Related Products:

EGMA-004, EGMA-005, EGMA-006, EGMA-007, EGMA-008, EGMA-013, EGMA-015, EGMA-016, EGMA-019

Related Documents:

EZDP-2020 and EZDP-2038




Premium Monitoring System, Troubleshooting, Rope Faults


This article contains considerations to investigate a possible fault indication involving the grounding current stepping down.

Average and/or Zero-to-Peak Grounding Current Steps Down

If you notice an unusual step down in grounding current, it may be a significant event. Has something else contacted the shaft, or has a bearing lost insulation allowing alternate paths to ground? Is the rope-to-shaft contact of good integrity to allow current to flow freely when voltage is present? When grounding current is markedly different from what is normally seen on the generator and there is no correlating operating condition to explain it, the grounding system should be investigated to assure that grounding is still taking place properly. Here again, it is good to be familiar with what values are normal for your generator when it is online, on turning gear, offline, and at varying load levels.

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