Tuesday, November 18, 2014

COSEM Object Model (IEC 62056) carried with IEC 61850 Data Model

IEC TC 57 has just published a very interesting new draft (57/1521/CD):

IEC 61850-80-4 TS:
Communication networks and systems for power utility automation - Part 80-4:
Translation from COSEM object model (IEC 62056) to the IEC 61850 data model

The IEC 61850 is already THE international Standard series when it comes to (electric) power applications and information modeling and exchange. Metering Information is quite often exchanged with DLMS and COSEM:

COSEM (Companion Specification for Energy Metering) is part of the DLMS (Device Language Message Specification)

This information needs to be “fed” into the IEC 61850 world. That is done by defining how the corresponding COSEM information can be wrapped with IEC 61850 Logical Nodes and Data Objects. The title says: Translated … which means the same.

Here is an example:

IEC 61850 Data

COSEM OBIS Code

Explanation

TotVAh

(1-b:9.8.0.255) – (1-b:10.8.0.255)

Net apparent energy

TotWh

1-b:1.8.0.255 - 1-b:2.8.0.255 (¦+A¦ - ¦-A¦)

Net real energy

TotVArh

1-b:3.8.0.255 - 1-b:4.8.0.255 (¦+R¦ - ¦-R¦)

Net reactive energy

SupWh

1-b:1.8.0.255 (+A)

Real energy supply (default supply direction: energy flow towards busbar and is equivalent to Energy Export[+])

SupVArh

1-b:3.8.0.255 (+R)

Reactive energy supply (default supply direction: energy flow towards busbar and is equivalent to Energy Export[+])

DmdWh

1-b:2.8.0.255 (-A)

Real energy demand (default demand direction: energy flow from busbar away and is equivalent to Energy Import[-])

DmdVArh

1-b:4.8.0.255 (-R)

Reactive energy demand (default demand direction: energy flow from busbar away and is equivalent to Energy Import[-])

These IEC 61850 Logical Nodes are of interest for the translation:

MMTR - Metering 3 Phase
MMTN - Metering Single Phase
MMXU - Measurement
MMXN - Non-phase-related measurement
MMDC - DC measurement
MSQI - Sequence and imbalance
MHAN - Non-phase-related harmonics or interharmonics
MHAI - Harmonics or interharmonics
MFLK - Flicker measurement

Closing date for comments: 2015-02-20

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