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This work deals with the design of a Lightning Protection System to the rocket launcher located in the Barreira do Inferno Launch Center. For its development the technical standards ABNT NBR 5419/2015 and IEC 62305 were used as main references. The Electrogeometrical Method (Rolling Spheres) was used for the development of the project, chosen after a thorough analysis of the other methods and the...
This paper shows that the criteria for the installation of surge protective devices (SPD) in power distribution panels as prescribed in standards on lightning protection and on low-voltage electrical installations may not prevent damages of sensitive electronic equipment, regardless of the protection level of the SPD and ground impedance. This is due to a not so evident source of damages related to...
The authors produced induced voltages on a real-size distribution line, the height of which is 10meters. A balloon filled with helium gas lifted a 150 meter-long copper conductor near the overhead distribution line. A pulse current was applied to the above conductor. Induced voltages on the overhead distribution line were observed at three points. As the distance between the grounding point of a copper...
As the largest archipelago in the world situated along equatorial line, Indonesia exposes to high potential lightning strikes, which are hazardous for operation of geothermal power plants. The severe effect of lightning strikes results in system malfunction leading to interrupted plant operation. This paper presents a novel grounding technique based on skin-effect theory and its implementation for...
The lightning performance of overhead transmission lines is affected by many factors. Most of those factors are nature driven and are not predictable or controllable. Of those controllable factors affecting a line's lightning performance, the one that can be dealt with most cost-effectively is the transmission line's shielding. However, at some utilities, the design and selection of the line shielding...
Situated along equatorial-line region Indonesia is exposed to lightning with relative high isokeraunic level. Hence, high reliable lightning system becomes compulsory for high-rise buildings, which are subject to lightning strike with relative high probability. However, in fact, this is not the case when we realize the quality of lightning protection system installed within most of high-rise building...
From EMC point of view lightning can be considered as the most destructive interference source for any sensitive electronic equipment. Its high impulse current conducted upon antenna's cable armor could generate magnetic field, which induces dangerous overvoltage or current within equipment circuits. Such magnetic induction gives some adverse effects to the equipment, such as improper function or...
The aim of the paper is to analyze overvoltages in overhead distribution lines induced by nearby lightning return stroke currents taking into account also the conductive coupling between the lightning current injected into the soil and the line's grounding system. Experimental results obtained in 2003 at the International Center for Lightning Research and Testing (ICLRT) in Florida have shown that...
This article presents a critical analysis of the 3 different methodologies to determine the suitable location of lightning arresters that are simultaneously accepted by some Brazilian and international standards.
The line lightning performance of the 33 kV distribution line Tanjung Batu - Rompin gives very bad performance during lightning. The lines have bad performance although they were equipped with the line lightning arrester to limit the overvoltages on the phase conductors when lightning strikes the line. There are several cases where the surge arresters were broken and exploded. In this study, the effect...
Insulated conductor has many advantages and the insulated rate of 10 KV overhead distribution lines at present is considerably high; however, insulated conductor will surely break when stricken by lightning. The defect that relay protection may not act after the conductor is broken will bring an even greater hidden danger to the circuit. This paper describes the operation situation of lightning protected...
One of the major tasks of a grounding system is to ensure safety for sensitive electrical and electronic equipments. The purpose of this paper is to provide knowledge of the physics of the lightning and of its effects on a GSM communication tower (low voltage circuit). Lightning interaction with man-made communication networks is part of the general area of electromagnetic compatibility (EMC). Based...
Generally, the flow of a lightning impulse current from a grounding electrode into ground is a very complicated process determined by many factors. In order to analyze the mechanism of the impulse current dissipating in the earth from grounding electrode, the experiments that had carried out by other authors almost used a single horizontal grounding wire or vertical grounding rod for sake of simplicity...
When impulse currents are injected into grounding electrodes and dissipate in the earth, the axial current distribution of the grounding electrodes will change with different electrode structures. In order to analyze the distribution law, using Rogowski coil as a current sensor, impulse simulation experiment is designed and performed on the grounding electrodes with various structures. Basing on the...
This paper describes lightning surge propagation characteristics on a nonuniform line are dependent on location. The propagation characteristics of the nonuniform line are different from those of the uniform one due to multiple reflections on the nonuniform line. It is impossible to derive an analytical formula to represent the surge characteristics of the nonuniform line in time domain without assumption...
Modeling NEV issues requires the most detailed circuit models for distribution system analysis except for, perhaps, lightning surge protection analysis. A proposed line model benchmark is solved and results reported. Modeling NEV will become an increasingly important problem. Based on the proliferation of harmonic producing loads in residential environments, the amount of triplen harmonics will tend...
Antennae, if present on roofs, are, usually, the most prominent part of edifices. Grounding their metal supports is, generally, considered an effective means of protection of the structure against the effects of lightning strokes, eventually "attracted" by the antennae themselves. The antenna's mast and the down conductor are incorrectly assumed capable of safely draining to ground the lightning...
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