Voltage withstand properties of the insulation of different types of medium voltage covered overhead line conductors

2018 ◽  
Author(s):  
Ivar Kiitam ◽  
Paul Taklaja ◽  
Kaur Tuttelberg
Keyword(s):  
Overhead Line ◽  
Medium Voltage ◽  
Different Types

scholarly journals On the Use of LoRa Technology for Logic Selectivity in MV Distribution Networks

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3079 ◽  
Author(s):  
Leopoldo Angrisani ◽  
Francesco Bonavolontà ◽  
Annalisa Liccardo ◽  
Rosario Schiano Lo Moriello
Keyword(s):  
Cost Effectiveness ◽  
Long Range ◽  
Distribution Networks ◽  
Fault Isolation ◽  
Optimized Design ◽  
Medium Voltage ◽  
Different Types ◽  
The Times ◽  
The Cost ◽  
Types Of Faults

In this paper, a logic selectivity system based on Long Range (LoRa) technology for the protection of medium-voltage (MV) networks is proposed. The development of relays that communicate with each other using LoRa allows for the combination of the cost-effectiveness and ease of installation of wireless networks with long-range coverage and reliability. The realized demonstrator to assess the proposed system is also presented in the paper; based on different types of faults and different locations, the times needed for clearing a fault and restoring the network were estimated from repeated experiments. The obtained results confirm that, with an optimized design of transmitted packets and of protocol characteristics, LoRa communication grants fault management that meets the criteria of logic selectivity, with fault isolation occurring within the maximum allowed time.

Short interruptions caused by lightning in overhead line medium voltage networks

2008 ◽  
Author(s):  
M. Parviainen ◽  
P. Heine ◽  
M. A. Omidiora ◽  
M. Lehtonen ◽  
J. Niskanen ◽  
...  
Keyword(s):  
Overhead Line ◽  
Medium Voltage

scholarly journals Cost of Industrial Process Shutdowns due to Voltage Sag and Short Interruption

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2874
Author(s):  
Édison Massao Motoki ◽  
José Maria de Carvalho Filho ◽  
Paulo Márcio da Silveira ◽  
Natanael Barbosa Pereira ◽  
Paulo Vitor Grillo de Souza
Keyword(s):  
Field Survey ◽  
Industrial Process ◽  
Sao Paulo ◽  
Electricity Sector ◽  
Voltage Sag ◽  
International Literature ◽  
Medium Voltage ◽  
Specific Questionnaire ◽  
Different Types ◽  
The Cost

The objective of this work is to propose and apply a methodology to obtain the cost of industrial process shutdowns due to voltage sag and short interruption. A field survey, aided by a specific questionnaire, was carried out in several industries connected to medium voltage networks, in the states of Espírito Santo and São Paulo in Brazil. The results obtained were the costs per event and the costs per demand in a total of 33 companies in 12 different types of activities. It is noteworthy that this survey brings a relevant technical contribution to the electricity sector, helping to fill, even partially, an existing gap in both national and international literature.

Simulation of the Lightning Back-Flashover for Medium Voltage Distribution Network

2016 ◽  
Vol 3 (2) ◽  
pp. 264
Author(s):  
Osama El-Sayed Gouda ◽  
Noura Ahmed Elshesheny
Keyword(s):  
Distribution Network ◽  
Overhead Line ◽  
Voltage Distribution ◽  
Lightning Strikes ◽  
Factors Affecting ◽  
Analysis Study ◽  
Medium Voltage ◽  
Distribution Lines ◽  
Soil Ionization

Lightning strikes represent a considerable cause of short interruptions in electrical overhead line networks. The over voltages caused by lightning cannot be avoided but their influence can be limited by appropriate over voltage protection. This paper presents analysis study on some factors affecting the back flashover of Egyptian 66 kV distribution lines using Alternative Transient Program (ATP). The study includes the modeling of 66 kV distribution lines, the effects of magnitude and the front and tail times of lightning wave on the back flashover voltages, the effects of the striking distance, and the using of counterpoise wires on the back flashover on the 66 kV line towers. In this paper the 66 kV lines sag is neglected and the soil ionization by the flow of the stroke current is considered.

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