Standardization of Benchmarks for Protective Device Time-Current Curves

This paper reviews the history of time-current curves and the development of time-current curve techniques and practices leading up to the present day standards. A format will be suggested for the calculation and Illustration of benchmarks on time-current curves. The discussion will encompass medium and low-voltage coordination benchmarks as well as Identification of time-current curve elements. A brief discussion of time-current curve production using computer graphic techniques is also Included.