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RJ Power Group Maintain Progress on HV Feeder F623

As part of a package of three HV Feeders, RJ Power Group’s rail division is on course to complete its third and final HV feeder (F623) for its client BCM. Having already successfully commissioned two new HV feeders back to back in November 2016, the specialist rail electrical contractor is working towards commissioning this final feeder into service during Week 44 to complete the contract.

The existing HV Feeder 623 is an oil-fed cable that runs between Catford and Shortlands substations, with a TP Hut in between at Beckenham Hill station.

RJ Power Group is replacing this existing oil feeder with a new 300mm copper XLPE HV cable, running from Catford Substation to Shortlands Substation.

The length of the feeder, which is some 4,444 yards long, necessitates the need to joint the HV and pilot cables to link the whole installation between the two substations.

RJ Power Group is also replacing the 28-core pilot cable with a new 20-pair pilot cable which runs from Catford Substation to Bellingham DC modular building – into Beckenham Hill TP Hut and then into Shortlands Substation. RJ Power Group has installed new pilot boxes in each of these buildings along the route. The new 20 pair pilot cable has been terminated into the boxes at each site. The pilot cable has been jointed together in locations along the route and will be tested for continuity and insulation resistance ahead of the pilot cable being brought into service by our Testing & Commissioning team.

Before RJ Power Group can joint the HV cables, they will be sheath tested to Network Rail Standards to detect any damage done. Once sheath testing has successfully been conducted, RJ Power Group’s engineers will join the HV cables together with a 3m inline joint – there are 21 of them on this feeder. The pilot cable will also be jointed by way of 20-pair pilot joints. Once the pilot cable has been jointed, RJ Power Group will finally test the pilot cable from the newly installed pilot boxes, to prove that the pilot joints are not faulty and the communication through the pilot cable will work once brought into service. The pilot joints will be resin-filled once all testing has passed, with a compound that seals them to keep moisture out.

Final pressure testing at 76kV will be undertaken on the HV cable, from end to end, once all the HV joints have been installed. This is done to test the HV joints prior to connecting to the switch gear in the substations.

The major commissioning weekend is at the end of week 44, with the first possession for recovery of the redundant oil-fed cable on the weekend of week 46. In advance of the commissioning, all works described must be completed and a Form E signed off by the Contractors Responsible Engineer and the Network Rail Project Engineer to confirm all installation works have been completed to the design.


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