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Hunter: The Reckoning Redeemer. Strong electric fields from high voltages applied to small or pointed conductors often produce violet-colored corona discharges in air, as well as visible sparks.
Voltages below about — volts cannot produce easily visible sparks or glows in air at atmospheric pressure, so by this rule these voltages are "low".
However, under conditions of low atmospheric pressure such as in high-altitude aircraft , or in an environment of noble gas such as argon or neon , sparks appear at much lower voltages.
While lower voltages do not, in general, jump a gap that is present before the voltage is applied, interrupting an existing current flow with a gap often produces a low-voltage spark or arc.
As the contacts are separated, a few small points of contact become the last to separate. The current becomes constricted to these small hot spots , causing them to become incandescent, so that they emit electrons through thermionic emission.
Even a small 9 V battery can spark noticeably by this mechanism in a darkened room. The ionized air and metal vapour from the contacts form plasma, which temporarily bridges the widening gap.
If the power supply and load allow sufficient current to flow, a self-sustaining arc may form. Once formed, an arc may be extended to a significant length before breaking the circuit.
Attempting to open an inductive circuit often forms an arc, since the inductance provides a high-voltage pulse whenever the current is interrupted.
AC systems make sustained arcing somewhat less likely, since the current returns to zero twice per cycle. The arc is extinguished every time the current goes through a zero crossing , and must reignite during the next half-cycle to maintain the arc.
Unlike an ohmic conductor, the resistance of an arc decreases as the current increases. This makes unintentional arcs in an electrical apparatus dangerous since even a small arc can grow large enough to damage equipment and start fires if sufficient current is available.
Electrical transmission and distribution lines for electric power typically use voltages between tens and hundreds of kilovolts. The lines may be overhead or underground.
High voltage is used in power distribution to reduce ohmic losses when transporting electricity long distance. It is used in the production of semiconductors to sputter thin layers of metal films on the surface of the wafer.
It is also used for electrostatic flocking to coat objects with small fibers that stand on edge. Spark gaps were used historically as an early form of radio transmission.
Similarly, lightning discharges in the atmosphere of Jupiter are thought to be the source of the planet's powerful radio frequency emissions.
High voltages have been used in landmark chemistry and particle physics experiments and discoveries. Electric arcs were used in the isolation and discovery of the element argon from atmospheric air.
Induction coils powered early X-ray tubes. Moseley used an X-ray tube to determine the atomic number of a selection of metallic elements by the spectrum emitted when used as anodes.
High voltage is used for generating electron beams for microscopy. Cockcroft and Walton invented the voltage multiplier to transmutate lithium atoms in lithium oxide into helium by accelerating hydrogen atoms.
The voltage at which there is the danger of electrocution depends on the electrical conductivity of dry human skin.
Living human tissue can be protected from damage by the insulating characteristics of dry skin up to around 50 volts.
Accidental contact with any high voltage supplying sufficient energy may result in severe injury or death. This can occur as a person's body provides a path for current flow, causing tissue damage and heart failure.
Other injuries can include burns from the arc generated by the accidental contact. These burns can be especially dangerous if the victim's airway is affected.
Injuries may also be suffered as a result of the physical forces experienced by people who fall from a great height or are thrown a considerable distance.
Low-energy exposure to high voltage may be harmless, such as the spark produced in a dry climate when touching a doorknob after walking across a carpeted floor.
The voltage can be in the thousand-volt range, but the average current is low. The standard precautions to avoid injury include working under conditions that would avoid having electrical energy flow through the body, particularly through the heart region, such as between the arms, or between an arm and a leg.
Electricity can flow between two conductors in high voltage equipment and the body can complete the circuit.
To avoid that from happening, the worker should wear insulating clothing such as rubber gloves, use insulated tools, and avoid touching the equipment with more than one hand at a time.
An electrical current can also flow between the equipment and the earth ground. To prevent that, the worker should stand on an insulated surface such as on rubber mats.
Safety equipment is tested regularly to ensure it is still protecting the user. Test regulations vary according to country. Testing companies can test at up , volts and offer services from glove testing to Elevated Working Platform or EWP testing.
Contact with or close approach to line conductors presents a danger of electrocution. Contact with overhead wires can result in injury or death.
Metal ladders, farm equipment, boat masts, construction machinery, aerial antennas , and similar objects are frequently involved in fatal contact with overhead wires.
Unauthorized persons climbing on power pylons or electrical apparatus are also frequently the victims of electrocution. Digging into a buried cable can also be dangerous to workers at an excavation site.
Digging equipment either hand tools or machine driven that contacts a buried cable may energize piping or the ground in the area, resulting in electrocution of nearby workers.
A fault in a high-voltage transmission line or substation may result in high currents flowing along the surface of the earth, producing an earth potential rise that also presents a danger of electric shock.
For high voltage and extra-high voltage transmission lines, specially trained personnel use " live line " techniques to allow hands-on contact with energized equipment.
In this case the worker is electrically connected to the high-voltage line but thoroughly insulated from the earth so that he is at the same electrical potential as that of the line.
Since training for such operations is lengthy, and still presents a danger to personnel, only very important transmission lines are subject to maintenance while live.
Outside these properly engineered situations, insulation from earth does not guarantee that no current flows to earth—as grounding or arcing to ground can occur in unexpected ways, and high-frequency currents can burn even an ungrounded person.
Touching a transmitting antenna is dangerous for this reason, and a high-frequency Tesla coil can sustain a spark with only one endpoint.
Protective equipment on high-voltage transmission lines normally prevents formation of an unwanted arc, or ensures that it is quenched within tens of milliseconds.
Electrical apparatus that interrupts high-voltage circuits is designed to safely direct the resulting arc so that it dissipates without damage.
High voltage circuit breakers often use a blast of high pressure air, a special dielectric gas such as SF 6 under pressure , or immersion in mineral oil to quench the arc when the high voltage circuit is broken.
Wiring in equipment such as X-ray machines and lasers requires care. The high voltage section is kept physically distant from the low voltage side to reduce the possibility of an arc forming between the two.
To avoid coronal losses, conductors are kept as short as possible and free of sharp points. If insulated, the plastic coating should be free of air bubbles which result in coronal discharges within the bubbles.
A high voltage is not necessarily dangerous if it cannot deliver substantial current. Despite electrostatic machines such as Van de Graaff generators and Wimshurst machines producing voltages approaching one million volts, they deliver a brief sting.
That is because the current is low, e. The discharge may involve extremely high voltage over very short periods, but to produce heart fibrillation, an electric power supply must produce a significant current in the heart muscle continuing for many milliseconds , and must deposit a total energy in the range of at least millijoules or higher.
Relatively high current at anything more than about fifty volts can therefore be medically significant and potentially fatal.
During the discharge, these machines apply high voltage to the body for only a millionth of a second or less. So a low current is applied for a very short time, and the number of electrons involved is very small.
Despite Tesla coils superficially appearing similar to Van de Graaff generators, they are not electrostatic machines and can produce significant radio frequency currents continuously.
The current supplied to a human body will be relatively constant as long as contact is maintained, unlike with electrostatic machines which generally take longer to build up charges, and the voltage will be much higher than the break-down voltage of human skin.
As a consequence, the output of a Tesla coil can be dangerous or even fatal. Depending on the prospective short-circuit current available at a switchgear line-up, a hazard is presented to maintenance and operating personnel due to the possibility of a high-intensity electric arc.
Maximum temperature of an arc can exceed 10, kelvins , and the radiant heat, expanding hot air, and explosive vaporization of metal and insulation material can cause severe injury to unprotected workers.
Such switchgear line-ups and high-energy arc sources are commonly present in electric power utility substations and generating stations, industrial plants and large commercial buildings.Erfolg mehr. Hochspannungs- oder Niederspannungsmaschinen. Zur Zündung einer Hochdruckentladungslampe https://levelexchange.co/online-casino-mit-startguthaben/beste-spielothek-in-altmatt-finden.php ein Hochspannungspulsgenerator verwendet, der als Transformator wirkt. Stimmt das? Deutschland Europa Ausland Konjunktur. Stellenmarkt Mit unserem Karriere-Portal den Traumjob finden. Impressum Datenschutzerklärung Adblocker deaktiviert? Many translated example sentences containing "high voltage" – German-English dictionary and search engine for German translations. Englisch-Deutsch-Übersetzungen für high voltage im Online-Wörterbuch levelexchange.co (Deutschwörterbuch). Erfahren Sie News und Wissenswertes zum Thema High Voltage. WirtschaftsWoche Online, das Online-Portal des führenden Wirtschaftsmagazins in. The inventive windings are suitable i.a. for rotary electrical high-voltage or low-voltage machines. Die erfindungsgemässen Wicklungen eignen sich u.a. für. We specializes in High Voltage. Work with us on your specific needs, and see how our expertise can bring you overall savings. PRODUKTE.