Issue:
A customer is wanting to know if the leap second will affect energy and power values provided by the PME system.

Product Line:
ION Enterprise 5.x
ION Enterprise 6.x
StruxureWare Power Monitoring 7.x
Power Monitoring Expert 7.x
Power Monitoring Expert 8.x
Power Monitoring Expert 9.0
Power Monitoring Expert 2020
Power Monitoring Expert 2021
Power Monitoring Expert 2022
Power Monitoring Expert 2023
Power Monitoring Expert 2024

Environment:
Power Monitoring Expert energy and power values

Cause:
Timekeepers have introduced an additional second to yearly time in order to account for drift.

Resolution:
The leap second handling is done within the Operating System. The Site Server component requests the current time from the OS, converts it into the timestamp format required by the device, and transmits it.

Data log record processing for on-board data logs is independent of the clock value. PC logged data takes the current clock value when generating the log record.  The only issue of concern with an extra second is that particular interval will be one second longer so power and demand calculations may be slightly off for some devices. This is only 1/900 or about 0.111% and is still within meter and software logging accuracy.

Some additional Microsoft articles below discuss how Windows handles the "leap second":

The story around Leap Seconds and Windows: It’s likely not Y2K
Part two of the story around Leap Seconds and Windows: #NotY2K

Publisert for: Schneider Electric Norway