0
Why three phase alternator windings are usually star connected?
Wiki User
∙ 9y agoWant this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
What is the working principal of 3 phase alternator?
A 3 phase alternator is an AC electrical generator with 3 sets of windings in the stator. These windings overlap each other in phase angle, or timing relationship, by 120 degrees with respect to each other. The rotor (field or excitation) current is DC, and is adjusted to regulate the output power.
Working principle of 3 phase alternator?
A three-phase alternator has three sets of windings that produce three currents. The three currents make up the three phases. Together these produce the total AC output of the stator. An alternator is made up of a stator and a magnet rotor which is also known as the flywheel.
How the three phase rectification is achieved?
You achieve three phase rectification with a three phase rectifier. There is one in the alternator of you car. You have three windings, connected delta, so there are three terminals. Three diodes are connected to these terminals, anodes towards the terminals, cathodes common and connected to the battery. Three more diodes (for a total of six) are connected to the terminals, cathodes towards the terminals, with the anodes common and connected to ground. At any one moment of time, one winding provides voltage to cause two diodes to conduct, charging the battery. As the alternator rotates, the windings and the diodes take turns, effectively providing a three phase AC to DC power source to the battery. If you look closely, there is another set of three, smaller, diodes connected as well, anodes towards the terminals. These diodes provide power for the integrated regulator, but the six main diodes are large and heatsinked into the frame of the alternator.
What is the difference between a Delta-connected and a Y-connected transformer?
With three windings, you have six terminals. Call them A1, A2, B1, B2, C1, and C2, representing phase A, B, and C. In the delta configuration, A1 is connected to C2, C1 is connected to B2, and B1 is connected to A2. Power is from phase to phase - A1C2, C1B2, and B1A2. In the wye configuration, A2, B2, and C2 are connected together, and are usually connected to neutral. Power is from phase to neutral - A1, B1, and C1.
Is 3 phase star transformer has more winding than delta?
The # of windings in a transformer are based on the primary and secondary voltages the transformer is rated for not the way the windings are connected.
What is constructional differences and features single and three phase transformer?
The major difference is that the core, usually having three limbs if it is a 'core-type' core (or five, for a 'shell-type' core), must accommodate six windings: three primary phase windings and three secondary phase windings. Some three-phase transformers may have additional windings ('tertiary windings', for example) for various other purposes.
How many windings does a single-phase transformer have?
Generally a single-phase transformer will have twowindings. One of the Low voltage side and one on the high voltage side. North-American distribution transformers will have three: one high-voltage winding, and two low-voltage windings connected in series.However......a single-phase transformer can also have several primary and several secondary windings. The primary windings can be connected in series or in parallel with each other, as can the secondary windings. For example, taking the primary winding as an example, it could consist of two 120-V rated windings: if connected in series, it could be supplied with 240 V without exceeding its voltage rating; if connected in parallel, it could be supplied with 120 V without exceeding its voltage rating. Multiwinding single-phase transformers allow for a variety of connections.
How a brush type 3 phase alternator works?
A pair of slip rings on the rotor carries current from the stationary brushes to the rotor windings in order to establish a magnetic field. As the alternator rotates, the magnetic field sweeps across the stator windings inducing an electric current in these windings. This current is an alternating current which is rectified via diodes and passed out of the alternator by means of the battery lead and (usually) the grounded alternator case. The battery voltage is sensed and used to vary the amount of current fed to the rotor in order to adjust the amount of current generated.
How can you convert 3 phase windings of generator into single phase?
If the windings are brought out separately, so they may be connected together in different ways (they are called "reconnectable" windings), then three-phase generators can be reconfigured for single-phase output by means of a "zig-zag" connection. Many connection diagrams for this configuration are available online. One drawback for this method is the output power is reduced to approximately 66% of the three-phase rating.
What is the difference between an alternator and a stator?
An alternator is a device that generates power for an automobile to run its electrical loads and to charge the battery. A stator is one of the internal parts of the alternator, specifically the stationary windings that generate the 3-phase AC.
How many windings are in universal motor?
one windingAnswerA three-phase motor has three phase windings, normally (but not necessarily) connected in delta.
Is there a neutral on a three phase transformer?
It depends on whether you are wye or delta connected. A transformer is a transformer, and a three phase transformer is simply three transformers. The key is in how you hook them up.AnswerIt depends on how the transformer is connected. If one set of windings is connected in star (or wye), then the star point is/canbe earthed and becomes the neutral for that particular connection; this is the standard connection for the secondary (low-voltage) of European distribution transformers. In North American three-phase distribution transformers, the secondary windings are connected in delta, and one phase is centre tapped, earthed, and that becomes the neutral point for a 240/120-V split-phase supply to a residence.This answer applies to both three-phase transformers, and to single-phase transformers which have been connected to form a three-phase transformer bank. (It is incorrect to say that a three-phase transformer is simply three single-phase transformers!)
