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CIM Issues #6736

Quality61850 Class does not match the definition of Quality in IEC 61850-7-2

Added by Tom Berry about 1 year ago. Updated 11 days ago.

Status:
Closed
Priority:
Normal
Author/Contact Info:
Tom Berry
Base Release:
CIM17
Solution to be Applied To:
CIM18v16
Solution Version:
CIM18v16
Solution Applied By:
Chavdar Ivanov
Completion Date:
CIM Keywords:
61970-Meas
Breaking Change:
Yes
Breaking Change Description:
Two attributes have been moved from Quality61850 to MeasurementValueQuality (which is a subclass)
CIM Impacted Groups:
WG13
Requestor:
Tom Berry
Standard(s):

IEC 61970-301

Version:
Clause:
Sub-Clause:
Paragraph:
Table:
Originally Closed in Version:
Origination Date:
Origination ID:
Originally Assigned To:

Description

CIM definition is missing Inconsistent, Inaccurate Boolean
IEC 61850 does not define Source = DEFAULTED

Encoding is now
/* * Bit(s) Name Value
0-1 Validity Good 0 0
Invalid 0 1
Reserved 1 0
Questionable 1 1
2 Overflow
3 OutofRange
4 BadReference
5 Oscillatory
6 Failure
7 OldData
8 Inconsistent
9 Inaccurate
10 Source Process 0
Substituted 1
11 Test
12 OperatorBlocked
*/

Files

IEC 61850-7-2 pp45-48 qualityFlags.pdf View IEC 61850-7-2 pp45-48 qualityFlags.pdf 154 KB Tom Berry, 04/07/2025 02:28 AM
IEC 61850-7-2 Table D.1.pdf View IEC 61850-7-2 Table D.1.pdf 358 KB Tom Berry, 04/07/2025 02:50 AM

Proposed Solution

Update the CIM definition to match the IEC 61850 definition

Move the non-61850 attributes to MeasurementValueQuality

estimatorReplaced
suspect

Reference or replicate part of IEC 61850-7-2 Annex D and table D.1
D.1 Relation of the detailed quality identifiers with invalid or questionable quality

The reason for an invalid or questionable value of an attribute may be specified in more detail
with further quality identifiers. If one of these identifiers is set then validity shall be set to invalid
or questionable.

Decision

16-Sep-2024 Joint TF Hybrid Meeting - Minneapolis:

Reviewed together.

Action Item: Alex and Tom to check the issues and see what are low hanging fruits that can be easily fixed and which of the items will be followed up in the new TF subteam on the topic and which issues are to be assigned to CIM19

4-Dec-2024: TF13 call
Propose to get IEC 61850-7-2 Annex D table D.1 and see how many additional items we need to add. AI - Tom to give us some explanation.

18-Dec-2024: TF13 call
We had a final revisit of this Redmine issue and came to consensus that we can proceed to apply to the model class that exactly what we have in 61850. If we choose to extend this class then we must very clearly define what is extended and why and the specific usage of any extensions.

Release Notes

The following model changes were made for this issue:

For class Quality61850:
  • Class description was changed to: "Quality flags in this class are as defined in IEC 61850-7-2:2010+AMD1:2020. The source attribute has additional enumeration values."
  • Added new attribute Quality61850.inconsistent with description: "If true, an evaluation function has detected an inconsistency. Typically set within the measurement device or substation automation system."
  • Added new attribute Quality61850.inaccurate with description: "If true, the value does not meet the stated accuracy of the source. For example, the measured value of power factor may be inaccurate when the current is very small."
  • Moved attribute Quality61850.suspect to MeasurementValueQuality.suspect (breaking change).
  • Moved attribute Quality61850.estimatorReplaced to MeasurementValueQuality.estimatorReplaced (breaking change).
  • Updated description of MeasurementValueQuality.suspect to: "The value has been replaced (substituted) by a State Estimator application"
  • Updated description of MeasurementValueQuality.estimatorReplaced to: "A correlation function has detected that the value is not consistent with other values. Typically set by a network State Estimator."
  • Updated the Quality61850.validity description to:
    "Validity of the value, as condensed information for the client. In case this value is not 'good', some reasons may be found in other attributes. 'invalid' means that the value cannot be used. 'questionable' means that the value may or may not be used by the receiving application. For example a switch position measurement with oldData = true, may still be used by topology processing.

The reason for an invalid or questionable value of an attribute may be specified in more detail with further quality identifiers. If one of these identifiers {overflow, outOfRange, badReference, oscillatory, oldData, inconsistent, inaccurate, failure} is set then validity shall be set to invalid or questionable.

Reference: Table D.1 IEC 61850-7-2:2010+AMD1:2020
  • Updated the Quality61850.source description to: 
    "Defines the source (origin) of a value. The value may be acquired from the process, defaulted or substituted.

For values acquired through IEC 61850 based systems, the source can be "process" or "substituted". Substitution may be done in the acquisition device, in a communication device or within a CIM application."
Profile impacts:
  • The IEC61970-452 Operation profile utilized Quality61850. It will need to be updated to reflect the attribute changes.

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