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How the Current Draft Standard of NERC PRC-005-2 Maintenance Requirements will Reduce Battery System Reliability

Peter J. DeMar

The existing proposed NERC PRC-005-2 maintenance requirements standard allows for the substitution of internal ohmic measurements in place of load testing. This is a step backward in assuring operability of the station battery. This paper will show that there has been substantial proof that internal ohmic measurements cannot be used for proving capacity or capability and recommends that this substitution not be allowed.

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