Wednesday, May 15, 2013

Another draft standard that “copies” IEC 61850 Logical Nodes

ISO/TC 205/WG 3 (Building Automation and Control System (BACS) Design) has published recently a new work proposal on power system information models [ISO/TC 205 / SC N 410].

Title: Facility Smart Grid Information Model

Purpose and justification of the proposal:
”The purpose of this standard is to define an abstract, object-oriented information model to enable appliances and control systems in homes, buildings, and industrial facilities to manage electrical loads and generation sources in response to communication with a “smart” electrical grid and to communicate information about those electrical loads to utility and other electrical service providers.

This proposed standard will define an information model intended to provide a basis for revision or creation of technology- specific communication protocol standards that enable products and services to control the operation of electrical energy generating and consuming devices found in homes, commercial buildings, institutional buildings, and in manufacturing and industrial facilities, in cooperation with energy providers in a "smart grid" environment.”

The new work item proposal states that “This proposal builds upon work done by IEC/TC 57 Power Systems Management and Associated Information Exchange … There is no known conflict with an existing IEC or ISO standard or project.”

There may be no conflict … the proposal (same as Draft standard BSR/ASHRAE 201P) “copies” Logical Nodes from IEC 61850 and modifies the Data Object names. For example:

Excerpt from Draft standard BSR/ASHRAE 201P:

5.7.3.3.1.5. DEROperationalModeControls

Operating mode at the ECP.
Control of the operational modes of the DER – constant watts, constant vars, …More than one mode can be set simultaneously for certain logical combinations (61850
Logical Node = DOPM).
Parent Class(es): CommonLN
UML element location: Model Elements from External Sources.IEC61850.61850-7-420. DEROperationalModeControls.

Table 5.193 - Class Attributes

Data Object Description CDC
OperationalModeConstantW Mode of operation - constant watts. SPC

OperationModeConstantPowerFactor

Mode of operation - constant power factor. SPC
OperationModeConstantV Mode of operation - constant voltage. SPG

Excerpt from Standard IEC 61850-7-420 (LN DOPM):

Data Object Description CDC
OpModConW Mode of operation – constant watts SPC
OpModConPF Mode of operation – constant power factor SPC
OpModConV Mode of operation – constant voltage SPC

So, changing the names from abbreviated names to full text names makes it another standard information model … why? If other groups “copy” the Logical Nodes and Data Objects they should keep the names … Or?

I guess the main reason for this is:

Genesis 11:9 “Therefore, it is named Babel, because there the LORD mixed up the language of all the earth.” … languages spoken by humans and by computers!

1 comment:

Rodney Hughes said...

You are surely joking… ?!?!?
Just making object names a bit longer!!!!
What a waste of time for those on the standardisation committees. This adds no value.
I know a lot of Building Services electrical engineers and they seem to be just as smart as any other electrical engineer.

Seriously! How do make know our individual and collective objections to these pointless tweaks to the existing names of Objects?