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Osvaldo Rodríguez Villalón Abril-2012

CIRCUITOS TRIFASICOS
Materia de Circuitos Eléctricos II

Circuitos Trifásicos
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In this chapter we add a new dimension to ourstudy of ac steady-state circuits. Up to this point we have dealt with what we refer to as single-phase circuits. Now we extend our analysis techniques to polyphase circuits or, morespecifically, three-phase circuits (that is, circuits containing three voltage sources that are one-third of a cycle apart in time). We study three-phase circuits for a number of important reasons. Itis more advantageous and economical to generate and transmit electric power in the polyphase mode than with single-phase systems. As a result, most electric power is transmitted in polyphasecircuits. In the United States the power system frequency is 60 Hz, whereas in other parts of the world 50 Hz is common. The generation of electric power in the polyphase mode isaccomplished with an electric generator, which converts mechanical energy to electrical energy

Centrales Hidroeléctricas

Central Termoeléctrica

Central Nucleoeléctrica

Líneas deTransmisión

Transformadores Trifásicos

Sistema trifásico balanceado de voltajes

The vector sum of any number of vectors drawn such that the “head” of one is connected to the “tail”of the next, and that the head of the last vector is connected to the tail of the first is zero, we can conclude that the phasor sum of the phase voltages in a three-phase system is zeroConexiones Trifásicas

Conexión Estrella (Y)

Conexión Delta (∆)

Generador conectado en Y

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Secuencia de fases

Carga conectada en ∆

Relaciones de voltaje,corriente e impedancia en las conexiones Y y ∆

Generador conectado en Delta ∆

Potencia en Sistemas Trifásicos

Potencia Reactiva

Potencia Aparente

Factor de Potencia