High-Resistance Grounding of 2400-Volt Delta Systems with Ground-Fault Alarm and Traceable Signal to Fault

A method is described which has been used to reduce the difficulties encountered on several old delta-ungrounded systems. Data are included which will help in applying this to any particular power system. The scheme gives an alarm whenever a ground fault occurs, permits everything to keep running even more assuredly than with an ungrounded system, and provides a method for quickly locating the fault. Circuit diagrams and photographs of actual equipment are included, and operating practice is summarized.