479   %-change of measured values

Created: 08 Mar 2007

Status: In Force (green)

Part: Part 7-4 (2003)





Category: Issue for edition 2 of this part


(Question only)
Is there some idea for the Edition 2, how to model the "relative change of a measurand in some defined time interval" (gradient of a measurand) and also the status message, if some gradient-limit is exceeded ? For a lot of measurands the gradient is more important, than the absolute value, especially in monitoring systems.


Discussion Created Status
09 May 07 In Force (green)
10 Apr 07 Ballot Period
10 Apr 07 Ballot Period
It is understood that these changes happen slowly and are used not for protection (like df/dt) but for monitoring. Therefore, this issue may be solved by adding a new calculation method ("trend")in the statistical nodes. 23 Mar 07 Discussion (red)


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