Why star connection is used in generator?

Alternators are connected primarily in star to achieve the following motives: Lesser stress on insulation and Copper saving: Voltage per phase is less for a given line voltage which reduces insulation requirement and this also reduces the number of turns hence copper is also saved.

What is double star connection?

For three-to-six phase conversion, three identical 1-phase transformers are used, whose secondary windings are divided into two equal sections. The primary windings of the three transformers must be connected in delta.

What is double delta wiring?

It is frequently termed “double delta part winding” because it utilizes a standard part winding starter and has characteristics that are similar to the part winding starting. The advantage of double delta is that all of the winding is connected during the start cycle, and the rate of heating is not so severe.

How does a dual speed motor work?

The two winding motor is made in such a manner that it is really two motors wound into one stator. One winding, when energized, gives one of the speeds. When the second winding is energized, the motor takes on the speed that is determined by the second winding.

Why is double layer winding preferred?

Double layer windings in open slots have the following advantages over single layer windings in semi-closed slots. 1. Ease in manufacture of coils and lower cost of winding 2. Less number of coils are required as spare in the case of winding repairs 3.

What is the main purpose of double cage in double cage induction motor?

A Double Cage Induction motor is that type of motor in which a double cage or two rotor windings or cages are used. This arrangement is used for obtaining high starting torque at a low value of starting current. The stator of a double cage rotor of an induction motor is the same as that of a normal induction motor.

What is generator winding?

A simple generator has two basic parts – field and winding. The field is the magnetic field and the winding is the conductor formed into a coil. The field is connected to a shaft that may be turned. These are two elements. necessary for electromagnetism.

Which winding is used in stator of the induction motor?

field winding
The winding wound on the stator of three phase induction motor is also called field winding, and when this winding is excited by three phase ac supply, it produces a rotating magnetic field.

What are the advantages of star connection of generator armature winding?

Advantage of STAR Connection of Generator Armature Winding: Generator Armature Winding is connected in STAR to achieve technical and economical advantages. Following are some of the advantages: 1) STAR connection provides a neutral point. This neutral point is very important from the stability point of view of generator.

Why alternator winding is connected in Star and not in Delta?

Alternator or generator armature winding is always connected in STAR not in DELTA. We know that rotating magnetic filed in the air gap can only be created if the phase winding and phase currents are 120º displaced from each other in the space and time respectively.

What is a star connection in a generator?

1) STAR connection provides a neutral point. This neutral point is very important from the stability point of view of generator. Generally, the neutral point is grounded through NGR (Neutral Grounding Resistor). Neutral grounding provides a path for the flow of circulating current during the unbalanced loading condition of generator.

What is the difference between star connection and Delta Connection?

Therefore for generating the same line voltage, the requirement of number of turns in STAR connection of armature winding will be less as compared to DELTA connection. 4) STAR connection eliminates the triplen harmonics in the generated terminal voltage of generator armature winding.