Ground-Fault Protection
A variety of factors can contribute to the development of ground faults and unless an appropriate ground-fault device is used, low-current ground faults can often go unrecognized and cause serious damage.
BESSs are usually ungrounded systems. The system may remain in operation after the first ground fault, resulting in higher voltage on the unfaulted bus with reference to ground but with no current flow. However, subsequent ground faults on the opposite bus, can have catastrophic consequences from both an equipment-protection and worker-safety perspective. Ungrounded, and even grounded BESSs, although not as common, require ground-fault detection and protection to keep systems operating.