The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The consequences due to lightning on different building shapes needs a comprehensive knowledge in order to provide the information to the common man. This paper is mainly concern with the development of a small scale model to study impulse flashover and attachment pattern of protected building structures due to lightning strike. The lightning strike pattern of buildings is based on the practical experimental...
Lightning Air Terminal (LAT) is normally a sharp-tipped rod that is used to intercept direct lightning strike to ground structures. However it was found that LAT sometimes does not function as it should be due to aging and prolonged exposure to the acidic rain. This paper presents on the studies to determine chemical compounds; Polyvinyl Acetate and Polyvinyl Alcohol that can be use to enhance LATs'...
Analysis of shielding failure is carried out to observe flashover of insulators parallel with phase conductors of a transmission line associated with a lightning strike on phase conductor. Peak current of different magnitude have been used to represent the multiple strokes lightning (MSL). This paper aims to simulate the worst case due to transmission shielding failure with three direct strikes to...
Lightning induces voltage on a horizontally suspended conductor due to electromagnetic field coupling. If the induced voltage is measured across a matched impedance at both ends, it may be possible to locate the distance and angle of incidence of the lightning. Researches on lightning induced voltages mainly focus on its effect to insulation across the conductor and ground. The situation is modeled...
Narrow bipolar pulses (NBPs) are considered as isolated intracloud events with higher peak amplitude and strong high frequency emission compared to the first return strokes and other intracloud discharges. From 182 NBPs recorded in Malaysia in the tropic, 75 were narrow negative bipolar pulses (NNBPs) while 107 were narrow positive bipolar pulses (NPBPs). The mean duration of NNBPs was 24.6±17.1μs,...
Analysis of induced voltages on transmission tower and conductors has been performed when a high voltage line is subjected to propagation of lightning transient. PSCAD/EMTDC software program is used to carry out the modelling and simulation works. Lightning strikes on the tower top or conductors result in large overvoltages appearing between the tower and the conductors. Two cases considered for these...
In this paper, the effect of lightning on a gas pipelines is investigated. The metallic pipelines were modelled as a short transmission line of PI-circuit model. A switch is represented as a pair of sphere-gaps and is used to model side-flash and insulation breakdown of air. The lightning strike leader is represented by a simple high current source generation with DC source and other elements. Results...
This paper describes on study about standard and non-standard lightning current dispersion system in telecommunication building by using ATP-EMTP simulation and structure model. The metallic grid like structure was modeled as multiphase Pi-circuit network, which consists of many mutually coupled branches and used to simulate the actual telecommunication building. ATP-EMTP simulation was used to validate...
Harsh environmental conditions can damaged a lightning air terminal (LAT). If the tip of LAT is altered than the corona emission pattern will also be altered. The corona emission current is one of parameters to assess a LAT performance. Corona emission can only be formed when a particular humidity degree is achieved. Concerning this matter a new testing setup has been developed in the Institute of...
A lightning air terminal (LAT) tip can be damaged under prolonged period of service due to harsh environmental conditions among those is the impact of acid rain. The altered LAT tip profile will ultimately produce different corona discharge pattern which can influence the performance of the LAT itself. This paper presents a new closed loop mathematical modelling which can simulate the magnitude of...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.