A new technique for setting distance protection and fault location by measurement of transmission line system impedance characteristics

2006 ◽  
Author(s):  
V. Sellwood
Keyword(s):  
Transmission Line ◽  
Fault Location ◽  
New Technique ◽  
Distance Protection ◽  
Line System ◽  
Impedance Characteristics ◽  
A New Technique

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

scholarly journals Mal-Operation of Mho Relay In Transmission Line Due To Presence of TCSC

2019 ◽  
Vol 8 (3) ◽  
pp. 4328-4333
Keyword(s):  
Transmission Line ◽  
Fault Location ◽  
Reactive Power ◽  
Power Transmission ◽  
Transmission System ◽  
Simulation Software ◽  
Normal Operation ◽  
Distance Protection ◽  
Voltage Profile ◽  
Angle Variation

Distance protection is simple and it provides fast response to clear the fault. Distance protection is also providing primary and remote backup function depending upon distance of transmission line. Distance protection uses various relays like mho relay/admittance relay, impedance relay and reactance relay. In power transmission system, Flexible AC Transmission System (FACTS) controllers are used to increase power transfer capability and reactive power control, but distance relay get affected due to presence of FACTS devices. This may create the stability issues, security and it may affect on voltage profile. The changes in impedance level would affect the accuracy of distance protection. This paper represents the effect of TCSC on operation of mho relay in transmission line. The work presented here emphasis on the interaction of TCSC on distance protection and their performances under different condition i.e., load angle variation, variation of SCL, different fault location. Design and control performance of MHO relay during normal operation as well as during variation in different condition is verified by using PSCAD simulation software.

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.

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

Development of Adaptive Distance Relay for STATCOM Connected Transmission Line with Wavelet Transform and ANN

2014 ◽  
Vol 705 ◽  
pp. 237-242
Author(s):  
Ramchandra P. Hasabe ◽  
Anil P. Vaidya
Keyword(s):  
Neural Network ◽  
Wavelet Transform ◽  
Transmission Line ◽  
Fault Location ◽  
Reactive Power ◽  
Distance Protection ◽  
Distance Relay ◽  
Protection Relay ◽  
Distance Protection Relay ◽  
Transmission Line Protection

A new scheme to enhance the solution of the problems associated with Transmission line protection with Statcom connected is presentedin this paper.Static Synchronous Compensator (STATCOM) is a shunt type FACTS device connected at the midpoint of the transmission line to maintain the voltage atdesired level by injecting/absorbing the reactive power. This connection affects the performance of distance protection relay during line faults. Thefault detectionis carried out byusingenergy of the detail coefficients of the phase signals and artificial neutral network algorithm used for fault distance location for all thetypes of faults for transmission line. For each type of fault separate neural network is prepared for finding out the fault location.

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