Comparing Star vs Delta Connection Alternators

[karim102]

Hi ,
I want to know something about Alternator. first what is the different between Star Connection Alternator and Delta Connection Alternator, and why if we want to find the Line Voltage from Star we use this formula Line Voltage = 1.73 * phase Voltage, exactly why 1.73, where did they give it? and also when we want to find Line Currnet from Delta Altrenate we use this formula Line Currnet= 1.73 * Phase Currnt, exactly why also 1.73?

Thanks for help

I appreciate it

 

[dlgoff]

"exactly why 1.73"

It's the square root of 3.
http://www.madsci.org/posts/archives/jan2001/979920827.Eg.r.html"

 

[ravenprp]

Hi there,

The main difference between Star and Delta Connection Alternators is the way the windings are connected. In a Star Connection Alternator, the three windings are connected in a triangular shape, while in a Delta Connection Alternator, the windings are connected in a delta or "V" shape.

The reason for using the formula Line Voltage = 1.73 * Phase Voltage is because in a Star Connection, the Line Voltage is the voltage between any two of the three windings, while the Phase Voltage is the voltage between one winding and the neutral point. This means that the Line Voltage is higher than the Phase Voltage by a factor of 1.73, which is the square root of 3.

Similarly, in a Delta Connection, the Line Current is the current flowing through any one of the three windings, while the Phase Current is the current flowing through one winding. The Line Current is higher than the Phase Current by a factor of 1.73, which is again the square root of 3.

The 1.73 factor is a mathematical calculation based on the geometry of the connections and is used to accurately calculate the Line Voltage and Line Current in both Star and Delta Connection Alternators.

I hope this helps clarify the differences and the use of the 1.73 factor. Let me know if you have any further questions. Good luck with your research!