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Table 2 Interpretation of detailed quality for sampled values subscribed by protection functions

From: Towards a standardisation for digital inputs and outputs of protection functions in IEC 60255 series

[IEC 61850-7-2:2010 + AMD1 IEC 61869-9:2016
[applicable to SV published by MU]
Application for Protection Functions
Detail Qual Definition Invalid Question-able Meaning of DetailQual for received data
Overflow Value beyond the capability of being represented properly Not Used. Always set to FALSE X Prohibited by IEC 61850-7-2: 2010 + AMD1 (Annex D) Not used in IEC 61869-9:2016
May be applicable to other analog information, e.g. phasors (PhV, A)
The protection shall process the input as invalid
Out of range Value beyond a predefined range of values True in case of Clipping
Publication with validity attribute "Questionable"
  X Publication with validity attribute as "Questionable" preferred
The relevant functional standard shall specify how to process the input
Applicable to SV and other analog information, eg. phasors (PhV, A)
Inaccurate The value does not meet the stated accuracy of the source True if signal does not respect the specified accuracy Prohibited IEC 61850-7-2: 2010 + AMD1 (Annex D) X Applicable to any type of received input data
The relevant functional standard shall specify how to process the input
Applicable to SV and other analog information, e.g. phasors (PhV, A)
Badreference Value may not be a correct value due to a reference being out of calibration Not Used. Always set to FALSE   X Publication with as "Questionable" preferred. The relevant functional standard shall specify how to process the input. Not used in IEC 61869-9:2016
May be applicable to other analog information, e.g. phasors (PhV, A)
Oscillatory Signal changes in a defined time twice in the same direction Not Used. Always set to FALSE   X Not Applicable to analog input data (SV, phasors, etc..), only to binary input data
The protection shall process the input as invalid
Failure Indicates that a supervision function has detected an internal or external failure Used for detected errors X Prohibited by IEC 61850-7-2: 2010 + AMD1 (Annex D Applicable to any type of received input data
The protection shall process the input as invalid
Olddata If an update is not made during a specific time interval Not Used. Always set to FALSE Prohibited by IEC 61850-7-2: 2010 + AMD1 (Annex D X Not used in IEC 61869-9:2016
May be applicable to information, e.g. phasors (PhV, A)
The relevant functional standard shall specify how to process the input
Inconsistent Indicates that an evaluation function has detected an inconsistency Not Used. Always set to FALSE Prohibited by IEC 61850-7-2: 2010 + AMD1 (Annex D X Not used in IEC 61869-9:2016
May be applicable to other information, e.g. phasors (PhV, A)
The relevant functional standard shall specify how to process the input