5.1 - 5.3

Current Transformers

The SMETS do not cover Current Transformer metering. The CoP10 requirements will apply.

5.4.1

Displays

Although the SMETS Meter records Import kvarh and Export kvarh, there is no requirement to display these.

Other display capabilities that the SMETS do not include are Maximum Demand (MD) kVA, Cumulative MD and number of MD resets. However, these are optional requirements, ‘as specified by the Registrant’. It is unlikely that Suppliers will require these features for the significant majority of domestic and small non-domestic sub-100kW Metering Systems.

5.5

Protocol Approval

Meters that are SMETS compliant do not require approval under BSCP601 ‘Metering Protocol Approval and Compliance Testing’.

5.5

Time Synchronisation

The responsibility will move from the HHDC to the Supplier/DCC and is part of the protocol approval process.

5.5

Separately fused supply for modems

There are requirements in the SMETS about the supply to Communications Hubs.

5.5.1

Data Storage

There are no SMETS equivalents to the requirements that –

• ‘the resolution of the Active Energy transferred into the demand registers shall be within ±0.1% (at full load) of the amount of Active Energy measured by the associated Meter’;

• energy measured in a Demand Period but not stored in that Demand Period should be carried forward to the next Demand Period;

• the clock and calendar can function for 20 days without an external supply.

5.5.2

Time Keeping

There are no SMETS requirements to maintain time keeping accuracy allowing for failures to communicate of 20 days.

5.5.3

Monitoring / Alarms

There are no SMETS requirements for –

• battery monitoring

• Demand Periods truncated or extended by a time synchronisation;

• Metering equipment functionality errors.

Intellectual Property Rights, Copyright and Disclaimer

The copyright and other intellectual property rights in this document are vested in ELEXON or appear with the consent of the copyright owner. These materials are made available for you for the purposes of your participation in the electricity industry. If you have an interest in the electricity industry, you may view, download, copy, distribute, modify, transmit, publish, sell or create derivative works (in whatever format) from this document or in other cases use for personal academic or other non-commercial purposes. All copyright and other proprietary notices contained in the document must be retained on any copy you make.

All other rights of the copyright owner not expressly dealt with above are reserved.

No representation, warranty or guarantee is made that the information in this document is accurate or complete. While care is taken in the collection and provision of this information, ELEXON Limited shall not be liable for any errors, omissions, misstatements or mistakes in any information or damages resulting from the use of this information or action taken in reliance on it.