# How can there be a zero sequence current in a single line to ground fault with an ungrounded neutral

The circuit that describes a single line to ground fault in a system with an ungrounded neutral is:

I neglect capacitance between phases and only look at capacitance to ground. The definition of zero sequence current is $$I^{(0)} = \frac{1}{3}(I_1 + I_2 + I_3)$$ But if apllied to the circuit above, Kirchoff current law should state that:$$(I_1 + I_2 + I_3) = 0$$ So how can there be a zero sequence current in this circuit? What am I missing here?

• If I take two actual capacitors and connect them between phases A-B and A-C will a zero sequence current flow in this circuit? Spice says that at each moment in time the sum of all phase currents will be 0. – Cmac c May 10 '20 at 18:40