Elstree to St. John's Wood Cable Tunnel
The Elstree to St. John's Wood Cable Tunnel, known as The London Connection during construction, is a 20km long, 3m wide tunnel beneath northwest London. Constructed between 2001 and 2005, the tunnel carries high voltage transmission lines from Elstree substation in Hertfordshire to St. John's Wood substation in Westminster at a depth of 20m below street level.[1]
| Elstree to St. John's Wood Cable Tunnel | |
|---|---|
| Location | |
| Country | UK |
| Province | Greater London |
| Ownership information | |
| Owner | National Grid plc |
| Construction information | |
| Construction started | 2001 |
| Commissioned | 2005 |
| Technical information | |
| Type | Underground tunnel |
| Type of current | AC |
| Total length | 20 km (12 mi) |
| AC voltage | 400 kV |
The tunnel runs beneath the A5 road for the majority of its length, and houses a single 400 kV power transmission circuit with a rated capacity of 3700 A. There is provision for a second circuit to be installed in the future.[2]
A remotely operated, battery powered monorail system runs along the tunnel, allowing the cables to be inspected remotely using infrared cameras.[3]
Route of Elstree to St John's Wood cable tunnel
References
- "ABB starts to make 'The London Connection'" (Press release). 25 October 2004. Retrieved 13 January 2020.
- "London extension uses biggest ever XLPE cable". Modern Power Systems. 20 April 2001. Retrieved 13 January 2020.
- "The private monorail tunnel under North London". Ian Visits. 12 October 2016. Retrieved 13 January 2020.
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