The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Electric power transmission lines span through wide geographical areas, experiencing different ambient conditions. Varying weather conditions along the length of the line introduce changing conductor temperatures and hence non-uniform distribution of line electrical parameters along its length. This non-uniform distribution of electrical parameters is expected to impact line power handling capabilities...
This paper presents a methodology to increase the transmission lines (TLs) capacity and, simultaneously, decrease the intensity of electric field produced by its conductors in the ground level. A methodology for ascertaining whether Corona Loss is within acceptable limits is also developed. Such method aims to improve the performance of the TLs and it is based on analytical electromagnetic modeling...
For the transmission of electricity across long distances, high voltage direct current (DC) transmission is discussed in Germany as an alternative to the currently used alternating current (AC) as it is more efficient for these distances. Changes in energy infrastructure are known to raise public awareness. However, little is known whether differences in transmission technology are relevant for the...
Today's energy consumption and energy demand is increasing. That is particularly true in case of electric power consumption. The electric power is transferred from the power plants to cities and other consumers through the transmission network. The transmission lines should operate on the designed voltage and ampacity of the line, but due to the increased demands, some of the lines are already operating...
For the monitoring of high-voltage-overhead-lines, automated robotic systems increasingly come to use. Regardless of whether this is set to linecrawler-technology or aerial platforms, Global Navigation Satellite Systems (GNSS) are used for navigation and geo-referencing on nearly all of these robotic systems. In order to test the function and quality of GNSS-receivers and -antennas at these environmental...
Live working technology is to ensure the safe operation of UHV transmission lines is an important technical means, and the security and stability to equal-potential is a key link for live working. UHV line tension insulator string length, the distance between united and dip Angle, etc is bad for workers along the insulator into the equal-potential. For workers from jumping into the equal-potential...
In the GB/s regime, accurate modeling of conductor loss is a precursor to successful high-speed serial link design. By using available conductor roughness data published in manufacturers' data sheets, an equivalent multi-sphere model, based on the cubic closed-packing of equal spheres, is presented and applied to the Huray roughness model.
In recent years there has been increased interest in dynamic assessment of transfer capability of transmission lines in power systems based on real-time measurements of atmospheric data. The dynamic transfer capability enables the transmission system operators to utilize existing power lines more effectively and more safely with regards to critical power line temperatures and to enforce safety measures...
Aim of the present paper is assessing the technical-economic comparison between three-conductor bundled (3B) and four-conductor bundled (4B) 380 kV overhead transmission lines (OHLs). In both cases, the widely used standard ACSR 31.5 mm is taken as the base conductor. Increasing the number of conductors with respect to the commonly used 3B improves the transport capacity, which can be properly represented...
Due to the recent situation in the neighbouring countries, where icing damaged many transmission and distribution power lines and caused financial losses, it is necessary to operate weather stations. Last icing events caught the overhead power line operators unprepared because they occurred in locations where the design did not expect any icing. The contribution summarizes the knowledge on the effect...
In future, parallel AC and DC medium voltage overhead lines and underground cables could be in operation together. Coupling can lead to overvoltages and overcurrents, which may have a negative impact on various operating resources. In this paper, firstly the relevant coupling mechanisms for medium voltage level overhead lines and cables are identified. Then, the analysis of exemplary overhead line...
Applications of gas-insulated transmission line (GIL) has increased in applied length and required power. World-wide underground bulk power transmission is getting more and more imported due to restricted available space and higher concentration of electric load mainly in metropoles and large cities. The increase of required electric power at concentrated locations requires power transmission solutions...
The crosstalk is a very important aspect of cable EMC (electromagnetic compatibility) performance evaluation. As uncertainties are introduced during cable fabrication and installation process, deterministic prediction methods are not suitable for a good estimation of the cable performance. This paper is focused on predicting the crosstalk of cable bundles by considering the uncertainties introduced...
Contribution deals with automated measurements of mechanical parameters and current carrying capacity of selected Aluminum-conductor Steel-reinforced (ACSR) cables and a combined optical ground cable. After a detail description of realized tests indication of future use of obtained results follow.
A lightning stroke causes current injection into transmission lines at the point of contact. The lightning performance can be difficult to understand without using simulation programs. PSCAD is powerful software was selected to develop the appropriate data required to investigate this phenomena. In this paper, a model of 500 kV transmission line is developed when lightning stroke hits the shield wire...
A recently conducted analysis in the framework of Transmission-Line Super Theory (TLST) led to new formulations for the reflection and transmission coefficients of inhomogeneous transmission lines at high frequencies. In this paper, these results are used and applied for the first time on practical non-uniform conductor configurations. The results obtained agree excellently with the exact TLST solutions,...
In this paper, the transient analysis of lossy and dispersive multiconductor transmission lines is considered. The existing Green's function-based method is extended to explicitly include delays extraction, thus leading to a significant compressed time-domain state-space model. The proposed method is mainly based on poles and residues asymptotic analysis and lossless delays extraction. The resulting...
The transmission capacity of high voltage overhead power transmission lines (OHLs) can be increased in different ways. One of these is to increase the number of standard ACSR (Aluminium Conductor Steel Reinforced) conductors forming the bundles of OHLs. This paper analyzes the performance of 400 kV, four-conductor bundled (4B) OHLs in terms of loadability, i.e. the maximum power that can be transmitted...
Aiming to explore the applicability of Gas-Insulated Lines (GILs) over long distances, in this paper we perform a technical comparison between a GIL and a three-conductor bundled, traditional overhead line (OHL), for a 400 kV, 200 km long connection. The technical comparison is based upon transmission capacity and power losses. We derive the transmission capacity of the two systems from the relevant...
This paper presents a stochastic optimization approach to the feasibility study for power lines, taking into account market conditions. To validate the proposed stochastic approach, an economic comparison of several power line design alternatives has been done, considering technical issues as well. The final evaluation and analysis was based on the results obtained by applying both approaches: the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.