Patent ID: 8331071

Claim:
An interconnection device for connecting a distributed energy resource (DER) having a first reactance-to-resistance ratio (X/R) to an electrical power system (EPS) via an EPS protector having a second X/R lower than the first X/R, the interconnection device comprising: a DER switch that includes: an input for receiving power from the DER when the interconnection device is installed between the DER and the EPS protector and the DER is operating; an output for providing, when said DER switch is closed, the DER is operating, and the interconnection device is installed between the DER and the EPS protector, the power to the EPS protector; and a switching device electrically connected between said input and said output, said switching device responsive to, when the interconnection device is installed between the DER and the EPS, an over-current from the DER so as to provide at said output a non-zero third X/R that is no greater than the second X/R.