Comparison of transmission losses and voltage drops of GIL(Gas Insulated transmission line) and overhead transmission lines

2014 ◽  
Author(s):  
Danish Khan ◽  
Muhammad Rafiq ◽  
Syed Furqan Rafique ◽  
Idris Khan ◽  
Farukh Abbas
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Transmission Losses ◽  
Overhead Transmission Lines ◽  
Voltage Drops

scholarly journals Transient Temperature Calculation and Multi-Parameter Thermal Protection of Overhead Transmission Lines Based on an Equivalent Thermal Network

Energies ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 67 ◽  
Author(s):  
Jian Hu ◽  
Xiaofu Xiong ◽  
Jing Chen ◽  
Wei Wang ◽  
Jian Wang
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Transmission Lines ◽  
Calculation Method ◽  
Thermal Protection ◽  
Transient Temperature ◽  
Accurate Analysis ◽  
Temperature Calculation ◽  
Overhead Transmission Lines ◽  
Thermal Network

The overload degree of a transmission line is represented by currents in traditional overload protection, which cannot reflect its safety condition accurately. The sudden rise in transmission line current may lead to cascading tripping under traditional protection during power flow transfer in a power system. Therefore, timely and accurate analysis of the transient temperature rise of overhead transmission lines, revealing their overload endurance capability under the premise of ensuring safety, and coordination with power system controls can effectively eliminate overloading. This paper presents a transient temperature calculation method for overhead transmission lines based on an equivalent thermal network. This method can fully consider the temperature-dependent characteristics with material properties, convective heat resistance, and radiation heat and can accurately calculate the gradient distribution and response of the conductor cross-section temperature. The validity and accuracy of the proposed calculation method are verified by a test platform. In addition, a multi-parameter thermal protection strategy is proposed on the basis of the abovementioned calculation method. The protection can adequately explore the maximum overload capability of the line, and prevent from unnecessary tripping to avoid the expansion of accidents. Finally, the validity of the proposed protection is verified by the modified 29-bus system.

Lightning Overvoltage Analysis and Calculation of 330kV Overhead Transmission Line

2014 ◽  
Vol 556-562 ◽  
pp. 1588-1591
Author(s):  
Xiu Bin Zhang ◽  
Ding Jun Wen ◽  
Ya Ming Sun ◽  
Hong Gang Chen
Keyword(s):  
Transmission Line ◽  
Equivalent Circuit ◽  
High Voltage ◽  
Transmission Lines ◽  
Equivalent Circuit Model ◽  
Voltage Level ◽  
High Voltage Transmission Line ◽  
Overhead Transmission Line ◽  
Overhead Transmission Lines ◽  
Pollution Flashover

Lighting is one of the important reasons of transmission line trip accident. For 330kV and above ultra high voltage transmission line, lighting flashover more frequently occur. To reduce tripping rate effectively and fundamentally, lightning over voltage level should be analyzed besides anti-pollution flashover. In this paper, a simplified equivalent circuit model of a 330kV overhead transmission lines is established. The lightning over voltage of the transmission is analyzed and calculated. Method to reduce the lightning overvoltage is discussed.

scholarly journals Research on the decision of state maintenance for transmission line based on set pair analysis

2021 ◽  
Vol 71 (1&2) ◽  
pp. 17
Author(s):  
Shiyang Zhu ◽  
Le Wang
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Transmission Lines ◽  
Power Grids ◽  
Financial Control ◽  
Set Pair Analysis ◽  
Overhead Transmission Lines ◽  
Maintenance Work ◽  
Maintenance Decision ◽  
Pair Analysis

Overhead transmission lines are important parts of a power system; their operation state directly affects the reliability level of the entire power system. With the in-depth development of state maintenance work for power grids, correctly evaluating the reliability of overhead transmission lines is the key to successful maintenance. A maintenance decision model for transmission lines is established in this study based on set pair analysis to achieve human financial control and low maintenance efficiency. Full consideration is provided to the influence of environmental factors, and a theoretical basis for transmission line maintenance decision is established.

scholarly journals Mechanism Design and Analysis of a New Overhead Transmission Line Inspection Robot

2020 ◽  
Vol 38 (5) ◽  
pp. 1105-1111
Author(s):  
Yishuang Wang ◽  
Chao Yuan ◽  
Yongjie Zhai
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Simulation Analysis ◽  
Rapid Development ◽  
Frame Structure ◽  
Three Dimensional Model ◽  
Obstacle Crossing ◽  
Inspection Robot ◽  
Overhead Transmission Lines ◽  
Inspection Robots

The requirements of power system for the safety of overhead transmission lines are increasing. With the rapid development of mobile robot technology, the inspection of overhead transmission lines by inspection robots has become a research hotspot in recent years. Aiming at the task requirements of transmission line inspection robots and the environmental characteristics of transmission lines, researchers at home and abroad have developed a variety of inspection robots. However, most of these robots have problems such as inability to cross the strain tower, low obstacle crossing efficiency and poor safety. In order to solve the above problems, this paper proposes a new four-arm inspection robot mechanism. The robot can cross the strain tower with two different sets of arms working together. The rectangular frame structure on the walking arm improves the obstacle crossing efficiency of the robot, and the closed hanging mechanism ensures that the robot does not fall from the line. In this paper, the three-dimensional model of the robot is established, and the specific structure and motion parameters are given. Three typical obstacle-crossing modes are planned, and the motion analysis and force simulation analysis of the robot's obstacle-crossing process are carried out. The simulation result shows that the mechanism can efficiently cross the strain towers and common obstacles on the transmission line.

scholarly journals Non-Human-Machine Interaction for Power Transmission Lines Protection Design and Enhancement of Under Voltage Relay

2022 ◽  
Vol 05 (02) ◽  
pp. 26-40
Author(s):  
Abadal-Salam T. Hussain
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Fault Location ◽  
Short Circuit ◽  
Fault Classification ◽  
Design System ◽  
Human Machine Interaction ◽  
Matlab Simulink ◽  
Operation Conditions ◽  
Voltage Drops

The continuous monitoring of transmission line protection relay is desirable to ensure the system disturbance such as fault inception is detected in transmission line. Therefore, fault on transmission line needs to be detected, classified, and located accurately to maintain the stability of system. This project presents design enhancement and development under voltage relay in power system protection using MATLAB/Simulink. The under-voltage relay is a relay that has contacts that operate when voltage drops below a set voltage which is used for protection against voltage drops to detect short circuit and others. This study is carried out for all types of faults which only related with one of the parallel lines. For the overall of operation conditions, the sample data were generated for the system by varying the different fault types and fault location. This design system proposes the use of MATLAB/ Simulink based method for fast and reliable fault classification and location for a various type of fault.

scholarly journals Again about reliability characteristics of electrical power grids elements

2018 ◽  
Vol 58 ◽  
pp. 01002
Author(s):  
Abdula Abdurakhmanov ◽  
Sergey Glushkin ◽  
Vladislav Plotnikov ◽  
Andrey Shuntov
Keyword(s):  
Statistical Analysis ◽  
Transmission Line ◽  
Transmission Lines ◽  
Electrical Power ◽  
Power Grids ◽  
Overhead Transmission Line ◽  
Overhead Transmission Lines ◽  
Network Layout ◽  
Reliability Characteristics ◽  
Technical Solutions

The reliability characteristics of the (auto)transformers and overhead transmission lines of the unified national electric grid are subjected to statistical analysis. It is shown that their scheduled outages for scheduled or unscheduled repairs, as well as maintenance, weaken the network layout much more than emergency repairs. At the same time, there was a noticeable deterioration in the (auto)transformers and overhead transmission line reliability indexes over the last 30 years, which requires the development and adoption of appropriate organizational and technical solutions.

The System Structure Design and Test of Small UAV Airborne Pod

2014 ◽  
Vol 667 ◽  
pp. 425-429
Author(s):  
Jin Dong Wang ◽  
Hua Dong Yu ◽  
Jin Kai Xu ◽  
Bing Yan Chen
Keyword(s):  
Low Temperature ◽  
Theoretical Analysis ◽  
Transmission Line ◽  
Transmission Lines ◽  
Structure Design ◽  
System Structure ◽  
Ultrahigh Pressure ◽  
Overhead Transmission Lines ◽  
Small Uav ◽  
Pressure Transmission

According to operation requirement for overhead transmission lines inspection, designing and manufacturing the small UAV airborne pod system structure which has two axis three framework with spring damping system , assembling into the UAV for ultrahigh pressure overhead transmission lines inspection test. The test data showed that the accuracy of the small UAV airborne pod system stabilization met the requirement of transmission line inspection. The operation situation of transmission line and the growth situation of the trees around the transmission lines could be clearly observed. In order to quickly, effectively discover and eliminate ultrahigh pressure transmission line fault by providing clear image information, which had obvious superiority with the environment of high altitude and low temperature. The rationality of theoretical analysis and the practicability of transmission lines inspection for small UAV airborne pod system were verified.

Research on the Effect of Temperature to the Characteristic of Overhead Transmission Lines

2014 ◽  
Vol 711 ◽  
pp. 8-11
Author(s):  
Cheng Zhong Qu ◽  
Zhi Bo Xu ◽  
Ling Lu
Keyword(s):  
Economic Development ◽  
Energy Conservation ◽  
Transmission Line ◽  
Transmission Lines ◽  
Effect Of Temperature ◽  
Transport Capacity ◽  
Overhead Transmission Lines ◽  
Foreign Countries ◽  
Set Up ◽  
Original Line

With the economic development,the transport capacity of the existing transmission lines can not satisfy the demand for electricity. When the line needs expansion we propose to replace the new optional wire to reach the goal line expansion without changing the existing transmission line structures premise of the original line. We should consider energy conservation, temperature, security when running on N-1 and sag expansion to the main line. To satisfy these requirements, we set up the principle of development for the proper ties of the conductors to be developed and made assessment on the newly –developed conductors in China and foreign countries in recent years.

Preliminary Application of Terrestrial 3D LiDar in Corridor Defects Detection of Overhead Transmission Lines

2013 ◽  
Vol 718-720 ◽  
pp. 918-922
Author(s):  
Jin Mu Chen ◽  
Chun Lin Zhang ◽  
Ren De Wang ◽  
Xian Feng Lu ◽  
Wei Wang ◽  
...  
Keyword(s):  
Transmission Line ◽  
High Precision ◽  
Defect Detection ◽  
Transmission Lines ◽  
Detection Methods ◽  
Terrestrial Lidar ◽  
Overhead Transmission Line ◽  
Overhead Transmission Lines ◽  
3D Lidar ◽  
Preliminary Application

Based on a brief introduction of the operational principle of terrestrial 3D LiDar, this paper describes some typical defects detection methods of security distance in the overhead transmission line with living examples. These tests are realized by the Z+F Imager 5010 terrestrial 3D LiDar and Polyworks. The research results show that terrestrial LiDar technology can achieve the defect evaluation of defect detection of security distance in the overhead transmission lines. And this technology has many advantages, such as portable, security, intuitive and high precision.

scholarly journals OTL-Classifier: Towards Imaging Processing for Future Unmanned Overhead Transmission Line Maintenance

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1270 ◽  
Author(s):  
Fan Zhang ◽  
Yalei Fan ◽  
Tao Cai ◽  
Wenda Liu ◽  
Zhongqiu Hu ◽  
...  
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Error Rate ◽  
Industrial Development ◽  
Recall Rate ◽  
Binary Classifier ◽  
Overhead Transmission Line ◽  
Overhead Transmission Lines ◽  
Foreign Objects ◽  
Type Size

The global demand for electric power has been greatly increasing because of industrial development and the change in people’s daily life. A lot of overhead transmission lines have been installed to provide reliable power across long distancess. Therefore, research on overhead transmission lines inspection is very important for preventing sudden wide-area outages. In this paper, we propose an Overhead Transmission Line Classifier (OTL-Classifier) based on deep learning techniques to classify images returned by future unmanned maintenance drones or robots. In the proposed model, a binary classifier based on Inception architecture is incorporated with an auxiliary marker algorithm based on ResNet and Faster-RCNN(Faster Regions with Convolutional Neural Networks features). The binary classifier defines images with foreign objects such as balloons and kites as abnormal class, regardless the type, size, and number of the foreign objects in a single image. The auxiliary marker algorithm marks foreign objects in abnormal images, in order to provide additional help for quick location of hidden foreign objects. Our OTL-Classifier model achieves a recall rate of 95% and an error rate of 10.7% in the normal mode, and a recall rate of 100% and an error rate of 35.9% in the Warning–Review mode.

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