sum of 3 phases?

[emadshaaban]

hi
If i knew the current flows in each phase,could i calculate the leakage currents(F64 anci).or even the neutral current

 

[waross]

You would also need to know the phase angles. You may then calculate the current returning to the neutral of the supply source. This will be the sum of neutral currents and leakage current to ground. The phase to phase leakage will be part of the line currents.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[emadshaaban]

thank you warass
But what is the equation for this calculation?

 

[waross]

If you know the magnitude and phase angle of each current perform vector addition of the three values. If the currents balance, the vector diagram will return to the origin and form a closed figure. If the diagram does not return to the origin the difference or the open gap will represent the neutral current.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[jghrist]

In = Ia + Ib + Ic (using complex values, not magnitudes)
The leakage current is something different. This depends on the insulation resistance and capacitance.

 

[emadshaaban]

thankyou.
IN=Ip1 SIN(A+0)+Ip2 SIN(A+120)+Ip3 SIN(A+240)

A=???phase angle???

 

[davidbeach]

But the phase separation isn't necessarily 120 degrees. In a fully balanced system, sure, but in the real world not so much.

 

[emadshaaban]

than you