scholarly journals Outage severity analysis and RAM evaluation of italian overhead transmission lines from a regional perspective

ACTA IMEKO ◽  
2016 ◽  
Vol 5 (4) ◽  
pp. 73
Author(s):  
Mohamed Khalil ◽  
Christian Laurano ◽  
Giacomo Leone ◽  
Michele Zanoni
Keyword(s):  
Transmission Lines ◽  
Power Plants ◽  
Power Transmission ◽  
Electrical Energy ◽  
Point Of View ◽  
Power Transmission Lines ◽  
Severity Factor ◽  
Overhead Transmission Lines ◽  
Maintenance Activities ◽  
Generation Power

<p>Power transmission lines represent the core of the High Voltage Network since they are responsible for the transport of the electrical energy from the generation power plants to the electrical substations. In this paper, an analysis of the outages occurred to the Italian Overhead Transmission Lines (OHTLs) from 2008 to 2015 is carried out. A new simple and effective reliability index, namely the Severity Factor, is introduced with the aim to drive the prioritization of the failure causes and the enhancement of the maintenance activities. The analysis has been performed focusing on the geographical distribution of the OHTLs. For each analyzed region, the voltage levels more prone to failure have been determined. The proposed methodology, thanks to the introduction of the Severity Factor, is a useful and effective tool for the identification of the transmission network criticalities and the enhancement of the related maintenance activities. Finally, an evaluation of the reliability, availability, safety and maintainability (RAMS) of the Italian OHTL network has been performed from a regional point of view.</p>

scholarly journals Fault Detection in Power Equipment via an Unmanned Aerial System Using Multi Modal Data

Sensors ◽  
2019 ◽  
Vol 19 (13) ◽  
pp. 3014 ◽  
Author(s):  
Bushra Jalil ◽  
Giuseppe Riccardo Leone ◽  
Massimo Martinelli ◽  
Davide Moroni ◽  
Maria Antonietta Pascali ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Power Plants ◽  
Large Scale ◽  
Infrared Imaging ◽  
Power Transmission ◽  
Video Stream ◽  
Power Lines ◽  
Power Transmission Lines ◽  
Ground Station ◽  
Illumination Changes

The power transmission lines are the link between power plants and the points of consumption, through substations. Most importantly, the assessment of damaged aerial power lines and rusted conductors is of extreme importance for public safety; hence, power lines and associated components must be periodically inspected to ensure a continuous supply and to identify any fault and defect. To achieve these objectives, recently, Unmanned Aerial Vehicles (UAVs) have been widely used; in fact, they provide a safe way to bring sensors close to the power transmission lines and their associated components without halting the equipment during the inspection, and reducing operational cost and risk. In this work, a drone, equipped with multi-modal sensors, captures images in the visible and infrared domain and transmits them to the ground station. We used state-of-the-art computer vision methods to highlight expected faults (i.e., hot spots) or damaged components of the electrical infrastructure (i.e., damaged insulators). Infrared imaging, which is invariant to large scale and illumination changes in the real operating environment, supported the identification of faults in power transmission lines; while a neural network is adapted and trained to detect and classify insulators from an optical video stream. We demonstrate our approach on data captured by a drone in Parma, Italy.

scholarly journals Applying the permissive overreaching transfer Trip of SEL 311L distance relay to protect the transmission line

2020 ◽  
pp. 19-23
Author(s):  
Pham Van Kien Pham
Keyword(s):  
Transmission Lines ◽  
Power Plants ◽  
Power Transmission ◽  
Electronic Device ◽  
Power Transmission Lines ◽  
Wind Power Plants ◽  
Fast Processing ◽  
Clearing Time ◽  
Intelligent Electronic Device ◽  
The Stability

Vietnam\'s electricity system has been increasingly invested in development, meeting the growth rate of energy consumption demand in all socio-economic aspects. In particular, the energization and commission of solar and wind power plants greatly affect the stability and safety of the Vietnam power system. To improve the system\'s stability when incidents occur, one of the current solutions is to coordinate relay calibration settings which have a rapid reaction time at all voltage levels. To meet the above requirements, an option is to use Intelligent Electronic Device (IED) with fast processing speed, reduced latency, and multiple functions with intelligent algorithms. In addition, the solution to coordinate the protection areas between IEDs is being concerned. This paper presents the coordination of Permissive Over-Reaching Transfer Trip (POTT) interlock function of SEL 311L relay for power transmission lines to reduce the fault clearing time compared to the traditional calculation method.

scholarly journals Accident rate at energy objects in Sakha Republic at low temperatures

2019 ◽  
Vol 77 ◽  
pp. 03007
Author(s):  
Dmitry Prokhorov ◽  
Nikita Pavlov
Keyword(s):  
Transmission Lines ◽  
Low Temperatures ◽  
Power Plants ◽  
Power Transmission ◽  
Climatic Factors ◽  
Power Transmission Lines ◽  
Accident Rate ◽  
Sakha Republic ◽  
Emergency Situations ◽  
The Republic

The work analyzes the effect of low temperatures and other climatic factors on the accident rate and reliability of energy facilities. To represent the causes and analyze the consequences in emergency situations at power plants, descriptions of accidents that occurred in the Sakha Republic were collected and considered. For the analysis, examples are chosen that contain more complete descriptions of the various interrelated causes and consequences of accidents. It was revealed that the greatest number of accidents occurs in the period of low temperatures. High accidents in the summer months are also associated with the climatic features of the republic, mainly with accidents in the power supply system: seasonal melting of permafrost, floods, wildfires and in connection with this drop in power transmission lines, overruns and wire breaks due to storm wind and other.

scholarly journals Structural Analysis of Steel Transmission Towers for Large River Crossing of Overhead Transmission Lines

2020 ◽  
Vol 10 (6) ◽  
pp. 6438-6444
Author(s):  
M. S. Rechtman ◽  
J. N. M. Motta ◽  
A. Menezes ◽  
J. G. S. Da Silva ◽  
O. Longo
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Large River ◽  
Northern Region ◽  
Power Transmission Lines ◽  
New Materials ◽  
Design Standards ◽  
Overhead Transmission Lines ◽  
Transmission Towers ◽  
Structural Solutions

This study aims to investigate the structural behavior of steel transmission towers used for large river crossings. Design standards usually applied to analyze these structures don’t consider situations in which the transmission towers are used in river crossings. In Brazil, due to the fact that it is necessary to cross large areas owing to the rivers’ size, these towers assume great heights. It should be noted that the towers can weigh up to 24,500kN and exceed 300m in height. The current study develops an analysis that surpasses the existing standard methodologies, aiming for a structural optimization compatible with vast crossings and new materials, aiming to resolve this design challenge regarding power transmission lines. To do this, a river crossing spanning 2,300m, situated in the northern region of Brazil, was studied based on the use of three different conductor configurations, electrically equivalent, commonly used wind design standards, and structural solutions utilizing tubular and angle profiles.

scholarly journals Multiset-based assessment of vulnerability of energy infrastructures to destructive impacts

2021 ◽  
Author(s):  
I. Sheremet
Keyword(s):  
Transmission Lines ◽  
Power Plants ◽  
Power Transmission ◽  
Graph Representation ◽  
Future Research ◽  
Power Transmission Lines ◽  
Basic Graph ◽  
Energy Infrastructures

This paper is dedicated to the application of the multigrammatical framework to the assessment of vulnerability of energy infrastructures affected by impacts destroying (reducing capabilities of) their facilities (power plants, fuel producing plants, power transmission lines, fuel transporting pipes, as well as networking devices of both electricity and fuel subsystems of an energy infrastructures). A basic graph representation of energy infrastructures is considered, and technique of their multigrammatical representation is introduced. Criterial base for recognition of the energy infrastructures vulnerability, being a generalization of the similar criterial base developed regarding industrial infrastructures is proposed. Techniques of multigrammatical modelling reservation of energy infrastructures and their recovery after impacts is proposed. Directions of future research in this area are announced.

scholarly journals Susut Tegangan pada Penghantar ACCC di Saluran Transmisi 150 kV di PT. PLN (Persero) Unit Pelayanan Transmisi Pekanbaru

SainETIn ◽  
2020 ◽  
Vol 5 (1) ◽  
pp. 1-7
Author(s):  
Wellington Octary ◽  
Hamzah Eteruddin ◽  
Abrar Tanjung
Keyword(s):  
Transmission Lines ◽  
Power Distribution ◽  
Power Loss ◽  
Power Plants ◽  
Power Transmission ◽  
Voltage Drop ◽  
Transmission Network ◽  
Power Transmission Lines ◽  
Power Losses ◽  
Line Diagram

Power transmission network system plays an important role in distributing power, especially in 150 kV power transmission lines. In 2013, the was a change in term of conductor type in in 150 kV transmission lines of Garuda Sakti – Balai Pungut, from ACSR to ACCC, because of the growing number of power plants in Riau and power distribution in every conductor supplying higher current, when given higher current, ACCC conductor is capable of transmitting power twice the ACSR conductor. The single line diagram of UPT Pekanbaru, data from power station (GI) Garuda Sakti – Balai Pungut, conductor data and load data are all data necessary for the study and calculation on ACCC conductor. The result shows that the amount of voltage drop power losses of ACCC conductor is 5.098 kV, while the power loss is 479,187 with the sagging value is 6.950 m, compared to the old conductor, the ACSR type, with the voltage drop of 7.517 kV, power loss of 828.863 kW, and the sagging value of 9.010 m, all measured in 150 kV power transmission lines of PT. PLN PERSERO UPT Pekanbaru.

scholarly journals The determination of short circuits and grounding faults in electric power systems using time-frequency analysis

2017 ◽  
Vol 26 (2) ◽  
pp. 123
Author(s):  
Vedat Esen ◽  
Bulent Oral Oral ◽  
Tahir Cetin Akinci
Keyword(s):  
Mathematical Method ◽  
Power Systems ◽  
Fourier Analysis ◽  
Transmission Lines ◽  
Power Transmission ◽  
Short Circuit ◽  
Electrical Energy ◽  
Power Transmission Lines ◽  
Time Frequency ◽  
Time Band

In order to ensure that electrical energy reaches consumers uninterrupted, researchers constantly try to improve power transmission lines. To realize this improvement, probable faults should be analysed through every known method, and new methods should also be implemented. In this study, firstly, the Keban power transmission line located in the Eastern Anatolia region of Turkey was modelled. After that, probable short circuit scenarios were applied on the model, and the short circuit faults in the scenarios were analysed by using the Fourier analysis. The Fourier analysis is a mathematical method that is used as an effective way to determine the sudden changes in the frequency and time band. The study was successful in determining phase and grounding faults through the analyses of the scenarios using Fourier analysis. The fact that the mathematical method was applied on the probable scenarios on a physical model increases the importance of the study.

scholarly journals High-voltage smart electricity metering of 110 kV digital electric networks

2021 ◽  
Vol 279 ◽  
pp. 01029
Author(s):  
Alexander Yurov ◽  
Alexander Voronov ◽  
Alexey Lukonin ◽  
Vasiliy Yurov
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Electrical Energy ◽  
Power Transmission Lines ◽  
Electric Networks ◽  
Smart Systems ◽  
Electrical Grids ◽  
Automatic Information ◽  
The Cost ◽  
Technical Solutions

Were considered the technical solutions sufficient for the development of smart systems for automatic information and measurement metering of electrical energy and monitoring of overhead power transmission lines of the 110-220 kV electrical grids, considering the integration of the data flow into Scada-systems of digital substation workplaces in all the accordance with the standard protocols of IEC 61850. The device allows you to control the quality of transmitted electricity, remotely monitor the condition of the line, thereby increasing the reliability of power supply and power flows in the power system, reducing the cost of operational teams for their inspection.

On the system of ensuring electrical safety of maintenance works performed on 35 – 750 kV power transmission lines being under induced voltage implemented in the Republic of Belarus

2018 ◽  
Vol 11 (2) ◽  
pp. 154-160
Author(s):  
M. A. Drako ◽  
A. M. Korotkevich ◽  
V. N. Porshnev
Keyword(s):  
Transmission Lines ◽  
Power Plants ◽  
Power Transmission ◽  
Operation Mode ◽  
Normal Operation ◽  
Electrical Safety ◽  
Power Transmission Lines ◽  
Induced Voltage ◽  
The Republic ◽  
Overhead Power Lines

The article studies the matters of physics of interaction of parallel overhead power transmission lines. Cases are presented, where the maximum induced voltage values are expected on individual sections of closely approaching de-energized and energized power transmission lines. Possible scenarios are presented of direct contact with an unearthed conductor (wire) of OPL in the normal operation mode. Substantiation is presented of review of the list of the lines, which, when de-energized or earthed at terminal sections (in the switchgear of substations and power plants) have the values of induced voltage on the earthed conductors, as reduced to the maximum permissible continuous current of the affecting OPL, exceeding 25 V . Criteria are identified to classify OPL as being affected by induced voltage. The article considers organizational and technical procedures applied to provide safe maintenance works under induced voltage on de-energized overhead power lines (OPL) located within an area affected by energized OPL.  Attention is given to the detailed description of types of earthing of OPL, line equipment, working section and workplaces used by State Production Association Belenergo. The mathematical apparatus used in the analytical calculations of the induced voltage values has been analyzed. The technical implementation of acceptable schemes of performing the repair and maintenance works on the earthing of de-energized OPL is considered. Performing geophysical ground survey by the method of vertical electrical sounding at places of mounting special low-resistance earthing electrodes is proposed and implemented. The methodology is developed and tested for measuring induced voltage values, which sets the order of induced voltage measurements on de-energized OPL running close to energized OPL with the voltage 110 kV, and higher. Comparative analysis is presented of results of analytical calculations and experimental research. Conclusions are made supporting the approach adopted and confirming the expediency of the system of ensuring electrical safety of maintenance works performed on 35–750 kV power transmission lines being under induced voltage implemented in the Republic of Belarus.

Residual Voltage as Possible Cause of Equipment Damage and Risk for Personnel under Overhead Power Transmission Lines Outage. Part 2

2017 ◽  
Vol 6 (3) ◽  
pp. 24-33
Author(s):  
Н. Рубцова ◽  
N. Rubcova ◽  
А. Токарский ◽  
A. Tokarskiy ◽  
В. Рябченко ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Power Transmission Line ◽  
Power Transmission Lines ◽  
Residual Voltage ◽  
Idle Mode ◽  
Overhead Transmission Lines ◽  
Overhead Power Transmission Lines ◽  
Overhead Power Transmission Line ◽  
Possible Cause

This is continuation of the paper “Residual Voltage as Possible Cause of Equipment Damage and Risk for Personnel under Overhead Transmission Lines Outage. Part 1” where on the example of 500 kV overhead power transmission line (OHL) have been considered residual voltages arising between switch’s open contacts for each phase under outage of 500 kV OHL operating in idle mode. In the present paper have been carried out studies of residual voltages arising between phases switches under outage of 500 kV OHL. Maximal values of these resulting voltages exceed a double amplitude value of the OHL nominal phase value, and that may be the reason for a breakdown of the air gap between the switches, damage of the switches, and the risk for the personnel during a substation walk around.

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