نتایج جستجو برای: lightning protection

تعداد نتایج: 185753  

2017
Mahdi Izadi Muhammad Syahmi Abd Rahman Mohd Zainal Abidin Ab-Kadir Chandima Gomes Jasronita Jasni Maryam Hajikhani

Protection of medium voltage (MV) overhead lines against the indirect effects of lightning is an important issue in Malaysia and other tropical countries. Protection of these lines against the indirect effects of lightning is a major concern and can be improved by several ways. The choice of insulator to be used for instance, between the glass, ceramic or polymer, can help to improve the line p...

 Insufficient electrical endurance of equipment and insulation failure against overvoltage is one of the most effective reasons for failure the power line. Lightening, switching or other disruptive parameters can cause line outage or distribution substation failure. There are different devices used to improve the safety, reliability, and power quality of the system. Surge arresters are one of t...

2012
Thongchai Disyadej Stanislaw Grzybowski

This research focuses on an investigation of the attractive width of high voltage transmission lines to lightning strokes. In order to design the optimal lightning protection, the estimated number of lightning flashes to the line, which is based on its attractive width, needs to be determined. The investigation was performed using experiments with tested models at the Mississippi State Universi...

Journal: :The Medical journal of Australia 2002
Michael Makdissi Peter Brukner

Lightning is an important cause of weather-related morbidity and mortality and is often underrated. There has been an increase in the proportion of casualties occurring during outdoor sport and recreational activities over recent years. However, in Australia, there is a deficiency in recommendations for lightning safety at sporting events. Organisers of sporting events should have a lightning s...

2007
Davide PAVANELLO

The study of the interaction of lightning electromagnetic fields with electrical systems and the design of appropriate protection strategies are generally based on statistical distributions of the lightning current measured at the channel base using either instrumented towers or artificial initiation of lightning using rockets. Recent studies based both on numerical modeling and experimental ob...

Journal: :Transactions of the American Institute of Electrical Engineers 1894

2004
F. D. Martzloff

Working paper developed for a NASA-sponsored study of solar cells Significance Part 6: Tutorials, textbooks and reviews Lightning interception by an unprotected building 30 feet high x 45 feet long on flat land, in the Cleveland area, can be estimated at one strike per 200 years on the average. However, peculiar configuration can easily affect this estimate upward or downward. Means are availab...

2008
Alexandre Piantini

Distribution lines are often located in areas with high ground flash densities, being therefore subject to lightning-caused power interruptions. This paper presents an overview of the various types of lightning overvoltages that can arise on overhead power distribution networks, as well as typical voltage waveforms. The effectivenesses of the most important methods for mitigating such overvolta...

2003
G. J. Hahn François Martzloff

New transient suppressors using meta l oxide varistors offer improved protection of appliances and consumer electronics against overvoltages. This improvement, however, could be at t h e risk of imposing excessive duty on t h e suppressor in case of a very severe lightning s t roke near the house where these suppressors a r e installed. A simulated house wiring system was subjected to three lev...

2016
J. A. Morales E. Orduña C. Rehtanz

One of most important elements of Electric Power Systems (EPS) is the transmission line (TL), which is permanently under adverse conditions especially lightning strokes. At the moment, those phenomena have been the root cause of short circuits and the most important cause of mal-operation of transmission line protection relays. Thus, this paper develops the classification of lightning transient...

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