Everything starts from the sun to Earth. Sun's surface water evaporated and the cloud. Winds brought clouds to move on. Pregnant clouds on its way and if close to the ground creates lightning. Maybe lightning was one of the first meteorological phenomenon that has attracted human attention. Thunderbolt is a high-energy electrical discharge between clouds and the Earth's pregnant, be in addition to the fatalities, and injuries directly or indirectly disrupt power equipment and network equipment. This may be the emergence of "voltage" or "strong magnetic field" of equipment or animals to be huge effect and cause damages. Statistics annual damages caused by lightning, represents the destructive power of this phenomenon is normal.
The purpose of installing lightning protection systems and people against lightning and make way for the massive flow of lightning into the ground, in such systems rods attract lightning conductors duty descending air flow into the transfer task to the network earthing have. Lightning-making system that is properly designed and installed safety of people and equipment safety will be followed.
Instant Lightning divided into two general categories:
Arstr Surge (Surge Protective Devise-SPD) is the term IEC in devices that want to limit transient voltages (Transient Voltages) and currents are unusual. It has different names in different countries.
sometimes the name of the technology used
Risks of electromagnetic permanent existence in the space around us, such as natural hazards like lightning and risks such as radar systems, diesel generators, welding machines, wireless or any other radiation, it is increasingly realized the importance of safety, electromagnetic comprehensive.
Man-made electromagnetic wave propagation naturally exist in the environment. Man-made sources include radio transmitters, radars, electrical switches, brushless electric motors is electromagnetic Vtslyhat.
Lightning surges frequently invade the electronic systems through AC power supplies, it is necessary to install the surge protective devices (SPDs) on the supply lines to protect the electronic equipment against lightning overvoltages.
Distance protection relay is the name given to the protection, whose action depends on the distance of the feeding point to the fault. IF the distance which is measured is less than the considered value for relay, the relay will protect the system and operate.
Only by using the Distance relay, all faults in any location of system can be cleared. So, Distance relays are the best relays for protecting transmission energy systems. Even in high voltage and medium voltage systems, Distance relays are used.
Any internal fault inside the stator winding is cleared by mainly differential protection scheme of the generator or alternator.The differential protection is provided in the generator by using longitudinal differential relay.