Finding fault - Locating a ground fault in low-voltage, high-resistance grounded systems via the single-processor concept for circuit protection

High-resistance grounded systems have distinct advantages over solidly grounded systems in facilities where very reliable delivery of power to the loads is desirable. Unlike solidly grounded systems, resistance- grounded systems are able to operate continuously with one unintentional ground. However, this is true for only the first ground fault. A second ground fault on another phase and circuit breaker allows a phase-to-phase fault that may be of significant magnitude.