1240   Normal qubic meter per hour

This tissue has following status: green

Created: 14 Apr 2014

Links:

Page: 77

Clause: Annex A

Paragraph:

Category: Issue for edition 2 of this part

Issue: For providing values of measured flow of gas we need to specify the unit of a normal qubic meter per hour (per second will also do)

Proposal: Please add a SI-unit enumeration for Nm3/h (or Nm3/s)

Discussion Created Status
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Ballot until Editor
ballot date expired 08 Jun 15 green
Further clarification is required concerning the issue we want to solve.

First of all, normalized qubic meter are not standardized or there exists at least multiple Standards with different values (e.g. DIN 1343 or ISO 2533).

Secondly, I would assume that the semantic of a data object might declare the conditions under which a measured flow of gas is specified.

Proposal:
Do not use a new unit; however, specify within the data model the conditions (temperature / pressure / humidity) to which the measurement shall be normalized
24 Apr 15 final proposal 24.5.2015
prefer to use only m3/s and precise the normal condition of temperature and pressure at the DataObject semantic level.
This would lead to an interop issue to monitor the SIUnit to realize if normal condition of temperature and pressure
else if current condition of temperature and pressure.
05 Mar 15 red
Please use only m3/s since this is the SI unit. 23 Jun 14 white
In the DCIM metering and CIM measurement domains, we made it to harmonise all the codes for unit symbols to fit those in 61850-7-3 (if there is overlap).

If this request gets approved, please use the following definition (to preserve 1:1 correspondence with 61970/61968):

- string value, as for SCL: m3/h (3 is exponent, similar to other exponents)
- description: Volumetric flow rate, cubic metre per hour
- value / code: 125.
14 Apr 14 white

 

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