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A neutral isn't 'generated'. The neutral exists naturally at the star point of a star-connected system -i.e. the common point of connection between the three phases which is normally connected to earth, either directly, or via some sort of impedance which is designed to restrict the value of any fault current that might occur.
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Diagram of star-delta connection of motor?
Unfortunately, WikiAnswers does not support graphic images, so I will have to describe the connection in words. There are three windings, each with two wires. That is six connections. There are four connections in a star (wye) source, three hots and a neutral. The star connection has one end of all three windings connected (together) to neutral and the other ends connected to each hot. The delta connection has each winding connected end-to-end to each other in a ring, and each common point is connected to a hot. Neutral is not used in delta.
Where can one find a neutral connection point?
A person can find a neutral connection point is testing the continuity of every neutral connection. This technique will enable a person to find a bad connection point.
Why star point of star connected motor is not grounded?
Another AnswerA motor represents a balanced three-phase load and, therefore, there is no neutral current, so there is no requirement for a neutral connection. Regulations prevent an earth being used as return, so the star point shouldn't be earthed either.
When is a motor in star or delta connection?
Star (or wye) connection is where each of the three phases has a fourth conductor, neutral, as its current return. Current flow in this configuration is phase to neutral, which is also grounded back at the distribution center. There will be five total connections, phase A, B, and C, neutral, and (protective earth) ground. Delta connection is where each of the three phases uses the prior phase as its current return. Current flow in this configuration is phase to phase, and there is no neutral, though there is still a ground. There will be four total connections, phase A, B, and C, and (protective earth) ground.
Why neutral for High voltage?
High voltage transmission and distribution lines utilise three-phase electricity. There are two commonly-used connections used in this system, termed a 'delta' and a 'star' (or 'wye') connection. A delta connection provides three energised conductors, termed 'line conductors', while a star connection provides three energised conductors ('line conductors') together with a neutral conductor. However, in the case of a star connection, provided the load is balanced, no current flows through the neutral conductor. In the case of high-voltage transmission and distribution lines, their loads are very close to being balanced, so there is no need to provide a neutral in the case of a star-connected system, as any slight imbalance can be compensated for in slightly different line currents.
