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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.
Why zero sequence current cannot flow through a star connected machine unless the neutral is grounded?
If the neutral point is not earthed than the zero sequence current will not have any return path.It will be an open circuit for the zero sequence circuit.
What is the purpose of star delta connection in a transformer?
A star winding has a red yellow and blue phases. The centre point of every stay winding is used as d nuetral point. Hence the star winding in a transformer enables a nuetral point.
What is star connection in datail?
If you can imagine a machine's three phase windings with a common point of connection, thus forming a 'star' shape, with each phase winding displaced from each by 120 degrees. The 'free' ends of the three phase windings are then connected, externally, by wires called 'line conductors', while the common point of connection (the 'star point') is (in the case of generators and transformer secondaries) earthed (grounded) and connected, externally, by a wire called the 'neutral conductor'.The voltages measured between any pair of line conductors are called 'line voltages', and the voltages measured between any single line conductor and the neutral conductor (i.e. across individual phase windings) are called 'phase voltages'. A line voltage is the vector sum of its phase voltages, making in 1.732 times the value of a phase voltage.
Wiring diagram to convert a 3 phase 480 volt generator to 277 volt?
You should not need a wiring diagram. If the generator has a star point (wye) connection then the phase voltage to ground (star point) is 277 volts. 480/1.73 = 277.
What is the star point of a CT?
The term, 'star point', refers to the common point of connection for the three windings of a star-connected (wye-connected) transformer connection. The star point is usually earthed (grounded) and provides the neutral point of the connection.
Why it is necessary to earth the star point of three phase circuit?
The star or neutral point is earthed at the supply transformer to prevent the system building up a static electric charge in dry weather.
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.
North star is most accurate celestial body to calculate?
The North Star points towards the compass point North.
Why zero sequence current cannot flow through a star connected machine unless the neutral is grounded?
If the neutral point is not earthed than the zero sequence current will not have any return path.It will be an open circuit for the zero sequence circuit.
Is zenith and north star the same?
No. The North Star, also called Polaris, is a star that is almost directly above the north pole. The zenith is the highest point an object reaches in the sky.
In order to determine if an object is moving you must observe the object in relation to a?
. . .point of reference. For example, one can tell whether a planet is moving according to its position in relation to a star.
What does the Doppler shift in starlight give us?
It tells us whether a star (or galaxy, or other object) is moving towards us, or away from us; and how fast.
What does earth's axis point towards?
Currently the Earth's pole points toward Polaris in Ursa Minor. 5000 years ago it pointed towards Vega.
A place or object used for comparison to determine if something is in motion is called a what?
In theory, you can never truly detect if an object is in motion. Although I may travel in my car on the highway, I am not wrong to say that instead of myself moving across the earth, the earth is moving under me! Relativity proves to us that it is impossible to accurately show if an object is in motion or not. From a mathematical perspective, an object that you assume to be moving must be set relative to another object. This is in order to make accurate calculations about the object in question.
What information does the light of a star or other heavenly bodies give us?
Spectral analysis of that light can identify the object's elemental composition, measure its velocity towards or away from us, measure its acceleration towards or away from us, etc.
How many rotations per second would an object with the circumference of the largest star produce if it was spinning at 62500 miles per second?
If a point on the equator of the star was moving at that speed, the star would be rotating at approx 43.5 times a second.
