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RJ Power Networks Completes Installation of New HV and LV Equipment

RJ Power Networks has completed the removal of old and outdated and installation of new modern HV and LV equipment. This project was carried out in partnership and collaboration with One Facility Ltd, who are the embedded Total Facilities Maintenance provider to the UK division of the largest European developer and manufacturer of missiles and complex weapon systems.

The Networks team were responsible for the procurement of the newly proposed apparatus, the procurement of the plant movement specialists and the instruction of a copper specialist to design a bespoke LV Busbar system that had to be in-situ with the new equipment being installed.

The project was to replace 1x SF6 Alstom RT Ring Main Unit with TLF circuit breaker protection and 1x 800Kva Trasfor cast resin transformer. RJ Power Networks proposed modern equivalent replacements for our client, replacing the outdated equipment with; 1x Schneider RN2C-T2/21 Ring Main Unit, with Vip300 circuit breaker protection and 1x Schneider ECO Design Trihal 800Kva cast resin transformer.

There were a few challenges when completing this job, including the logistics of getting the old equipment out of the substation and the new equipment in, due to the substation only being accessible from the rear of the building via a footpath with a severe decline. The plant movement specialist advised that it would be extremely difficult and time consuming to winch the apparatus in a controlled manner down to the substation entrance. The building was also surrounded by a highly maintained garden, which is also viewable by the public, so the use of a Hiab to aid the movement of the plant apparatus was also considered unviable. So, the Networks team and the plant movement specialist worked together to come to a final lifting proposal, which was to crane the apparatus over the substation building onto a false platform, which was built to the same height as the substation floor elevation, in order to enable a smooth transition.

Another challenge the Networks team faced, was the procurement of a Schneider Trihal Transformer, which had to have the correct dimensions in order to be able to install it into the existing transformer housing. However, the new Eco design of the Schneider Trihal transformer, means that they are manufactured slightly taller and wider than the older generation of cast resin transformers. The alteration in the Transformer size as well as the lack of O&Ms with adequate measurements, prevented the Networks team from fabricating the busbar in advance of the installation date. In order to facilitate the works, we had to instruct our supply chain partner – ICW Powermode – to be in attendance during our installation works and to carry out the fabrication of the bespoke LV busbar system to connect on to the existing local LV panel board. The copper works had to be done on the day of the installation, in order to minimise the client’s electrical downtime onsite.

We received the following praise for our work:

‘This entire complex and extremely technical project was undertaken with precise programming and faultless attention to detail culminating with absolutely zero manufacturing downtime for our client. RJ Power Networks consistently demonstrate their professional approach to providing logistical and technical solutions that add network performance resilience and we are proud to maintain our working partnership.’ – Simon O’Shea

Well done to the Networks Team. The whole project was a success, challenges were met in a timely manner, allowing the completion of the project ahead of the planned working schedule.

The RJ Power Networks team are a highly skilled team, who are able to complete a range of installation and maintenance work on HV and LV equipment.

For all enquiries please contact:


Telephone 01959 546218


Polhill Business Centre, Retreat House London Road, Polhill, Halstead, Kent, TN14 7AA


Registered address
Power House,
London Road,
Kent, TN14 7AA
0345 034 1480
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