scholarly journals The Corona Phenomenon in Overhead Lines: Critical Overview of Most Common and Reliable Available Models

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6612
Author(s):  
Erika Stracqualursi ◽  
Rodolfo Araneo ◽  
Salvatore Celozzi
Keyword(s):  
Corona Discharge ◽  
Transmission Lines ◽  
Electrical Engineering ◽  
Propagation Delay ◽  
Dissipative Process ◽  
Overhead Lines ◽  
Comprehensive Information ◽  
Sensitivity Curves ◽  
Critical Overview ◽  
Additional Losses

Research on corona discharge, shared by physics, chemistry and electrical engineering, has not arrested yet. As a dissipative process, the development of corona increases the resistive losses of transmission lines and enhances the line capacitance locally. Introducing additional losses and propagation delay, along the line, non-linearity and non-uniformity of the line parameters; therefore, corona should not be neglected. The present work is meant to provide the reader with comprehensive information on the corona macroscopic phenomenology and development, referring to the most relevant contributions in the literature on this subject. The models proposed in the literature for the simulation of the corona development are reviewed in detail, and sensitivity curves are provided to highlight their dependence on the input parameters.

scholarly journals Design and Optimization of Detection Antenna for Corona Discharge in High-voltage Transmission Lines

2020 ◽  
Vol 1486 ◽  
pp. 062024
Author(s):  
Xiaoming Xiao ◽  
Weinan Hu ◽  
Jun Ran ◽  
Zheng Xu ◽  
Guoyu Hei ◽  
...  
Keyword(s):  
Corona Discharge ◽  
High Voltage ◽  
Transmission Lines ◽  
Design And Optimization ◽  
High Voltage Transmission

Design of the Miniaturized Receiving Antenna Applied in the Detection of Corona Discharge Signals

2011 ◽  
Vol 105-107 ◽  
pp. 2188-2193
Author(s):  
Xiao Han ◽  
Xi Chen ◽  
Peng Fei Li
Keyword(s):  
Corona Discharge ◽  
Transmission Lines ◽  
Small Volume ◽  
Industrial Applications ◽  
Patch Antennas ◽  
Negative Corona Discharge ◽  
Receiving Antenna ◽  
Security Inspection ◽  
The Time Domain ◽  
To Receive

Corona discharge is a kind of self maintained discharges that occurs in the extremely uneven electric field which often happens in the industrial and daily living environments. In this paper, we study the characteristics of corona discharge, especially the ones in the time domain and frequency domain of negative corona discharge. Based on the analyzed characteristics mentioned above, we design and optimize a kind of patch antennas, which has the advantages of small volume compared to the traditional one used to receive the signals generated by corona discharge. This new antenna can be used in the field of security inspection on high voltage transmission lines applied in the industrial applications.

scholarly journals The Way of Reducing Current Values in Optical Ground Wires at Asymmetrical Faults on Overhead Transmission Lines

2016 ◽  
Vol 11 (1) ◽  
pp. 13-20
Author(s):  
Georgiy Egamnazarov
Keyword(s):  
Cross Section ◽  
Transmission Lines ◽  
Conclusive Evidence ◽  
Fault Current ◽  
Overhead Lines ◽  
Optical Cable ◽  
Electric Power Grid ◽  
Three Phase ◽  
Wire Steel ◽  
Wire System

Abstract Given the fact that the installing costs of an optical ground wire on overhead lines directly depend on its cross-section, which in turn depends on the level of fault current it should withstand, in order to reduce these current values in the optical ground wire, I suggested performing its isolated descents from the end towers of the line with its transition to an optical cable. The research was carried out on the example of a 500 kV overhead line in the National Electric Power Grid. The Method of Symmetrical Components for calculating asymmetrical fault currents was not used; therefore, calculations were carried out on the base of presenting the line as a multi-wire system for the considered case as a five-wire system (optical ground wire, steel ground wire, and three phase wires). Such approach allows taking into account the initial asymmetry of the line parameters and modeling any kind of asymmetrical faults. The analyses of calculated results were performed. The conclusive evidence that the optical ground wire isolated descents from the end towers of the line give the possibility of reducing the level of maximal fault current distribution values in it and therefore its cross section, is presented.

scholarly journals The Ultraviolet Detection of Corona Discharge in Power Transmission Lines

2013 ◽  
Vol 05 (04) ◽  
pp. 1298-1302 ◽  
Author(s):  
Lan Chen ◽  
Lin Lin ◽  
Mimi Tian ◽  
Xingming Bian ◽  
Liming Wang ◽  
...  
Keyword(s):  
Corona Discharge ◽  
Transmission Lines ◽  
Power Transmission ◽  
Power Transmission Lines ◽  
Ultraviolet Detection

scholarly journals A Novel Overcurrent Suppression Strategy during Reclosing Process of MMC-HVDC

2019 ◽  
Vol 9 (9) ◽  
pp. 1737 ◽  
Author(s):  
Bin Jiang ◽  
Yanfeng Gong
Keyword(s):  
Transmission Lines ◽  
Short Circuit ◽  
Current Method ◽  
Short Circuit Current ◽  
Simulation Software ◽  
Fault Current ◽  
Overhead Lines ◽  
Hvdc System ◽  
Electromagnetic Transient Simulation ◽  
Current Calculation

A modular multilevel converter based high-voltage DC (MMC-HVDC) system has been the most promising topology for HVDC. A reclosing scheme is usually configured because temporary faults often occur on transmission lines especially when overhead lines are used, which often brings about an overcurrent problem. In this paper, a new fault current limiter (FCL) based on reclosing current limiting resistance (RCLR) is proposed to solve the overcurrent problem during the reclosing process. Firstly, a mesh current method (MCM) based short-circuit current calculation method is newly proposed to solve the fault current calculation of a loop MMC-HVDC grid. Then the method to calculate the RCLR is proposed based on the arm current to limit the arm currents to a specified value during the reclosing process. Finally, a three-terminal loop MMC-HVDC test grid is constructed in the widely used electromagnetic transient simulation software PSCAD/EMTDC and the simulations prove the effectiveness of the proposed strategy.

Patterned Macrovoids for Dielectric Constant Control of High Frequency Circuit Substrates

1986 ◽  
Vol 72 ◽  
Author(s):  
M. Kahn ◽  
B. Kriese
Keyword(s):  
Dielectric Constant ◽  
Transmission Lines ◽  
High Frequency ◽  
Thermal Conductance ◽  
Propagation Delay ◽  
Constant Control ◽  
Microstrip Transmission Lines

AbstractFugitive ink and tape technology permit the inclusion of flat voids at predetermined locations in ceramic microcircuit substrates. Calculations show that critical stray capacitances can be reduced by as much as 65% and the propagation delay of microstrip transmission lines by 30% and more. The selectivity of the void location permits the retention of the full thermal conductance of the substrate under heat dissipating elements.

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