Transmission line galloping induced dynamic strain measurement of an angle brace based power transmission tower by FBG sensors

2018 ◽  
Author(s):  
Kai Xie ◽  
Zhongbin Lv ◽  
Xing Zheng ◽  
Tao Tan ◽  
Hongying Zhang ◽  
...  
Keyword(s):  
Transmission Line ◽  
Strain Measurement ◽  
Power Transmission ◽  
Dynamic Strain ◽  
Transmission Tower ◽  
Fbg Sensors

Simulation and Experiential Research for Broken Conductor Load of Suspension Towers of UHVDC Power Transmission

2012 ◽  
Vol 249-250 ◽  
pp. 798-803
Author(s):  
Zi Fu Zhang ◽  
Zeng Lu Mo ◽  
Jing Du Geng
Keyword(s):  
Dynamic Response ◽  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Dynamic Strain ◽  
Power Transmission Lines ◽  
Transmission Tower ◽  
Research Results ◽  
Experiential Research ◽  
First Time

The breakage of conductor/ground wire seriously affects the secure operation of transmission line. According to the features of UHVDC power transmission lines, the broken conductor model for bundled conductors of continuous span is built and the broken conductor load is calculated; A simulating test was carried out the first time in China for a series of "broken conductor" events on one continuous span on the field to study the dynamic response of the transmission tower because of impact, then the dynamic strain and displacement were obtained. On the basis of the simulation and experiential research results, the paper discussed about the rational values of broken wire loads for the suspension towers of UHVDC.

scholarly journals Impact Identification for CFRP Foam-Core Sandwich Structures Using Dynamic Strain Measurement by Multiplexed FBG Sensors

2011 ◽  
Vol 59 (691) ◽  
pp. 212-221 ◽  
Author(s):  
Shu MINAKUCHI ◽  
Tadahito MIZUTANI ◽  
Nozomi AKINO ◽  
Nobuo TAKEDA ◽  
Hiroaki TSUTSUI ◽  
...  
Keyword(s):  
Strain Measurement ◽  
Sandwich Structures ◽  
Dynamic Strain ◽  
Foam Core ◽  
Fbg Sensors

scholarly journals Symmetrical Components of Transmission Line Parameters based on the Installed Tower Ground Resistivity

2020 ◽  
Vol 8 (6) ◽  
pp. 1987-1993
Keyword(s):  
Transmission Line ◽  
Distribution Systems ◽  
Power Transmission ◽  
Sea Water ◽  
Propagation Constant ◽  
Electric Power System ◽  
Transmission Tower ◽  
Earth Resistivity ◽  
Symmetrical Component ◽  
Regular Line

Transmission is a component of the electric power system alongside the generation and distribution systems. Effective and efficient planning is often required in system design and operation to ensure consistent and reliable supply of power to the Customers. Thus, transmission line parameters analysis needs to be carried out to ensure this proper planning. One of the crucial equipment used in transmission’s overhead lines is Tower supports which are of different configuration considering the Structural design, voltage ratings and current transmission. Very often, towers are randomly installed to carry lines of the chosen voltage and current rating without considering the effects of earth resistivity on which the tower is installed. This paper presents the transmission line symmetrical component parameters evaluation of a chosen Transmission tower. An algorithm was developed, and python software program was used to implement this algorithm for the analysis. In achieving target, the selected tower was imagined having been erected on six different earth resistivity ground which include, sea water, swampy ground, pure slate, sandstone and general average ground. Symmetrical component parameters evaluated includes impedance, characteristics impedance, propagation constant, shunt admittance and capacitive suceptances as they were found to be important in the effective monitoring of power transmission and distribution. The results of the analysis are presented and discussed. These results show that capacitive suceptances are independent on tower earth resistivity and vary for different tower structural configurations while other parameters vary with earth resistivity value of the tower. Furthermore, regular line parameters monitoring is a measure minimizing power transmission losses in networks

Design and Full-Scale Test for Steel Tubular Tower of UHV and EHV Quadruple-Circuit Transmission Line on the same Tower

2013 ◽  
Vol 732-733 ◽  
pp. 1045-1051 ◽  
Author(s):  
Qing Hua Li ◽  
Jing Bo Yang ◽  
Jun Ke Han
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
High Strength ◽  
Steel Tube ◽  
Full Scale ◽  
Full Scale Test ◽  
Transmission Tower ◽  
Wind Vibration ◽  
Scale Test

State Grid Corporation of China has carried out research on key technology of UHV&EHV AC and DC multi-circuit transmission lines, the research on material and structure of transmission tower is the important part. The SSZT2 tower, on which 1000 kV AC double-circuit and 500 kV AC double-circuit are arranged, is the largest power transmission capacity all over the world. Q420 high-strength tubular steel, the plug-in boards and forging flanges are used in SSZT2 tower,and the forging flange with strength classification is applied for the first time. Through the monographic study on the tower structures, wind vibration coefficient, and biaxial bending of steel tube etc. The success of full-scale test verified the reliability in design and manufacture of multi-circuit steel tubular tower for UHV and EHV. Research results of this paper can be applied in UHV transmission line projects.

The Analysis of Galloping-Endurance Character of 500kV Power Transmission Tower

2013 ◽  
Vol 333-335 ◽  
pp. 2123-2129
Author(s):  
Xiao Hui Yang ◽  
Bo Zhang ◽  
Wen Juan Lou ◽  
Zheng Cai Fu
Keyword(s):  
Dynamic Response ◽  
Transmission Line ◽  
Power Transmission ◽  
Power Grid ◽  
Endurance Performance ◽  
Ice Thickness ◽  
Transmission Tower ◽  
Laboratory Modeling ◽  
Maximum Loading ◽  
Vibration Model

With transmission line galloping occurring frequently in recent years, the phenomenon of tower damaged by galloping has become more and more serious, even with the whole tower collapsed during galloping. According to the statistic and analysis on the towers in 500kV transmission line of Henan power grid, which had been damaged by the galloping accidents in the winter of 2009 to 2010, The galloping section of 500kV Kai-Xiang Line with the typical impaired character had been selected for laboratory modeling and test. Through a series of tests, the maximum loading position and the vibration model for tower had been found, and the changing character of towers dynamic response with ice thickness, galloping amplitude and frequency analyzed. The loading-endurance character of rod and bolts joint, as the major components of tower, had been tested and analyzed respectively. The bolts joints, had been proved as the weakest point for galloping-endurance performance of the whole tower. The study stated in this paper would provide guidance and suggestion to the alteration on galloping prevention and controlling for transmission line. It was also shown that, developing the study on the locking performance of bolts joints on tower is quite essential.

scholarly journals Experimental Study on High-Cycle Fatigue Behavior of GFRP-Steel Sleeve Composite Cross Arms

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Jiantao Wang ◽  
Ning Tan ◽  
Shiming Zhou ◽  
Qing Sun
Keyword(s):  
Experimental Study ◽  
High Cycle Fatigue ◽  
Power Transmission ◽  
Fatigue Behavior ◽  
Fatigue Loading ◽  
Dynamic Strain ◽  
Cycle Fatigue ◽  
Transmission Tower ◽  
New Type ◽  
Steel Sleeve

To overcome the fatigue safety problem of transmission tower cross arms caused by the wind-induced vibrations, an experimental study on the high-cycle fatigue performance of a new type of GFRP-steel sleeve composite cross arms was carried out. A total of six specimens were subjected to 500 thousand cyclic loadings based on the practical engineering background. The stress state was monitored, and a variety of load-displacement-time curves, the energy dissipation capacity, and the dynamic strain were analyzed to examine the effects of fatigue loading. After the fatigue test, the specimens without significant fatigue failure were evaluated to derive the residual bearing capacity. Based on the residual strength theory, the cumulative damage was examined, and the fatigue life was predicted under various loading conditions to ensure the reliability of composite cross arms. It is shown that the new type full-scale GFRP-steel sleeve composite cross arms can demonstrate a high level of safety redundancy on antifatigue performance and can be expected for wide application in power transmission towers.

scholarly journals Effects of Ground Resistivity and Tower Structural Design on Transmission Line Symmetrical Components

2020 ◽  
Vol 9 (1) ◽  
pp. 2115-2126
Keyword(s):  
Transmission Line ◽  
Electric Power ◽  
Transmission Lines ◽  
Structural Design ◽  
Power Transmission ◽  
Design Parameters ◽  
Transmission Tower ◽  
Electric Power Supply ◽  
Symmetrical Components ◽  
Transmission Towers

Electric power transmission towers are line support that exists in different structural configurations depending on the design. Parameters in consideration for the design include proposed voltage and current ratings to be carried by the tower, weight of aluminum conductor and the weight of concrete foundation on which the tower would be erected. It is often reported that ground resistivity of the ground on which an electric power transmission tower is erected has significant effects on earth faults and transmission losses on the line. This paper presents an investigation of the effects of ground resistivity and tower structural design on transmission line symmetrical components. Symmetrical component parameters’ evaluation of the transmission lines approach is considered the best option. Ten differently structured transmission towers were selected for the case study. The effects of installing these ten towers on each of the available ground resistivity types were examined. A modern computer software was developed in carrying out this investigation. The results are presented and discussed. It was observed that at each location of a tower, ground resistivity plays a vital role in measuring the performance of tower in an electric power supply stability and reliability

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