scholarly journals Recovery time reduction of a damaged 6-35 kV transmission line after double earth fault applying the iteration fault location method

2018 ◽  
Vol 58 ◽  
pp. 01007 ◽  
Author(s):  
A.L. Kulikov ◽  
V.J. Osokin ◽  
M.D. Obalin
Keyword(s):  
Transmission Line ◽  
Power Supply ◽  
Recovery Time ◽  
Fault Location ◽  
Power Transmission ◽  
Power Transmission Line ◽  
Calculation Error ◽  
Location Method ◽  
Medium Voltage ◽  
Phase Coordinates

The task of determining the fault location on a power line is difficult and the longest operations to restore damaged areas of the network. Determining fault location with double earth faults is a priority due to the high wear of medium voltage networks and the absent of currently accurate algorithms. The usage of the phase coordinates method allows to obtain the calculated relations for determining the distances to the nearest and furthest point of damage. A significant increase in the accuracy is achieved by using iterative recalculation, the essence of which is to rectify such parameters as the transient resistance, the voltage at the neutral point of the load and the distance to the damage. The proposed algorithms allow reducing the calculation error and reducing the bypass zone of the damaged line, which in turn determines the power transmission line recovery time and increases the reliability of the power supply network.

Fault Location Scheme for Transmission Lines Using Kaiser Self-Convolution Windowed FFT Phase Comparison

2014 ◽  
Vol 596 ◽  
pp. 659-663
Author(s):  
Guo Chen Fan ◽  
Yong Li Zhu ◽  
Hong Wei Yan ◽  
Yan Feng Gao
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Fault Location ◽  
Power Transmission ◽  
Phase Spectrum ◽  
Power Transmission Line ◽  
Excellent Performance ◽  
Location Accuracy ◽  
Spectral Leakage ◽  
Convolution Window

In order to improve the fault location accuracy, and eliminate the influence of spectral leakage in power transmission line fault location, we proposed a novel fault location scheme for transmission lines based on multi-measurements and phase comparison with Kaiser self-convolution windows FFT, which can locate the fault between two adjacent towers in the fault-prone segment. It is based Kaiser self-convolution window's excellent performance of leakage suppression, which can effectively solve the phase current fault component is relatively large errors due to spectral leakage problem. Firstly, this paper analyzes the causes of the phase spectrum leakage, then elaborates the sidelobe characteristics of Kaiser self-convolution window, and lists phase comparative fault location using steps, finally, verifies the correctness of the proposed method by simulation. The results show that the proposed method can effectively suppress spectral leakage, has a high location accuracy, a wide applicability and its solving of phase difference is precise.

Improvement of External and Traction Power Supply System’s Efficiency by Normalizing the Schemes

2021 ◽  
Vol 64 (4-5) ◽  
pp. 72-78
Author(s):  
Nikolai Grigoriev ◽  
◽  
Ivan Ignatenko ◽  
Vladimir Kovalev ◽  
Polina Trofimovich ◽  
...  
Keyword(s):  
Transmission Line ◽  
Power Supply ◽  
Power Transmission ◽  
Power Transmission Line ◽  
Electric Transmission ◽  
Traction Network ◽  
Traction Substations ◽  
Traction Power Supply ◽  
Supply Systems ◽  
Traction Power

The article deals with improvement off the efficiency of external and traction power supply systems using for example indicators of traction substations for a real electric transmission line segment of a traction network of 25 kV. The analysis of the functioning of a real section of electrified railways with traction substations, two of which are connected according to the "feeding" scheme is providing in the article. The currents in the wind-ings of traction transformers are calculate for these substations. The proportion of the currents values of the most loaded winding to the two less loaded is 2: 1. The coefficient asymmetry of currents of transformer wind-ings operating on existing traction substations is equal to 1. The results prove a significant currents asymmetry of transformers windings and phases of electric transmission lines which leads to an increasing voltage unbal-ance. New schemes for connecting traction substations for the considered section of electrified railways have been developed in order to improve the quality indicators of electrical energy. New connection schemes for three traction substations, determined according to the requirements for connecting to the external and trac-tion power supply system are presents in the article. The calculation for new schemes of connecting traction substations, similar to the previously considered option, has been performed. The values of winding currents, power transmission line phases and coefficient asymmetry were obtained for new substation connection schemes. The proposed schemes for connecting traction substations provide a decrease in the coefficient asym-metry of the winding currents from 1 to 0.5 and a decrease in the current modulus in the most loaded windings by 1.5 times. New schemes for connecting traction substations reduce the currents of the most loaded windings and phases of the power transmission line, as well as the asymmetry of currents, which ensures an improvement in the efficiency of the external and traction power supply systems of the real traction network.

DESIGH CALCULATION OF A POWER TRANSMISSION LINE WITH TWO-WAY POWER SUPPLY

2017 ◽  
Vol 3 (54) ◽  
pp. 117-122
Author(s):  
Pavel O. Gukov ◽  
◽  
Dmitriy N. Afonichev ◽  
Sergey N. Pilyaev ◽  
◽  
...  
Keyword(s):  
Transmission Line ◽  
Power Supply ◽  
Power Transmission ◽  
Power Transmission Line
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