CIM Issues » WG14 Issues

In a WG13 discussion April 20,2022 (from a WG13 perspective):
Tom McDermott approves of the proposed changes.
Svein Olsen shared this is being addressed in part in the Energy Modeling Requirements subgroup. He also shared: UsagePoint is already an overloaded term and it would be better to create another class.

Discussed 19-Sep-2022 UCA WG13/WG14/WG16 CIM Model Managers – Joint UML Issues Session

A lot of the discussion was related to understanding the purpose and applications of UsagePoint.

Proposal summary: use similar associations for UsagePoint as for Measurement
#1: Add optional association [0..1] to Terminal
#2: Make association with Equipment more general Replace UsagePoint -> Equipment with UsagePoint -> PowerSystemResource
#3 Improve descriptive text of UsagePoint and refer to IEC 60050 (IEV) definitions https://www.electropedia.org/

decisions
#1 agreed
#2 agreed
#3 agreed in principle - Tom Berry to provide a draft

Existing description
Logical or physical point in the network to which readings or events may be attributed. Used at the place where a physical or virtual meter may be located; however, it is not required that a meter be present.

Proposed description
Logical or physical point in the network to which measurements, meter readings or events may be attributed. It is not required that a meter or measuring device exists physically or in the model.

UsagePoint and its associated Terminal correspond to a Point of Connection (POC) "reference point on the electric power system where the user’s electrical facility is connected" [IEV 617-04-01], also known as Point of Common Coupling (PCC) "electrical point in an electric power system, electrically nearest to a particular load or generator, at which other loads or generators are, or may be, connected" [IEC 61850-7-420, IEV 614-01-12 modified to add generator]

Scott and Jay think that the UsagePoint should be mapped to the PCC and not the POC. In general, there will be no modelling behind the meter, so technically yes each POC maps to the same PCC, but PCC is the better term to use for the definition.