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. The effects of lightning strikes to trees. 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. A lightning strike or lightning bolt is an electric discharge between the atmosphere and the ground. IMPULSE GENERATOR DESIGN TO INVESTIGATE INDIRECT LIGHTNING STRIKE EFFECTS ON UTILITY-SCALE PHOTO-VOLTAIC INSTALLATIONS K.M. The Novaris Systematic Approach to protecting a structure and its electrical services from these damaging effects includes two types of power protection products. Indirect effects. Electrochemical effects: The fleeting nature of lightning impacts mean that these effects are highly negligible and without influence on earth rods. 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. Flashovers and Strikes to Power Lines Results: Most lightning-related neurologic damage involves the CNS as opposed to the peripheral nervous system. How to protect sensitive electronics from a strike. 2.2.2 Indirect Lightning Strikes As well as direct lightning strikes, indirect effects can also be damaging. The lightning strike is likely to happen any time and is the root cause of over voltage fault in electrical system. Indirect effects. 1 Introduction Lightning is a natural electrical phenomena being the most spectacular to every common man. 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. 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. Indirect Effects include the electromagnetic effects on a system resulting from a lightning strike. an exit point of the AC/RC. 13,14 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. 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. The lighting strike can be divided in to two group. The purpose of the test is to simulate indirect effects produced by lightning strike with a test system and observe/asses the behaviour of EUT. In this project, simulation was used to determine the induced lightning transients at avionics box cable interfaces (indirect effects transient control levels). Figure 1: Examples of protection 4.2 Protection against indirect lightning Damage to a system can be caused even when the strike is not direct. Indirect shrapnel-related injuries from building materials have also been documented. Lightning can have a direct and indirect effect on objects, causing varying levels of injury and damage. The first known application of CEM for civilian certification of a complex transport aircraft occurred on the MD-90. Lightning is a strong electrical (e-lek-trih-kull) charge that can pass through or over your body. 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. The eye is dazzled and vision is lost for several long seconds. Following a description of the basic physical phenomena associated with direct and indirect lightning strikes, these effects are illustrated here by considering the effects of lightning strikes on residential houses, wind turbines, trees, airplanes, and power lines. lightning strikes. 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. As discussed above, the direct lightning strike on an aircraft causes indirect voltage transients due to magnetic or electric field coupling. Indirect lightning test is applicable to airborne equipment in different functional states. Direct impact causes physical damage to the structure due to the direct contact of lightning. Indirect effects mainly refer to the transient changes of induced currents in cables of aircraft caused by electromagnetic effect of lightning strikes. 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. inDIRECT Effect LIGHTNING TESTING. You may get burned from metal things that are on you, such as a belt buckle, zipper, or coins. Of all lightning discharges only around 25% of the 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. Although nine out of ten people hit by lightning survives, they may still suffer long-term injuries. Coetzer1, A.J. Lightning impacts. One is direct lightning strike and another is indirect lightning strike. You may be hurt if it hits you or something close to you. In 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 … These indirect effects … How to perform indirect lightning test? An indirect lightning strike can occur two different ways. Indirect effects are caused by transient electrical pulses produced by the changing electric and magnetic fields due to the lightning current. The first way is what is called a side flash. A less common type of strike, called ground-to-cloud (GC) lightning, is upward propagating lightning initiated from a tall grounded object and reaching into the clouds. 9,12 Furthermore, increased autonomic stimulation as a result of the shock received, with an associated catecholaminergic surge have additive effects on the heart rate and rhythm. When a direct lightning strike oc-curs, a large-amplitude current is injected at the point of injection. withstand direct lightning strikes is well known. Indirect hits by lightning strike are more common than direct strikes (Table 1) . A case series reported by Cherington et al. Indirect lightning side flashes occur when the current jumps from one object to … Rix2, and … items usually are exposed to lightning indirect effects and require case-by-case treatment. “Indirect lightning effects” is thereby the dedicated term used to describe the electromagnetic (EM) effects following a “direct lighting” strike. The following serves to … Direct lightning strike. Lightning testing is typically separated into Direct and Indirect Effects. Direct Strike - When lightning strikes a person directly; Contact Strike - When an object a person is touching has been struck by lightning; Side Splash - When lightning jumps from the primary strike object on its way to the ground; Ground Strike - When lightning strikes the ground and the current spreads out in a circle from the spot In this chapter, both direct and indirect effects of lightning flashes are described. Luminous effects: A lightning strike nearby violently sensitizes the retina of an observer. Periodic updates of this handbook are anticipated as additional test data and new The lightning strike directly falls upon the over head line or electrical equipment. You will usually feel better within hours or days after a mild lightning injury. 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. What is an indirect lightning strike? The huge rise in voltage accompanying lightning strikes can result in a massive direct current shock, which in turn is capable of depolarising the entire myocardium. Two common situations are described in Figure 1. EMA helped Douglas Aerospace save $1.6 M on the MD-90 indirect effects certification. Being struck by lightning is a rare event, and it can have some equally unusual medical effects. 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. In the first case, a lightning conductor is not necessary whereas in the second case an additional protection is needed. indirect effects have been enumerated, and the present understandings have been discussed. 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!