scholarly journals Risk Analysis of Transmission Line Patrol Based on DEMATEL Method

CONVERTER ◽  
2021 ◽  
pp. 239-247
Author(s):  
Meiyu Li, Et al.
Keyword(s):  
Transmission Line ◽  
Influencing Factors ◽  
Transmission Lines ◽  
Analysis Method ◽  
Natural Risk ◽  
Four Dimensions ◽  
Maintenance Work ◽  
The Stability ◽  
Operation Risk ◽  
The Relationship

As the scale of power network construction increases, transmission lines that undertake transmission tasks are facing greater challenges in patrol and maintenance work. Therefore, analyzing the factors that affect transmission line patrol and maintenance has become an urgent problem in the power industry. This paper analyzes the influencing factors from the four dimensions of natural risk, transmission operation risk, transmission line risk, and other man-made risks, and uses the DEMATEL analysis method to identify the relationship between different factors, and obtains the key influencing factors, and then proposes Corresponding strategies to deal with the risk of transmission line patrol, hope to have a certain reference effect on the patrol work, so as to ensure the stability of transmission lines.

Study on the characteristics of secondary arc current of UHV high compensation degree TCSC line under the fine-tuning mode

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Baina He ◽  
Yadi Xie ◽  
Jingru Zhang ◽  
Nirmal-Kumar C. Nair ◽  
Xingmin He ◽  
...  
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Stability Margin ◽  
Transmission Capacity ◽  
Fine Tuning ◽  
Series Compensation ◽  
Arc Current ◽  
Compensation Device ◽  
The Stability ◽  
Recovery Voltage

Abstract In the transmission line, the series compensation device is often used to improve the transmission capacity. However, when the fixed series capacitor (FSC) is used in high compensation series compensation device, the stability margin cannot meet the requirements. Therefore, thyristor controlled series compensator (TCSC) is often installed in transmission lines to improve the transmission capacity of the line and the stability of the system. For cost considerations, the hybrid compensation mode of FSC and TCSC is often adopted. However, when a single-phase grounding fault occurs in a transmission line with increased series compensation degree, the unreasonable distribution of FSC and TCSC will lead to the excessive amplitude of secondary arc current, which is not conducive to rapid arc extinguishing. To solve this problem, this paper is based on 1000 kV Changzhi-Nanyang-Jingmen UHV series compensation transmission system, using PSCAD simulation program to established UHV series compensation simulation model, The variation law of secondary arc current and recovery voltage during operation in fine tuning mode after adding TCSC to UHV transmission line is analyzed, and the effect of increasing series compensation degree on secondary arc current and recovery voltage characteristics is studied. And analyze the secondary arc current and recovery voltage when using different FSC and TCSC series compensation degree schemes, and get the most reasonable series compensation configuration scheme. The results show that TCSC compensation is more beneficial to arc extinguishing under the same series compensation. Compared with several series compensation schemes, it is found that with the increase of the proportion of TCSC, the amplitude of secondary arc current and recovery voltage vary greatly. Considering various factors, the scheme that is more conducive to accelerating arc extinguishing is chosen.

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 Detection method based on improved faster R-CNN for pin defect in transmission lines

2021 ◽  
Vol 300 ◽  
pp. 01011
Author(s):  
Jun Wu ◽  
Sheng Cheng ◽  
Shangzhi Pan ◽  
Wei Xin ◽  
Liangjun Bai ◽  
...  
Keyword(s):  
Transmission Line ◽  
Defect Detection ◽  
Transmission Lines ◽  
False Positive Rate ◽  
Detection Algorithm ◽  
Detection Model ◽  
Positive Rate ◽  
Aerial Vehicle ◽  
The Stability ◽  
Small Targets

Defects such as insulator, pins, and counterweight in highvoltage transmission lines affect the stability of the power system. The small targets such as pins in the unmanned aerial vehicle (UAV) inspection images of transmission lines occupy a small proportion in the images and the characteristic representations are poor which results a low defect detection rate and a high false positive rate. This paper proposed a transmission line pin defect detection algorithm based on improved Faster R-CNN. First, the pre-training weights with higher matching degree are obtained based on transfer learning. And it is applied to construct defect detection model. Then, the regional proposal network is used to extract features in the model. The results of defect detection are obtained by regression calculation and classification of regional characteristics. The experimental results show that the accuracy of the pin defect detection of the transmission line reaches 81.25%

scholarly journals Analysis of Stability Factors of Roadway Roof and Determination of Unsupported Roof Distance

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Sen Yang ◽  
Xinzhu Hua ◽  
Xiao Liu ◽  
Chen Li
Keyword(s):  
Influencing Factors ◽  
Geological Conditions ◽  
Mine Roadway ◽  
Flac 3D ◽  
Roof Stability ◽  
Analysis Of Stability ◽  
The Stability ◽  
The Impact ◽  
The Relationship

To determine the impact of influencing factors on unsupported roof stability in coal mine roadway, a mechanical model of the unsupported roof was built. FLAC 3D numerical simulation was utilized to study the stability of the unsupported roof under the influence of the depth of the roadway, the thickness of the roof, and the unsupported-support distance. In view of the key influencing factors, the geological conditions of the site, and the relationship between the tensile stress and tensile strength of the unsupported roof, the maximum unsupported roof distance during roadway excavation was determined. Considering the surplus safety factor of the unsupported roof, the reasonable unsupported roof distance during the excavation of roadway 150802 was finally determined to be 2.08 m. The comprehensive roadway excavation speed increased by 62.7%, achieving a monthly progress over 500 m.

New Methodology of Fault Identifier for the Double Circuit Line on the same Tower

2014 ◽  
Vol 521 ◽  
pp. 330-333
Author(s):  
Yu Sheng Quan ◽  
En Ze Zhou ◽  
Hua Gui Chen ◽  
Xin Zhao
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Transmission Lines ◽  
Social Economy ◽  
Criterion Function ◽  
Transient Fault ◽  
Permanent Fault ◽  
Overhead Transmission Line ◽  
Practical Engineering ◽  
The Stability

High voltage overhead transmission line is an important part of the power system to ensure the safe operation of the entire power system, which is of great significance. Power line fault not only has adverse effects to the social economy, and it may also affect the stability of the power system. Transmission line faults including permanent fault and transient fault are identified quickly and accurately, which has important practical engineering significance. This paper presents a method which can be used to identify the permanent fault and transient fault of double-circuit transmission line on the same tower, fault transient voltages and currents extracted from both ends of transmission lines are as a signal source which is decomposed into a series of harmonics in order to establish a criterion function, and then the transient and permanent fault can be identified based on the changes of criterion function value.

Study on Assessment Model of Lightning Proof Abilities of HV Transmission Line Based on ArcGIS

2011 ◽  
Vol 383-390 ◽  
pp. 1174-1180
Author(s):  
Guo Fang Lai ◽  
Yan Fei Ji ◽  
Zhi Peng Gu ◽  
Gang Liu
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Electric Power System ◽  
Assessment Model ◽  
Analysis Method ◽  
Location Data ◽  
The Past ◽  
Great Relevance ◽  
The Pearl River ◽  
Insulation Condition

With the rapid growth of the national economy, the demand for electricity is increasing rapidly. In order to ensure electric power system operates safely and stably, much attention has been paid to insulation condition and lightning proof abilities of HV transmission lines. Nowadays the study of lightning protection of transmission line, which takes districts as the research object, has certain limitations. To provide a more rational basis for insulation design of the new transmission lines as well as insulation improvement in the old, this paper brings in a new analysis method based on ArcGIS. It is also taking the environmental factors, such as landscape along the transmission lines, into consideration. This method first filters and statistically analyzes lightning location data, and establishes assessment model of lightning proof abilities of transmission lines, which can serve as reference for finding the segment struck by lightning. In order to verify the feasibility of the model, this paper took a 220kV transmission line of a region in the Pearl River Delta as an example, and analyzed the distribution of parameters of lightning activities for the past decade. The result shows that the segments where flashover trip occurred have great relevance with the results of the data analysis. It is true that the model can be provided as a reference to the improvement of the insulation level of lines.

Study on Assessment Model of Lightning Proof Abilities of HV Transmission Line Based on ArcGIS

2012 ◽  
Vol 433-440 ◽  
pp. 3808-3814
Author(s):  
Guo Fang Lai ◽  
Yan Fei Ji ◽  
Zhi Peng Gu ◽  
Gang Liu
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Electric Power System ◽  
Assessment Model ◽  
Analysis Method ◽  
Location Data ◽  
The Past ◽  
Great Relevance ◽  
The Pearl River ◽  
Insulation Condition

With the rapid growth of the national economy, the demand for electricity is increasing rapidly. In order to ensure electric power system operates safely and stably, much attention has been paid to insulation condition and lightning proof abilities of HV transmission lines. Nowadays the study of lightning protection of transmission line, which takes districts as the research object, has certain limitations. To provide a more rational basis for insulation design of the new transmission lines as well as insulation improvement in the old, this paper brings in a new analysis method based on ArcGIS. It is also taking the environmental factors, such as landscape along the transmission lines, into consideration. This method first filters and statistically analyzes lightning location data, and establishes assessment model of lightning proof abilities of transmission lines, which can serve as reference for finding the segment struck by lightning. In order to verify the feasibility of the model, this paper took a 220kV transmission line of a region in the Pearl River Delta as an example, and analyzed the distribution of parameters of lightning activities for the past decade. The result shows that the segments where flashover trip occurred have great relevance with the results of the data analysis. It is true that the model can be provided as a reference to the improvement of the insulation level of lines.

KAPABILITAS KEWIRAUSAHAAN DAN KEMAMPUAN DINAMIS PERUSAHAAN: PERAN MEDIASI DARI PEMBELAJARAN ORGANISASIONAL

2014 ◽  
Vol 9 (2) ◽  
pp. 99
Author(s):  
Maria Pampa Kumalaningrum ◽  
Rahmat Purbandono
Keyword(s):  
Factor Analysis ◽  
Organizational Learning ◽  
Dynamic Capabilities ◽  
Analysis Method ◽  
Four Dimensions ◽  
Mediating Role ◽  
The Relationship ◽  
Mediator Variable ◽  
Positive Effect ◽  
Different Levels

Dynamic capabilities are regarded as a strategic premise to creating, maintaining and upgrading sustainable competitiveness. Considering organizational learning as a mediator variable, this study tests the relationship between entrepreneurial capabilities and dynamic capabilities. More specifically, the factor analysis method was employed to verify that dynamic capabilities are comprised of four dimensions, i.e. environmental sensing capabilities, change and renewal capabilities, technological and organizational flexibility capabilities. The research used UMKM in Yogyakarta and Solo as research sample. It was found that entrepreneurial capabilities has a significantly positive effect on dynamic capabilities, while organizational learning, which has significantly positive effect on dynamic capabilities, plays a partial mediating role between the two. These findings indicate that companies can build dynamic capabilities through different levels of organizational learning in the context of innovative and proactive atmosphere. Keywords: Entrepreneurial Capabilities, Organizational Learning, Dynamic Capabilities,

scholarly journals Multiresolution Time-Domain Scheme for Terminal Response of Two-Conductor Transmission Lines

2016 ◽  
Vol 2016 ◽  
pp. 1-15 ◽  
Author(s):  
Zongliang Tong ◽  
Lei Sun ◽  
Ying Li ◽  
Jianshu Luo
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Time Domain ◽  
Fdtd Method ◽  
Numerical Dispersion ◽  
Dispersion Property ◽  
Scaling Functions ◽  
Terminal Response ◽  
Lossy Transmission ◽  
The Stability

This paper derives a multiresolution time-domain (MRTD) scheme for the two-conductor lossless transmission line equations based on Daubechies’ scaling functions. And a method is proposed to generate the scheme at the terminal and near the terminal of the lines. The stability and numerical dispersion of this scheme are studied, and the proposed scheme shows a better dispersion property than the conventional FDTD method. Then the MRTD scheme is extended to the two-conductor lossy transmission line equations. The MRTD scheme is implemented with different basis functions for both lossless and lossy transmission lines. Numerical results show that the MRTD schemes which use the scaling functions with high vanishing moment obtain more accurate results.

AN INVESTIGATION OF THE STATISTICAL RELATIONSHIP BETWEEN THE 345 KV TRANSMISSION LINE LENGTH AND THE OUTAGE RATE

1994 ◽  
Vol 01 (01) ◽  
pp. 85-94
Author(s):  
SO YOUNG SOHN
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Electric Power Industry ◽  
Line Length ◽  
Influential Factors ◽  
Company Group ◽  
Group 2 ◽  
Log Linear ◽  
The Relationship ◽  
Group 1

Finding the factors that are related to varying transmission outage rates has been one of the major concerns of the reliability practitioners in the electric power industry. One of the potentially influential factors is the length of the transmission line. In this paper, a random effects Poisson regression model is used to quantify the relationship between the outage rate to the transmission line length. The method suggested is applied to analyze two sets of the 345 KV transmission line outage data of the Commonwealth Edison Company: group 1 contains transmission lines that had been installed before January 1974; group 2 consists of the lines that have been installed since January 1974. Results indicate that in both cases there is a significant log linear relationship between the transmission line outage and the line length. However, the annual outage rate elasticity of transmission lines of group 2 turns to be 0.33 while that of group 1 is 0.64. This would imply apparent quality improvement on the transmission lines in group 2.

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