indirect lightning strike effects

It is well known that the normal operation of transmission and distribution systems is greatly affected by lightning, which is one of the major causes of power interruptions: lightning causes flashovers in overhead transmission and distribution lines, resulting in overvoltages on the line conductors that are due either to direct strikes or to nearby, indirect strikes. Keywords: Electric stress, Electromagnetic fields, Indirect effect, Lightning, Over voltages. The effects of lightning strikes to trees. DNB remains the industry leader in Indirect Lightning Effects testing. The protection of metal skins and structures is treated only briefly since other sources of lightning protection design information for metal airframes are readily available. 2.2.2 Indirect Lightning Strikes As well as direct lightning strikes, indirect effects can also be damaging. How to protect sensitive electronics from a strike. When a direct lightning strike oc-curs, a large-amplitude current is injected at the point of injection. Damage due to an aircraft lightning strike is categorized as either a direct effect or an indirect effect [1]. The following serves to … Of all lightning discharges only around 25% of the Indirect hits by lightning strike are more common than direct strikes (Table 1) . with 13 incidents found side splashes to be common . The direct effects of lightning include the physical damage due to the attachment of the very hot (35-50,000°F) and high-current (200,000+ amperes) lightning channel. Direct lightning strike. lightning strikes. Electrochemical effects: The fleeting nature of lightning impacts mean that these effects are highly negligible and without influence on earth rods. The most damaging interference is that of a direct or indirect lightning strike to the power line or a nearby strike which causes earth potentials to rise or induce interference onto power lines. For one 77-year-old woman who survived being hit by an indirect lightning strike while sitting in her car, those effects included losing her vision in one eye, according to a new report of her case. Understanding how to minimize the damage of indirect lightning strikes is critical in the oil and gas industry, as here are just a few examples of the potential damaged caused by indirect lightning strikes. In this chapter, both direct and indirect effects of lightning flashes are described. It can also protect underlying electronics against the indirect effects of lightning if joints and seams are electrically bonded to avoid gaps and holes in the enclosure. withstand direct lightning strikes is well known. Indirect lightning is defined as lightning that strikes one place but "induces consequences remotely" said Richard Kithil of the National Lighting Safety Institute, a Denver-based group. Direct impact causes physical damage to the structure due to the direct contact of lightning. Direct effects include the burning and shattering of materials and the direct conduction of lightning voltages into electrical and electronic circuits resulting in burnouts of equipment. Objective: To review neurologic sequelae of lightning strikes, to consider prevention and management, and to discuss current knowledge about the mechanism of lightning damage to tissues. Direct Effects include all the physical damage caused by lightning strikes such as burning, melting, arcing, blasting, and punctures. In The first known application of CEM for civilian certification of a complex transport aircraft occurred on the MD-90. Being struck by lightning is a rare event, and it can have some equally unusual medical effects. Lightning strikes can affect the electrical (and/or electronic) systems of a building in two ways: by the direct impact of the lightning strike on the building (see Fig. For example if lightning strikes a building or any of the services mentioned above, transient overvoltages may be caused through resistive, inductive and capacitive coupling. Rix2, and … For example, if a lightning strike attachment damages an antenna mounted on the outer structure of an aircraft, this is categorized as direct effect damage from the lightning strike. Flashovers and Strikes to Power Lines A side flash is another form of an indirect lightning strike, as this type of lightning strikes an object and hits another object through the air instead of the ground. Indirect Effects include the electromagnetic effects on a system resulting from a lightning strike. Such overvoltages can be classified according to their point of impact: Direct, Near (indirect) or; Distant lightning strikes. The lighting strike can be divided in to two group. J5 a); by indirect impact of the lightning strike on the building: A lightning stroke can fall on an overhead electric power line supplying a … You will usually feel better within hours or days after a mild lightning injury. How to perform indirect lightning test? The first way is what is called a side flash. Indirect lightning test is applicable to airborne equipment in different functional states. A case series reported by Cherington et al. Lightning can have a direct and indirect effect on objects, causing varying levels of injury and damage. EMA helped Douglas Aerospace save $1.6 M on the MD-90 indirect effects certification. What is an indirect lightning strike? You may get burned from metal things that are on you, such as a belt buckle, zipper, or coins. In the first case, a lightning conductor is not necessary whereas in the second case an additional protection is needed. Two common situations are described in Figure 1. Coetzer1, A.J. The Novaris Systematic Approach to protecting a structure and its electrical services from these damaging effects includes two types of power protection products. In this project, simulation was used to determine the induced lightning transients at avionics box cable interfaces (indirect effects transient control levels). With more than 25 years of Lightning testing experience, DNB Engineering Inc. was the first lab in the world to produce multiple burst test waveforms to AC 20-136 specifications! Lightning is a strong electrical (e-lek-trih-kull) charge that can pass through or over your body. A lightning strike or lightning bolt is an electric discharge between the atmosphere and the ground. 13,14 Indirect lightning side flashes occur when the current jumps from one object to … Lightning testing is typically separated into Direct and Indirect Effects. You may be hurt if it hits you or something close to you. inDIRECT Effect LIGHTNING TESTING. The experimental results indicated that, with the indirect lightning strikes, the extent of shiitake fruiting almost doubled compared to the case without the indirect lightning strikes.

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