IEEE Power & Energy Magazine - January/February 2016 - 75

implementations requiring it, from local cIm extensions.
By design, the cIm profiling practice allows the same information to be exchanged in multiple technologies, although
in practice this does not typically occur. It is common for
profiles to make references to cIm data exchanged in different technologies so the best technology choice can be made
for each business exchange.

End Device Profile
EndDevice
+ serialNumber : String
+ type : String
+ amrSystem : String
+ installCode : String
+ isPan : Boolean
EndDevices
1..*

Payload Serialization Level
Previous sections have addressed the canonical cIm and
profile derivation from it by means of restrictions. This section addresses the syntactic aspects of profiles and considerations for selecting a syntax. at present, standard cIm
profiles get translated into one of two distinct flavors, both
based on w3c Xml syntax, as graphically illustrated in
figure 7(a) for rDfs and (b) for XsD.
The very first cIm payload type was defined in 1999 using
w3c rDfs, and the payload instance data was thus serialized as a special dialect of Xml, called rDf. The rDfs representation of a profile has been defined in Iec 61970-501,
and the instance data format, or the payload serialization
format compliant to that schema, has been called cImXml
and defined in Iec 61970-552. The subset of rDfs used for
some cIm profiles has been defined in such a way that the

UsagePoint
1
UsagePoint
+ mRID : String
+ phaseCode : PhaseCode
+ ratedPower : ActrivePower

UsagePointLocation
0..1

UsagePoints
Equipments
0..*
1
EnergyConsumer
+ mRID : String
+ customerCount : Integer
+ grounded : Boolean
+ p : ActivePower
+ q : ActivePower

figure 6. An end-device profile example.

table 1. IEC 61970 standards.
Type of Standard

IEC 61970 Standards for Transmission

Description

CIM canonical model

IEC 61970-301

Base power system model.

CIM canonical model

IEC 61970-302

Base dynamics model.

Profile standards

IEC 61970-4xx profile (the CPSM profiles
are in IEC 61970-452 and IEC 61970-456)

One or more companion standards that define a profile
based on a use case.

IT schema

IEC 61970-501

W3C RDF reduced schema describes how the RDF
reduced schema is produced and used.

Instance data

IEC 61970-552

W3C RDF XML as described by RDFS describes how the
RDF XML is produced. This is also known as the payload.

table 2. IEC 61968 standards.
Type of Standard

IEC 61968 Standards for Distribution and
System Integration

Description

CIM canonical model

IEC 61968-11

Base distribution operations model.

Profile standards

IEC 61968-3 through IEC 61968-14 (the
metering and control profile standard is IEC
61968-9 and the CDPSM profiles are in IEC
61968-13, IEC 61970-456, and IEC 61968-4)

One or more companion standards that define a
set of messaging profiles based on an operational
system and its use cases.

IT schema

W3C XSD
IEC 62361-100
IEC 61968-100

The W3C XSD standard describes how the XSD is
produced and used.
The IEC62361-100 companion standard describes
the XSD to XML mapping that is required for the
CIMXML message payload.
The IEC 61968-100 companion standard describes
the message envelope that contains the header and
payload.

Instance data

W3C XML

The W3C XML standard describes the XML format.

january/february 2016

ieee power & energy magazine

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - January/February 2016