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fault current calculation at generator and downstream panel

fault current calculation at generator and downstream panel

fault current calculation at generator and downstream panel

(OP)
Hi,

I have to use point-to-point method to calculate fault current current and submit to Florida state. How to we calculate fault current at emergency generator and its first downstream panel?

I mean I have standby 250kW, 480V/3PH, emergency generator EG1 which feeds emergency panel 'EDPH' and panel 'EDPH' will feeds ATS1 and ATS2.

They are looking for fault current at EG1 and panel 'EDPH'. ATS1 and ATS2 are also fed out of normal power source which I knew how to calculate the fault current at these points.


Thanks!

anbm


 

RE: fault current calculation at generator and downstream panel

So you develop an impedance diagram, showing the generator impedance (sub-transient reactance) and the cable impedances.  Then reduce this to an equivalent impedance at each point where you need to know the fault current.  

Then calculate the current (I = V/Z)

RE: fault current calculation at generator and downstream panel

(OP)
7anoter4,

Can you give me full name of all of variable in the calculation? Thanks!

anbm

RE: fault current calculation at generator and downstream panel

anbm:

Buy and read up IEEE Red Book.

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