Abstract—The use of Distributed Generation (DG) in powersystems has many possible benefits, but also presents manychallenges. Notable among these challenges is the effect DG canhave on overcurrent protection. This paper contains resultspertinent to the addition of DG to the IEEE 34 Node Test Feeder.After an overcurrent protection scheme was implemented for thebenchmark system, DG of various sizes was added at specificlocations. The impact of these generators was evaluated in termsof steady state normal and short circuit currents as well asprotection coordination. In the studies performed so far,generally DG did not adversely affect protection selectivity andcoordination for penetration levels of 20% of the original feederload, but there were some problematic situations. Theovercurrent protection must be modified so that the circuitremains correctly protected for specific DG cases.

Index Terms—Distributed generation, overcurrent protection,power distribution protection.

A. IEEE 34 Node Test Feeder

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B. Modeling Differences

°

C. Results

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A. Synchronous Generator

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B. Delta-Delta Transformer

A. Location

B. Capacity

A. Load Flow

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B. Short Circuit and Protection Coordination

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C. Summary

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Hamed B. Funmilayo

Karen L. Butler-Purry

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