scholarly journals A New Technique for Location of Fault Location on Transmission Lines

2010 ◽  
Vol 4 (8) ◽  
Author(s):  
Khalaf Y. Alzyoud ◽  
Al-Mofleh Anwar ◽  
Faisal Y. Alzyoud
Keyword(s):  
Transmission Lines ◽  
Fault Location ◽  
New Technique ◽  
A New Technique

A new technique, based on voltages, for fault location on three-terminal transmission lines

1996 ◽  
Vol 37 (2) ◽  
pp. 143-151 ◽  
Author(s):  
J.F. Miñambres ◽  
I. Zamora ◽  
A.J. Mazón ◽  
M.A. Zorrozua ◽  
R. Alvarez-Isasi
Keyword(s):  
Transmission Lines ◽  
Fault Location ◽  
New Technique ◽  
A New Technique

A New Technique for Locating Coating Faults on Buried Metallic Pipelines

2008 ◽  
Vol 38 ◽  
pp. 113-120 ◽  
Author(s):  
Lucio Di Biase ◽  
Ranieri Cigna ◽  
Osvaldo Fumei
Keyword(s):  
Direct Current ◽  
Fault Location ◽  
New Technique ◽  
Research Centre ◽  
Voltage Gradient ◽  
Unique Method ◽  
Training And Research ◽  
Direct Current Voltage ◽  
A New Technique ◽  
External Corrosion

Among the specialized electrical surveys to search for coating faults, assess possible external corrosion conditions and verify Cathodic Protection effectiveness, DCVG (Direct Current Voltage Gradient) survey, and in particular the Transverse DCVG is usually considered the most effective technique for finding coating faults on transport pipelines for oil, gas, and water. In this paper some preliminary results are reported that show that using a.c. current instead of direct current the localization of the coating faults can be much more precise and simple to be performed at the same time. Compared with the DCVG, the ACVG has many advantages among which: it does not need ON/OFF cycles since the OFF conditions are almost constant in the absence of alternating stray currents, it can be carried out with economic and simple instrument, the use of unpolarizable reference electrodes (SCE) is not necessary and furthermore, it locates the faults and quantifies their importance with much more accuracy. Besides, the method needs shorter times and less manpower: one only operator is sufficient to perform the survey and it is therefore cheaper than performing DCVG. The results of the experiments carried out at the Training and Research Centre of Riyadh by comparing the results of the two methods using the same current densities, clearly show the different behaviour of the two techniques, in the presence of simulated / calibrated coating faults. Further researches are in course with this quite new technique as the localisation of coating faults is being made in terms of impedance rather than in terms of resistance. This has quite a huge implication when corrosion conditions of real coating faults are concerned. In case of a.c. interference (e.g. due to a.c. fed railways or electricity power lines) this could be a unique method able to locate corroding coating faults on a buried, interfered metallic pipeline. The method is being patented not only as a new technique for coating fault location, but also for its promising further developments still under investigation, as capable of finding corroding faults in case of a.c. interference.

Voltage Profile Enhancement using fuzzy self-tuned STATCOM

2018 ◽  
Vol 1 (1) ◽  
pp. 38-35
Author(s):  
Dr. Abdelelah K. Mahmood ◽  
Dr. Inaam A. Ali ◽  
Ayad A. ALGailany
Keyword(s):  
Transmission Lines ◽  
Industrial Development ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Electrical Energy ◽  
Pi Controller ◽  
New Technique ◽  
Voltage Profile ◽  
Self Tuning ◽  
A New Technique

Recently, the demand on electrical energy is growing day by day as a result of rapid industrial development so that it is making the transmission lines more exhausted and affected especially the voltage stability. In order to overcome these problems, a FACTs device STATCOM of 12 pulse two levels is used to increase the capability of transmission lines and improving the voltage profile of the system. In this work, a new technique of fuzzy self-tuning is used in STATCOM's controller where the parameters of PI controller tuned online that is lead to improve the voltage profile when the power system exposed to the abnormal condition. The simulation results of STATCOM with tuned fuzzy-PI controller show an enhancement in voltage profile under many disturbances as compared with the system used STATCOM without this new technique. The results show a voltage profile using fuzzy-PI less over shoot and reach to steady state efficient than conventional PI. The results of total harmonic distortion (THD) show low values due to application of the Sinusoidal Pulse Width Modulation (SPWM) technique and assuming the loads are linear.

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