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The paper presents an example of modeling high-voltage line with classical columns and pillars compacted with the same lines and testing out the model in the programming tool DIgSILENT with actual measured data for Single Line to Ground Fault with the use of ARs. The parameters of the classical and compacted 400 kV transmission line are entered into the model in the example of 400 kV line Tuzla 4...
The continuously growing electrical power demand is more and more faced by the increase of generation from renewable energy sources. Given the uneven distribution of those resources in the power system, an increase in the transmission lines current rating (also called ampacity) is expected in the next future, to avoid the formation of bottlenecks. Given the difficulties in building new lines, due...
Installation of Passive Cancellation Loops (PCLs) is an efficient technique to mitigate the magnetic field generated by high voltage overhead lines (OHLs). PCLs were firstly introduced in the late '90s; even if, at present time, they are seldom installed, they are expected to become a widespread solution due to the increasing public attention to EMF exposure. More in detail, they can be a readily...
This paper is concerned with the calculations of the phase current asymmetry on the power vhv overhead transmission line with two circuits. Presented algorithm allows taking into consideration the mutual inductive and capacitive couplings between the conductors. Their effect can be reduced with the help of the transmission line transposition. On the non-transposed transmission line these couplings...
This paper presents an approach to include changes of wind speed along a transmission line into the line model itself; it then uses the wind speed-dependent model to determine line power handling capabilities when the line is subjected to different wind speeds and wind speed profiles along the length of the line. Case studies are presented to show the effects of wind speed, and therefore of conductor...
Synchrophasors are increasingly being implemented to improve the understanding of network performance. This paper presents the use of voltage and current synchrophasors in the on-line performance monitoring of a transmission line. Line parameters, conductor temperature and sag are continuously derived. Power transfer capability and voltage stability requires minimal additional computational effort...
The paper deals with the calculation of Joule's losses on overhead transmission lines. The presented method allows taking into consideration the influence of a current asymmetry caused by various conductors layout and their inductive and capacitive couplings. The losses evaluation has been carried out with respect to the total transmitted energy, data given by year and day load diagrams were used...
The main objective of this work is to quantitatively study the extraction problem of distributed parameters of unparallel transmission lines, especially for one specific type of unparallel transmission line model. The infinitesimal transmission lines are equivalent to the parallel transmission lines, and the estimation method of distributed parameters is presented based on the original physical definition...
This paper describes an accurate digital distance relaying scheme integrated with artificial neural network block is developed using zero sequence component of a fault current and conventional ground impedance values, assuming that the conventional ground impedance always have some error impedance associated in it. The modified scheme is immune to the variation in fault location for under reach and...
Contemporary transmission networks are not fully utilized due to increased uncertainty and security buffers resulting mainly from the inefficient operation and planning, currently based on conservative predetermined thermal ratings. However, in a smart operation scheme, which considers time varying thermal ratings of transmission assets, operation and planning could be optimized to facilitate the...
Millions of kilowatt-hours of energy is continuously transferred from generation end to load end through transmission lines. Lower transmission loss in a power system increases the transmission efficiency and reduces the unit cost of electricity. This loss is generally reduced either by increasing the transmission voltage and or decreasing the resistance of the transmission conductor. The decrease...
In this paper, an analysis study on parameters which affecting the backflash over pattern cause by lightning is done. A 132kV double circuit transmission line is modeled using ElectroMagnetic Transient Program EMTP software for backflash over simulation. A vertically configured double circuit transmission line can be modeled into several parts: towers, insulators, phase conductors, ground wire and...
This paper puts forward a framework for estimating transmission line parameters (including series resistance, reactance and shunt susceptance), line temperature and sag utilizing synchronous voltage and current phasors measured by the phasor measurement unit (PMU) in real time. Transmission line parameters are essential inputs to various power system analyses and applications such as power flow analyses...
Lightning stroke is the key problem for safe operation of UHV transmission line. Because of the large scale of the tower and the high operation AC voltage, the shielding design of tower became one of the most important aspects of the UHV transmission line design. This paper was based on the typical towers of China 1000 kV AC transmission line: waist-type single-circuit tower, cup-shape single-circuit...
This paper represents a developed procedure for the evaluation of flashover rates caused by both lightning vertical and non-vertical strokes on transmission lines using a Monte Carlo method. The main goal of this paper is increase the accuracy of the flashover rates through an accurate modelling of network components such as footing impedance, transmission tower and the chain of insulators and also...
The paper is devoted to the identification of transmission lines from synchronized measurements of current and voltage phasors provided by the phasor measurement units (PMUs). The series and shunt line parameters are recursively estimated using the extended Kalman filter (EKF). Actual line temperature and reference resistance are estimated instead of actual series resistance, which is then computed...
In this article, the feasibility to obtain power from the shield wires of a transmission line, as a result of the electromagnetic induction effect, will be presented. The phase conductors of the considered transmission line are horizontally arranged each having a quadruple bundle configuration. The transmission line used during the study operates at 525 kV. The results obtained showed that this form...
A novel equivalent model to analyze the influence between the parallel UHVDC and EHVAC transmission lines is presented in the paper. In the model, the distributed capacitance between the transmission lines and the grounding lines is calculated firstly, then the equivalent circuit can be obtained. The induced voltage on the DC transmission lines caused by the AC transmission lines is calculated. The...
The recent increase in demand for power and the proliferation of remotely located renewable energy sources, have put pressure on electric power utilities to upgrade and expand their existing transmission infrastructure. Unfortunately, the construction of new power transmission lines is a costly and time consuming endeavour. In order to maximize the return on investment in the construction of new power...
It is desirable to use the same power line for sending communication signals as well as transmitting power. These communication signals can be used to control smart metering, provide network control and even provide Broadband communications over power lines (BPL). There is concern about the amount of radiation produced by power line communications (PLC). The authors have developed a Matlab?? program...
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