"...but it reverses some of the flow on the feeder from its
location back toward the substation. Unless its output is
greater than the load on the entire feeder, it creates a “zero
point” between it and the substation, where current flow is
zero due to the back flow from the DG...."
http://www.labspot.ufsc.br/~diego/T&D.pdf

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Note added at 28 mins (2012-02-12 13:44:23 GMT)
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"and current levels were at their negative peaks when voltage was at its zero point; in a transformer that has been sitting idle, however, both magnetic flux and winding current should start at zero."
http://www.opamp-electronics.com/tutorials/inrush_current_2_...