Easy to create and hard to detect, ground loops can only be prevented through proactive design and strict NEC compliance.

Abstract: In this paper, a novel adaptive stator ground fault protection scheme based on third-harmonic differential voltages is implemented on a lab scale synchronous generator. The lab scale ...

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.