62   RMS and avg Values

Created: 15 Mar 2005

Status: In Force (green)

Part: Part 7-3 (2003)



Clause: General


Category: No impact on this part


RMS and avg Values
The current CDCs MV and CMV in IEC 61850-7-3 do not provide explicit rms values. The CDCs for harmonic Data provide rms values.
In some cases the data of LNs are explicitly defined as rms data (CDC=MV), e.g., the Vol and Amp in the LN MMXN (non phase related measurements). In other cases like the LN MHAI we have data, e.g., HRmsA (CDC=WYE) that have the rms semantic tagged in the name.

In the wind power plant standard IEC 61400-25 we need rms, average, and standard deviation of analogue values.

Klaus-Peter proposed for CMV: We may define for the CMV (mainly used for electrical three-phase values) that the mag-value of the vector shall be a rms value if the "ang" value is not present. In this case we also need to
define that the attribute rmsCyc is implicitly 1 period.

What do you think?

This cannot be applied for MV because the attribute has no "ang".

I suppose a new CDC as we have defined one IEC 61400-25. The name could be AMV (advanced MV) - this would be a specialization of MV. The additional DataAttributes could be:
- Sel ENUM [mag, rms, avg] CF M
- rms AnalogueValue MX dchg Conditional
- avg AnalogueValue MX dchg Conditional
- rmsTmms INT32U CF Conditional
- avgTmms INT32U CF Conditional
We may define such a new CDC as part of the first amendment of 61850-7-3.


Clarify and discuss.

Discussion Created Status
no negative comment received on voting; set to green
see new TISSUE 256 for part 7-4
17 Nov 05 In Force (green)
set to final proposal

TISSUE to 7-4 will be added, after approval of this TISSUE
10 Oct 05 Ballot Period
Final proposal postponed, after the detail worked out solution of the statistical, and historical statistical Data. 01 Apr 05 Discussion (red)


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