What would be the effect of reversing one phase winding on a star connected three-phase alternator?
If one phase has the polarity changed, then the magnetic field distribution within the motor winding becomes uneven, and the output torque will “pulse”. The windings of 3-phase motor are not in same direction. For example 3 phase 60Hz 1770 RPM motor, so 4-poles in three phase a total 12 groups of magnetic wire coil.
In what two ways can the three phases of a three-phase alternator be connected?
The stator coils of three-phase alternators may be joined together in either wye or delta connections, as shown in figure 3-9. With these connections only three wires come out of the alternator. This allows convenient connection to three-phase motors or power distribution transformers.
What is phase sequence of 3 phase voltage?
In a three-phase system, the order in which the voltages attain their maximum positive value is called Phase Sequence. There are three voltages or EMFs in the three-phase system with the same magnitude, but the frequency is displaced by an angle of 120 deg electrically.
What is the difference between Star & Delta connection in 3 phase system?
In STAR Connection, the starting or finishing ends (similar ends) of three coils are connected together to form the neutral point. A common wire is taken out from the neutral point which is called Neutral. In DELTA Connection, the opposite ends of three coils are connected together.
Is 3 Phase A star?
Star Connection (Y) System is also known as Three Phase Four Wire System (3-Phase 4 Wire) and it is the most preferred system for AC power distribution while for transmission, Delta connection is generally used. Star Connection is also called Three Phase 4 wires (3-Phase, 4-Wires) system.
How do you connect three phase alternators together?
Three-Phase Connections. The primary windings, for example, are connected to each other to form a closed loop. Each of these junctions is fed with a phase voltage from a three-phase alternator. The alternator may be connected either delta or wye depending on load and voltage requirements, and the design of the system.
Can a 3-phase alternator be wired in a wye or delta configuration?
Whether to connect the three single-phase windings in a 3-phase AC alternator (or motor or transformer) in a wye or delta wiring configuration depends on the desired magnitude of the line voltage compared to the desired magnitude of the line current.
What is a StarStar 3 phase connection?
Star Connection in a 3 Phase System. The three conductors named as R, Y and B run from the remaining three free terminals as shown in the above figure. The current flowing through each phase is called Phase current Iph, and the current flowing through each line conductor is called Line Current IL.
What is the line voltage in a star connection?
Hence, in star connection line voltage is root 3 times of phase voltage. The same current flows through phase winding as well as in the line conductor as it is connected in series with the phase winding. Hence, in a 3 Phase system of star connections, the line current is equal to phase current.