above significant difference, the faulty feeder can be identified. The efficiency of the proposed method for the single-phase HIF in RGDS is verified by simulation results and experimental results that are based on RTDS.

scholarly journals Analytical Model for High Impedance Fault Analysis in Transmission Lines

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
S. Maximov ◽  
V. Torres ◽  
H. F. Ruiz ◽  
J. L. Guardado
Keyword(s):  
Transmission Line ◽  
Analytical Model ◽  
Transmission Lines ◽  
Fire Hazard ◽  
Human Life ◽  
Electric Arc ◽  
Fault Analysis ◽  
Arc Model ◽  
High Impedance ◽  
High Impedance Fault

A high impedance fault (HIF) normally occurs when an overhead power line physically breaks and falls to the ground. Such faults are difficult to detect because they often draw small currents which cannot be detected by conventional overcurrent protection. Furthermore, an electric arc accompanies HIFs, resulting in fire hazard, damage to electrical devices, and risk with human life. This paper presents an analytical model to analyze the interaction between the electric arc associated to HIFs and a transmission line. A joint analytical solution to the wave equation for a transmission line and a nonlinear equation for the arc model is presented. The analytical model is validated by means of comparisons between measured and calculated results. Several cases of study are presented which support the foundation and accuracy of the proposed model.

Single-phase high-impedance fault protection for low-resistance grounded distribution network

2018 ◽  
Vol 12 (10) ◽  
pp. 2462-2470 ◽  
Author(s):  
Tao Tang ◽  
Chun Huang ◽  
Leng Hua ◽  
Jiran Zhu ◽  
Zhidan Zhang
Keyword(s):  
Single Phase ◽  
Distribution Network ◽  
Low Resistance ◽  
High Impedance ◽  
Fault Protection ◽  
High Impedance Fault

scholarly journals Covered conductor burn-down prevention for distribution line in Indonesia

2018 ◽  
Vol 197 ◽  
pp. 11003
Author(s):  
Putu Agus Aditya Pramana ◽  
Aristo Adi Kusuma ◽  
Buyung Sofiarto Munir ◽  
Handrea Bernando Tambunan
Keyword(s):  
Short Circuit ◽  
Short Circuit Current ◽  
Lightning Strike ◽  
Lightning Strikes ◽  
Protection Relay ◽  
High Impedance ◽  
Ground Fault ◽  
High Impedance Fault ◽  
Distribution Line ◽  
Transient Overvoltage

Covered conductor (CC) is used to resolve temporary line to ground fault in the distribution line. However, some cases of CC burn down were found in Indonesia. These phenomena were triggered by lightning strikes that cause transient overvoltage with a magnitude greater than basic insulation level (BIL) of insulator. Consequently, short circuit current will flow through the pinhole on CC. Burn down phenomena will create high impedance fault that is unable to be detected by protection relay, thus the conductor will remain energized and harmful to the surroundings. Therefore, this paper presents study about CC burn down prevention. The study was performed using transient simulation to find the effect of earth wire utilization against the transient overvoltage due to lightning strike. In addition, finite element simulation and laboratory testing were also performed to analyze the effect of power arc device on burn down prevention. The results show that the lightning strike with negative polarity will not cause transient overvoltage with a magnitude greater than the insulator BIL. However, if the lighting strikes have positive polarity then the insulator BIL will be potentially exceeded. Furthermore, the utilization of power arc device will prevent the CC burn down.

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