Overcurrent Protection for the IEEE 34-Node Radial Test Feeder

The IEEE 34-node radial test feeder is a benchmark circuit for validating results from existing and novel load-flow algorithms. This paper discusses the addition of overcurrent protection (OCP) to the test feeder using off-the-shelf protective devices. The OCP scheme includes a recloser near the substation and fuses at the laterals. These OCP devices represent the conventional types present in most distribution systems. DIgSILENT Power Factory 13.1 was used to conduct the load-flow analysis, customize the OCP devices, and perform overcurrent protection studies on the test feeder. Recloser-fuse and fuse-fuse coordination tests were conducted. Results from the coordination studies showed that the assigned OCP devices provided adequate trip coordination for all fault types on the test feeder. The short-circuit results and overcurrent protective device data provided in this paper may serve as an extension to the test feeder's existing load-flow data.