Transformer Initial Inrush Current and Capacitor Fault Outrush Current
Transformer Initial Inrush Current and Capacitor Fault Outrush Current
(OP)
Transformer Inrush:
Is there a detailed standard method for calculating max transformer inrush current (initial starting inrush) during energizing a transformer? I know that the x/r is dynamic and that the inrush depends on when in time the transformer is energized relative to the residual flux residing in the core.
Capacitor Outrush:
Is there a method for calculating the max capacitor outrush current during a fault. Is is the same as the inrush current?
Inrush current = 1.2*root(2)*v(line-ground)*root(C/L)?
Is there a detailed standard method for calculating max transformer inrush current (initial starting inrush) during energizing a transformer? I know that the x/r is dynamic and that the inrush depends on when in time the transformer is energized relative to the residual flux residing in the core.
Capacitor Outrush:
Is there a method for calculating the max capacitor outrush current during a fault. Is is the same as the inrush current?
Inrush current = 1.2*root(2)*v(line-ground)*root(C/L)?






RE: Transformer Initial Inrush Current and Capacitor Fault Outrush Current
Just guessing on cap current (not sure)
Cap current assuming cap terminals are shorted to ground.
I guess there is assumed some internal resistance to limit current?
Then v(t)=V0*exp(-t/RC) where we might take V0 as peak value of line to ground voltage.
i(t) = C * dv/dt = -C*V0/(RC) * V0*exp(-t/RC)
i(t) = -V0/R * V0*exp(-t/RC)
I suspect due to the high frequency nature of the transient of shorting terminals, inductance might play a role as well.
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RE: Transformer Initial Inrush Current and Capacitor Fault Outrush Current
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RE: Transformer Initial Inrush Current and Capacitor Fault Outrush Current
RE: Transformer Initial Inrush Current and Capacitor Fault Outrush Current