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Accelerated loss of mains (LoM) change programme

Accelerated loss of mains change programme

As part of the UK's energy transition, all owners of generating sites in Great Britain are required to ensure that their protection settings are compliant with Engineering Recommendation G59/3-7.

 

Introduction

The Accelerated Loss of Mains (LoM) Change Programme allowed generator owners to apply for funding to make the necessary changes to their protection to ensure compliance against an update to the Distribution Code, which specifies that the current protection settings required for any new generation connecting to the network must now also be applied to all existing generation with loss of mains protection by September 2022.

 

 

Benefits

Upgrading your Loss of Mains protection now will make your equipment more efficient, help to avoid unnecessary disruption to our customers, and support a net zero carbon electricity grid by allowing more low carbon power to flow at a lower cost.

Deadline for compliance

Although the opportunity to apply for funding has now closed, we still need to hear from you if your equipment is already compliant.

Any generators that are not compliant by the deadline of 31st August 2022 may be subject to enforcement procedures which could ultimately result in de-energisation.

How to comply with the changes

  • Where rate of change of frequency (RoCoF) protection relays are used, as part of Loss of Mains protection, the applied setting should be 1Hzs-1 with a definite time delay of 500ms.
  • Vector shift protection technique should be removed where it is in use as Loss of Mains protection.
  • Any existing over-frequency setting relays still set at 50.5Hz should if possible be reset to 52.0Hz.

 

 

                                                           Our programme statistics

LoM dashboard March 2022.JPG

                     Percentage of generators on our network with updated protection

                        LoM graph March 2022..JPG

Useful links

Programme update reports and event slides

View programme update reports and slides from previously held Accelerated Loss of Mains Change Programme events.

Find out more

Get in touch

If you have any queries relating to the programme please get in touch with our team.

Contact us

Is your site already compliant?

Please confirm by submitting a compliance declaration form.

Confirm compliance

Recognised contractors

Find out how to become a recognised contractor or how to find one to make the changes to your Loss of Mains protection.

Read more