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The action you need to take for Loss of Mains Settings

16 December, 2019
Energy Networks Association have brought forward plans to force all installations to change their Loss of Mains (LoM) settings following a recent national power outage that caused travel chaos.

ALoMCP Important Information

Generation owners are required, by the Distribution Code, to install Loss of Mains (LoM) protection at their distributed generation sites. This is to ensure that distributed generation does not form an autonomous power island with the remaining local demand. Other faults elsewhere on the GB electricity system should not result in the operation of LoM protection.

In most cases, LoM protection is provided by means of a protection relay. However, some sites may have LoM functionality built in within the generation control system, e.g. within individual inverters.

It was identified that loss of mains protection with these settings could inadvertently operate and trip your site, following events that do not result in islanding. Not only would this result in some loss of revenue at each site that has been unnecessarily disconnected from the system, but also the total generation loss at multiple sites. This could cause a significant system disturbance and a widespread loss of supply.

What do generation owners have to do?

It is a generation owner’s responsibility to comply with the Distribution Code in order to fulfil the terms under which you connect to the distribution network. Therefore, you are required to review and make any changes to your LoM protection settings by the end of August 2022, as specified in the latest Distribution Code.

Some generation types, particularly (but not exclusively) inverters, will include LoM functionality in the control equipment. These settings must be made to comply with the new requirements, as well as any relay protection that might be on the site.

What do generation owners have to do?

It is a generation owner’s responsibility to comply with the Distribution Code in order to fulfil the terms under which you connect to the distribution network. Therefore, you are required to review and make any changes to your LoM protection settings by the end of August 2022, as specified in the latest Distribution Code.

Some generation types, particularly (but not exclusively) inverters, will include LoM functionality in the control equipment. These settings must be made to comply with the new requirements, as well as any relay protection that might be on the site.
In some cases, a site might comprise multiple inverters. In such cases, all inverters must be modified if this is necessary to conform to the new requirements. If these protection devices cannot be reset appropriately and are used to provide LoM protection for other types of generation, they must have the LoM function disabled.

The ALoMCP programme does not cover any replacement to an inverter itself, as the work will need to be done through changing the logic of their control system (either resetting them or disabling the LoM function).

If resetting the logic of the control system is not possible, the implications will need to be discussed with the DNO and may result in adding a mains protection relay to the system. Power Different will discuss this with the DNO and quote after the site evaluation & DNO consultation.

Owners of generation have a requirement to comply with the modified interface protection requirements in the revised EREC G59 and have until 31 August 2022 to do so. After that date owners who have not made the change may be the subject of an enforcement programme.

Funding available

Funding is available to support generation owners in making necessary changes. Early action from generation owners to achieve compliance will result in the best chances in obtaining funding. Power Different will facilitate this on your behalf. These changes are mandatory and funding is limited.

Please contact AF Commercial Services directly to discuss what is required and the costs of the works.

Get in touch

Contact us

If you have any queries or would like to find out more please get in touch.
info@theafgroup.co.uk 01603 881881Honingham Thorpe, Colton, Norwich, Norfolk NR9 5BZ
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