{"id":1060,"date":"2021-10-15T16:22:46","date_gmt":"2021-10-15T15:22:46","guid":{"rendered":"http:\/\/vtesrenewables.com\/?post_type=case_studies&p=1060"},"modified":"2022-02-04T14:16:01","modified_gmt":"2022-02-04T14:16:01","slug":"tdr","status":"publish","type":"case_studies","link":"https:\/\/vtesrenewables.com\/case-studies\/tdr\/","title":{"rendered":"TDR"},"content":{"rendered":"\n\n\t
\n\t\t\t\tCASE STUDY\n\t\t\t<\/h5>\n\t

\n\t\t\t\tTDR\n\t\t\t<\/h1>\n\t

\n\t\t\t\tOVERVIEW\n\t\t\t<\/h5>\n\t

\n\t\t\t\tV-TES was approached by a major North Sea Oil & Gas operator following a cable fault being suspected on the 11kV subsea incomer\/interconnector cabling between two offshore platforms.\n\t\t\t<\/h2>\n\t

The requirement was to carry out Time Domain Reflectometer (TDR) testing of the 11kV feeder cable between platforms after a failure during operation. The length of the subsea cable was believed to be approximately 5.1km, which was discussed and confirmed by the platform electrical technicians.<\/p>\n

Testing was to be carried out at both platforms to build up a clear picture of the precise location of the failure within the cable.<\/p>\n\t

At short notice, V-TES deployed an Engineer, all required testing equipment and software to go to the offshore locations in order of completing TDR & IR testing on the 11kV \/ 5km subsea cable.<\/p>\n

Multiple meetings were held between V-TES and other project teams, including the Global Marine Group and cable manufacturers to make sure that the best solution was being offered for repairing or replacing the 11kV cables (HV and with Fibre Optic included).<\/p>\n

It was decided the best route forward was to replace the cabling due to there being water ingress detected.<\/p>\n

V-TES sister company, AISUS, carried out work to clean the J tubes, burst the diaphragms and run-in messenger lines to allow the ease of access for the new Subsea cables coming from the seabed and up to the platform.<\/p>\n

V-TES mobilised the HV jointing & fibre optic team to work between the offshore locations. This included preparation works to the connection cubicles, cable containment, checking & marking up drawings and making sure all was in place to accommodate the newHV and FO cables\/terminations.<\/p>\n

The Engineers moved from platform to platform, and rolled from days to nights and back to days to work around platform operations, all whilst working closely with the cable-laying vessel Normand Cutter of Global Marine Group.<\/p>\n

\n\t\tREQUIREMENTS\n\t<\/h5>\n\tThe requirement was to replace, terminate, test and
\ncommission the main 11kV interconnector HV subsea
\nand fibre optic cabling between two offshore oil and
\ngas platforms in a time-critical window.\n
\n\t\tCHALLENGES\n\t<\/h5>\n
\n\t\tAPPROACH\n\t<\/h5>\n\t

To arrive at the best course of action and solution, multiple planning and preparation meetings were held. This ensured that all options were considered and the best approach was taken as soon as the cable fault was sourced.<\/p>\n\t