66kV 3 Core Glovers Gas (HP) Cable Joint
Published 06 Mar 2018
- Application: 66kV Cable Joint High Voltage
- Cable Joint Type: 66kV 3 Core Glovers Gas (HP) Cable Joint
- Contributor: Matthew Taffs EHV Cable Jointer & Director at CRS (Cable Repair Services) Ltd
- Featured Manufacturer: Glovers (W T Glover)
- Client: SSE
- Sector: Utility
66kV Cables
Gas Filled High Voltage Cable Jointing
The 66kV 3 core high pressure (200 psi) gas joint (nitrogen) was made for SSE by Matthew Taffs of CRS Ltd and John Beck both working for Balfour Beatty at the time.
The 66kV cable construction was oval copper conductor with a lead sheath and steel reinforcing tapes with hessian wrapped layer. The manufacturer of the cable joint was Glovers (W T Glover) of Trafford Park, Manchester which later became part of BICC.
The cable joint is from the 1950’s and when the joint was unpacked from the wooden create it was still packed in straw. The insulation of the cable had to be stepped down to the conductor known as pencilling using piano wire and weights.
The joint consisted of a two piece split ferrules which was sweated on the conductor with tinmans metal. Once sweated the ferrule was cleaned up and the insulation was ready to be applied. The insulation was flat/plain paper tapes (not crepe) coated in a thin layer of grease and was applied with care by the jointer. Once built up to the final diameter the end profiles had to be skilfully teared down using piano wire and weights again. The metallic screen reinstated from one side to the other and then each core is covered in terylene tape.
Both end cable glands of the joint had internal plumbs /wipes and when the plumbing was finished – hot oil was poured on followed by a hot metal into the cable gland to reinforce the steel tapes and lead sheath as this 66kV cabling system is such high pressure it would split the lead sheath.
Once the 66kV joint was finished the jointer bolted the sleeve to the cable gland and turn on the nitrogen gas and check for leaks. The 66kV joint could be protected in either a Glo (Glovers) Sleeve filled with compound/ bitumen or heat shrink. The job was project managed by Gary Horne, now of CRS (Cable Repair Services) Ltd.
66kV 3 Core Glovers Gas (HP) Cable Joint
66kV Polymeric Cables
21st century cable manufacturing is dominated by polymeric type insulated cables and for offshore wind farm power generation including subsea power, array, inter-array and intra-array cables – to support this type of 66kV high voltage cable infrastructure Thorne & Derrick via their distribution agreement with Nexans can supply a complete range of joints, terminations, connectors and surge arresters detailed below.
Ad: Two Times More Power. Jointers! Empower your CV and skill-set by grasping the 66kV Jointer Training opportunity. Jointers must currently be 33kV Competent and experienced to be ready to undertake the step-up to 66kV from 33kV.
Pictured: Prysmian type tested a 3-core 66kV EPR insulated “wet-design” cable system with aluminium conductor (copper is also available) – and integrated optical element. The solution includes factory, field cable joints, plug-in cable terminations and cable cleats, using proprietary Prysmian Click-Fit™ technology combinings the use of EPR insulation.
66kV Cables – Offshore Wind Farms
Company History – Walter T. Glover & Co
Walter T. Glover & Co of Trafford Park, Manchester and London, were electrical cable manufacturers.
1868 – Company founded with premises at the Bridgewater Street Iron Works in Salford. The founder, Walter T. Glover, was a commercial machinery agent for the Lancashire cotton industry.
1959 – BICC acquired 50% of Submarine Cables Ltd which was used to manufacture and install power cables. Glover’s submarine cables were used to link England and France, and the north and south islands of New Zealand. However, although the company appeared to be doing well, there was increasing international competition to supply cables. The south side of the Trafford Parks works was integrated into the newly formed Wiring and General Cables Division of British Insulated Cables (BICC).
Trip down memory lane…………….
W.T. Glover, Trafford Park, cable being laid over a cofferdam, 1911
W.T. Glover, Trafford Park, Installation of cabling in Ebbw Vale, 1905
W.T. Glover, Trafford Park, installation of cabling, with motor vehicle clearly visible, 1905
W. T. Glover and Co – 1970 The Trafford Park factory was closed, but the Glover brand continued as part of BICC.
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