scholarly journals The Transmission of Bulk Power Over Long Distances

1990 ◽  
Vol 14 (1) ◽  
pp. 25-37
Author(s):  
M. Hamed
Keyword(s):  
Theoretical Analysis ◽  
Circular Plate ◽  
Transmission Lines ◽  
Power Transmission ◽  
Mutual Effect ◽  
Maximum Power ◽  
Long Distance ◽  
Capacitive Effect ◽  
Bulk Power ◽  
Power Limit

Circular, plate, radial and coaxial arrangements for phases of double circuit transmission lines are proposed. Power transmission over long distances depends on the mutual effect between each two respective phases. A theoretical analysis for voltage, power and current along such lines is presented. The general constants for each configuration are evaluated, as well as the maximum power limit for long distance double circuit transmission lines. Different voltage levels of 500 and 1000 kV are considered for a length of 1000 km. An external impedance is suggested to be connected at various points of coaxial arrangement with separate phases. The capacitive effect for such an external impedance is studied.

Development of On-line Integrated Stability Control System (ISC) for Long-distance Bulk Power Transmission

2013 ◽  
Vol 133 (4) ◽  
pp. 313-323 ◽  
Author(s):  
Kuniaki Anzai ◽  
Kimihiko Shimomura ◽  
Soshi Yoshiyama ◽  
Hiroyuki Taguchi ◽  
Masaru Takeishi ◽  
...  
Keyword(s):  
Control System ◽  
Power Transmission ◽  
Stability Control ◽  
Long Distance ◽  
Stability Control System ◽  
On Line ◽  
Bulk Power

scholarly journals An Optimized Coordination Strategy between Line Main Protection and Hybrid DC Breakers for VSC-Based DC Grids Using Overhead Transmission Lines

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1462 ◽  
Author(s):  
Zheng ◽  
Jia ◽  
Gong ◽  
Zhang ◽  
Pei
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Short Circuit ◽  
Power Grids ◽  
Fault Line ◽  
Long Distance ◽  
Coordination Strategy ◽  
Overhead Transmission Lines ◽  
Depth Analysis ◽  
Dc Breaker

Compared with alternating current (AC) power grids, the voltage-sourced converter (VSC)-based direct current (DC) grid is a system characterized by “low damping”, as a result, once there is a short-circuit fault on the DC transmission line, the fault current will rise more sharply and the influence range will be much wider within the same time scale. Moreover the phenomenon that a local fault causes a whole power grid outage is more likely to occur. Overhead transmission lines (OHLs) have been regarded as the mainstream form of power transmission in future high-voltage, large-capacity and long-distance VSC-based DC grids. However, the application of overhead transmission lines will inevitably lead to a great increase in the probability of DC line failure. Therefore, research on how to isolate the DC fault line quickly is of great significance. Based on the technology route for fault line isolation using DC breakers, on the basis of in-depth analysis of traditional coordination strategy, an optimized coordination strategy between line main protection and a hybrid DC breaker for VSC-based DC grids using overhead transmission lines is proposed in this paper, which takes the start-up output signal of line main protection as the pre-operation instruction of the corresponding hybrid DC breaker. As a result, the risks of blockage of the modular multilevel converter (MMC) closer to the fault position and of damage to power electronic devices in main equipment can be reduced effectively. Finally, the proposed coordination strategy was verified and analyzed through simulation.

scholarly journals A Study for the Measurement of the Minimum Clearance Distance between the 500 kV DC Transmission Line and Vegetation

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2606
Author(s):  
Kumail Kharal ◽  
Chang-Hwan Kim ◽  
Chulwon Park ◽  
Jae-Hyun Lee ◽  
Chang-Gi Park ◽  
...  
Keyword(s):  
High Voltage ◽  
Transmission Lines ◽  
Power Transmission ◽  
Electrical Power ◽  
Long Distance ◽  
Dc Voltage ◽  
Hvdc Transmission ◽  
High Voltage Direct Current ◽  
Dc Line ◽  
Pass Through

High voltage direct current (HVDC) transmission is being widely implemented for long-distance electrical power transmission due to its specific benefits over high voltage alternating current (HVAC) transmission. Most transmission lines pass through forests. Around the HVDC lines, an arc to a nearby tree may be produced. Thus, there should be a minimum possible clearance distance between a live conductor and a nearby tree, named the minimum vegetation clearance distance (MVCD), to avoid short-circuiting. Measurement of minimum clearance distance between the conductor and trees is a significant challenge for a transmission system. In the case of HVAC transmission, a large amount of research has been undertaken in the form of the Gallet equation for the measurement of this distance, whereas for HVDC transmission no substantial work has been done. An equivalent AC voltage value can be derived from the DC voltage value in order to use the Gallet equation. This paper presents an experimental measurement technique for determining the MVCD at 500 kV to verify the results obtained from the Gallet equation in the case of DC voltage. Performing the experiment with a 500 kV DC line is not possible in the laboratory due to safety concerns. Therefore, an experiment up to 60 kV is conducted to measure the MVCD for DC voltage. The measured results achieved from the experiment are then extrapolated to calculate the MVCD at 500 kV.

Extra Long-Distance Bulk Power Transmission

2011 ◽  
Vol 26 (3) ◽  
pp. 1440-1448 ◽  
Author(s):  
Robson Dias ◽  
Antonio Lima ◽  
Carlos Portela ◽  
Maurício Aredes
Keyword(s):  
Power Transmission ◽  
Long Distance ◽  
Bulk Power

Based on the TLM Method 1000kV UHV Transmission Line Performance Analysis

2011 ◽  
Vol 383-390 ◽  
pp. 2917-2922
Author(s):  
Feng Xia Li ◽  
Yue Long Wang
Keyword(s):  
Performance Analysis ◽  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Transmission Power ◽  
Long Distance ◽  
Transmission Distance ◽  
Transmission Line Modeling ◽  
Tlm Method ◽  
Ac Transmission

The TLM model of 3 - phase pow er t ran sm ission line is developed. Appling the transmission line modeling (TLM) method to analysis 1000kV ultrahigh voltage( UHV) AC transmission line, the obtained results prove that it is economical and reasonable to transmit the natural power by power transmission, and the transmission lines is a long-distance transmission power ; but both the super power and the power transmission, the transmission power reduce with the increase of transmission distance.

scholarly journals Construction Management of EVH & UVH Transmission Lines A Practical Guide

2020 ◽  
Vol 5 (8) ◽  
pp. 299-306
Author(s):  
Biswanath Sahu
Keyword(s):  
Power Generation ◽  
Transmission Lines ◽  
Construction Management ◽  
Power Transmission ◽  
Rail Transport ◽  
Practical Guide ◽  
Bulk Power ◽  
Uhv Transmission Lines ◽  
Made In

Generation projects are generally located in areas nearer to availability of inputs required for power generation such as water, coal, approach roads and having rail transport facilities. The load centers are at different locations depending its own convenience load requirement. Hence there is necessity of transmission of bulk power from generation sites to load or consumer points. Hence the utility of power transmission through EHV/UHV transmission lines. Further for transmission of bulk power from one region of country to another region also warrants establishment of Transmission lines. The technical as well as social and commercial criteria are very important while construction and erection of EHV and UHV transmission lines. These issues are of public as well as organization importance and hence efforts have been made in this presentation to elaborate in detail.

scholarly journals Corona Loss Minimization on High Voltage Transmission Line Network using Bundled Conductors.

2020 ◽  
Vol 9 (3) ◽  
pp. 887-891
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Hessian Matrix ◽  
Electrical Power ◽  
Power Transmission Lines ◽  
Long Distance ◽  
Power Stations ◽  
Line Network ◽  
Corona Losses

Electrical power generated and transmitted at a long distance away from the power stations is usually affected by inherent transmission line losses. The Ohmic and Corona losses which are predominantly common in power transmission lines are considered in this paper. These two losses are mathematically modeled with and without embedded bundled conductors. The resultant model which is a non-linear multivariable unconstrained optimized equation is minimized using the Hessian matrix determinant method for stability test purposes. The results obtained show that corona losses are minimized with embedded bundled conductors at a very low current value with large spacing distance between the bundled conductors. The decrease in the corona loss which is a consequence of spacing adjustment of the 2, 3, and 4 strands of bundled conductors was plotted using MATLAB 7.14. The plots obtained are in conformity with the inverse relation between corona loss and conductor spacing.

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