Accelerated Loss of Mains Change Programme

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Regulation changes

Generation owners are required by the Distribution Code to install loss of mains (LoM) protection at distributed generation sites. 

This is to ensure that, following a fault that isolates sections of the distribution system to which they are connected from the rest of the electricity system, distributed generation does not form an autonomous power island with the remaining local demand.

Generators associated with the system after February 2018 that as of now use G59 should be upgraded to G99. 

The explanation behind this update is due to the Loss Of Mains protection for existing Renewable Energy Generators. One of the fundamental advantages of this is to decrease the amount of tripping by relaxing the RoCoF limits.



How it Works 

1. Fill in the contact form

We will contact you as soon as possible to discuss your current renewable installations.

2. Send us a copy of your witness test report

If we are able to help, we will request your witness test report to enable check your eligibility. 

3. Our engineers perform the upgrade

We will arrange a time to perform the upgrade. An engineer will visit your site and perform the necessary changes.

4. Free upgrade

We won’t charge you anything — the application, works, and verification will be free of charge!


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