One Type Damper Used for Preventing Galloping of the Electric Power Line

2011 ◽  
Vol 374-377 ◽  
pp. 2057-2060
Author(s):  
Li Min Sun ◽  
Jing Chao Zou
Keyword(s):  
Transmission Line ◽  
Electric Power ◽  
High Speed ◽  
Power Transmission ◽  
Power Line ◽  
Power Transmission Line ◽  
Patent License ◽  
Electric Power Line ◽  
New Type ◽  
Overhead Power Line

When the power transmission line is covered with ice and snow in the winter, the galloping of power line often happens. A new type of damper used for preventing galloping of the electric power transmission line has been put forward and received patent license of China. The damper like fan blades, which can rotate about the axes of the power line at 360°, is fixed on the overhead power line. It hangs on the line when there is no wind. The blade rotates at high speed in the plane vertical to wind when there is wind, which results in a gyroscope. The theorem of angular momentum of a gyroscope is used in the design of the damper. Model tests of this kind of damper have been carried out and the results show that it is successful in preventing galloping of the cable model.

scholarly journals Electromagnetic pollution of near-Earth space by power line emission

2021 ◽  
Vol 7 (3) ◽  
pp. 105-113
Author(s):  
Vyacheslav Pilipenko ◽  
Eugeny Fedorov ◽  
Nikolay Mazur ◽  
Stanislav Klimov
Keyword(s):  
Transmission Line ◽  
Geomagnetic Field ◽  
Power Transmission ◽  
Line Emission ◽  
Power Line ◽  
Satellite Observations ◽  
Electromagnetic Response ◽  
Power Transmission Line ◽  
Earth Space ◽  
Near Earth Space

We present an overview, based on satellite observations at low Earth orbits, on electromagnetic radiation from ground power transmission lines at an industrial frequency 50–60 Hz. Particular attention has been given to Chibis-M and DEMETER satellite observations. The electric 40-cm antenna of the micro-satellite often recorded 50–60 Hz radiation (known as Power Line Emission (PLE)) when it flew over industrialized areas of the planet. The PLE spectral amplitude varied from 1.2 to 18 (μV/m)/Hz0.5, which corresponds to the electric field amplitude E~1 μV/m. We report results of numerical calculations of the electromagnetic response of the atmosphere and ionosphere to a large-scale surface emitter at a frequency of 50 Hz. According to simulation results, PLE with an intensity of ~1 μV/m observed on satellites in the nightside ionosphere at midlatitudes can be excited by an unbalanced current 8–10 A in a power transmission line above the earth's crust with conductivity of 10–3 S/m. At middle and low latitudes with an inclined geomagnetic field, the maximum response in the upper ionosphere to the transmission line radiation should be seen shifted equatorward, although this shift is less than that upon guidance by the geomagnetic field. The maximum amplitude of the electromagnetic response of the ionosphere to the power transmission line emission decreases for an inclined geomagnetic field, but insignificantly. To date, the PLE intensity in near-Earth space has turned out to be higher than the intensity of natural radiation in this range (Schumann resonances and ion whistlers), and continues to grow with the technological development of mankind.

scholarly journals Identification power line sections with increased electricity losses using sensors with Wi-Fi technology for data transmission

2020 ◽  
Vol 178 ◽  
pp. 01053
Author(s):  
A.V. Vinogradov ◽  
A.V. Bukreev ◽  
V.E. Bolshev ◽  
A.V. Vinogradova ◽  
M.O. Ward ◽  
...  
Keyword(s):  
Transmission Line ◽  
Data Transmission ◽  
Single Phase ◽  
Power Transmission ◽  
Power Line ◽  
Measured Data ◽  
Power Lines ◽  
Power Transmission Line ◽  
Central Unit ◽  
Three Phase

The article presents portable timers-electricity meters (PTEM) which are devices for examining 0.4 kV power lines. There are two developed several versions of the devices: single-phase PTEM used to examine single-phase branch lines to consumers, and three-phase PTEM used for any power line sections. Also, the method to identify sections of power lines with increased electricity losses by means of these devices is presented. The paper considers the application of the three-phase PTEM with Wi-Fi technology to transmit data. Up to six independent three-phase PTEMs with Wi-Fi technology can be installed at different points of the power transmission line and transmit measured data in real time to the central unit. The use of these devices allows determining both technological and commercial losses of electricity in different power line sections and draw conclusions about whether these losses are overestimated. On the basis of this, measures are taken to reduce losses.

scholarly journals A Design of a 345-kV Electric Power Transmission Line Interlinking Ramu and Rouna Grids in Papua New Guinea

2017 ◽  
Vol 87 ◽  
pp. 05003
Author(s):  
Francis Sakato ◽  
Joseph Fisher ◽  
Paul RP Hoole ◽  
Martin Anyi ◽  
Samuel RH Hoole
Keyword(s):  
Transmission Line ◽  
Electric Power ◽  
Papua New Guinea ◽  
Power Transmission ◽  
New Guinea ◽  
Power Transmission Line
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