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Additional info for IEEE Guide for Instrumentation and Control Equipment Grounding in Generating Stations

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The second is that each element of a grounding network has a Þnite resistance and impedance. The third is that there is an inherent transient immunity capability of discrete circuit elements. Care should therefore be taken to ensure that the environment will not exceed the speciÞc operating limits of the individual circuit elements. The fourth is that as local transients cause ground potentials to reach high values, currents may enter galvanically connected cable circuits and may also be coupled capacitively and inductively from grounded cable shields in the affected area into the signal conductors.

Since these conductors provide a lower impedance path than the cable shields, the fault or ground currents are diverted from the instrument cables. These conductors also help to limit the ground potential differences between the two mats during fault conditions. 4 CT, VT, and CCVT grounding Much has been written and standardized about the proper techniques to use when grounding these devices [B41]. The general consensus is that the secondary neutrals for these devices should be grounded at the entrance to the relay room rather than at the device.

Panel grounds with high noise levels should be checked. Check the panel thoroughly and correct any inadvertent grounds. This test is more effective if noise levels at various points are periodically monitored and recorded for future reference. When a problem occurs, the noise levels can then be compared with previously recorded values. Note that it is normal for some current to ßow in a ground system due to capacitive coupling between energized circuit conductors and ground conductors (such as shields).

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