Modified Differential Ground Fault Protection for Systems Having Multiple Sources and Grounds

This paper discusses the modified differential ground fault protection system, for the purpose of illustrating that 1) such systems are suitable for application on service equipment having multiple sources of electrical power, each of which may have multiple grounds, 2) such systems may be applied using conventional equipment that is currently available from several suppliers, 3) such systems can meet requirements for generator grounding without the use of four-pole transfer switches and switched neutrals, 4) such systems may be analyzed for effectiveness using conventional circuit analysis techniques.