Predicting Underground Distribution System Availability

The development of an elementary computer program package which can be used to predict the availability of a theoretical radial underground-distribution circuit from the substation to the home is described. The calculations are based on input values of outage rates and times required to perform specific functions. The programs are applied to circuit configurations with various combinations of fault indicators, fault current interrupters, manual sectionalizing points, and manual and automatic tie-point equipment on the main and lateral circuits. Illustrative results show the effect of variation in these items as well as in the basic circuit configuration and operating procedures.