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английский) 3:
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three phase electric power is a particular case of multiphase systems, electrical circuits, alternating current, which are created by the source of same frequency синусоидальные emu, crazy friend on friend in time at a particular phase angle. in трёхфазной system, this angle is equal to 2π / 3 (120°).многопроводная трёхфазная ac system invented by nikola tesla. a significant contribution to the development of трёхфазных systems made. oh. доливо - dobrovolsky, who first suggested the three and четырёхпроводную ac transmission systemeach of the operating voltage is in the phase of a periodic process. the "phase" is a native of the emu. in трёхфазных systems shift angle is 120 degrees. фазные conductors are identified by the rf fields in the digital index of 1, 3, or a, b and cthe advantages of трёхфазной electricity system.the economical power transmission over long distances.the lower material requirements 3 фазных transformers.the lower material requirements power cables, as in the same power consumption decreasing currents in the phases.- equilibrium system.- the possibility of a simple receipt a round rotating magnetic field necessary for the work of the electric motor and other electrical devices.- the possibility of a two - фазного installation working voltages and line, and two power levels when connecting to the звезду» or triangle.- the ability to drastically reduce flicker and стробоскопического effect on fluorescent lamps lightingwith these advantages, трёхфазные system prevalent in modern electric power industry.the star is such a connection, when the ends of phase windings of generator (g) connected to a common point (neutral point or neutral. the ends of the phases of the consumer (m) also join together in a common point.the маркируют belonging to different phases, different colors. different colors маркируют as neutral and protective agents. this is done to ensure adequate protection from injury of electric shock, and also for the convenience of maintenance, installation and maintenance of electrical installations and electrical equipment. in different countries have their different marking agents.
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