Projects: Projects for Investigator
|Title||Development of Oil-filled Cable Additive|
|Energy Categories||Other Power and Storage Technologies(Electricity transmission and distribution) 100%;|
|Research Types||Applied Research and Development 100%|
|Science and Technology Fields||PHYSICAL SCIENCES AND MATHEMATICS (Chemistry) 25%;
PHYSICAL SCIENCES AND MATHEMATICS (Metallurgy and Materials) 25%;
ENGINEERING AND TECHNOLOGY (Electrical and Electronic Engineering) 25%;
ENGINEERING AND TECHNOLOGY (Mechanical, Aeronautical and Manufacturing Engineering) 25%;
|UKERC Cross Cutting Characterisation||Not Cross-cutting 100%|
No email address given
|Award Type||Network Innovation Allowance|
|Start Date||01 March 2016|
|End Date||01 June 2017|
|Total Grant Value||£180,000|
|Region||Yorkshire & Humberside|
|Programme||Network Innovation Allowance|
|Investigators||Principal Investigator||Project Contact , Northern Powergrid (99.999%)|
|Other Investigator|| Project Contact , UK Power Networks (0.001%)
The success for this low TRL project is the delivery of the objectives detailed above and a confirmed decision as to whether to continue the project into a further development phase as a separate follow-up activity.
|Abstract||All major GB electricity utilities have fluid filled cable circuits on their distribution networks. These are mostly of the low pressure fluid filled type, typically designed to operate at 3 - 5 bar pressure with short term peaking pressures up to 8 bar. Over time these cables may begin to leak cable fluid and subsequently the cable pressure may drop and the cable insulation system (fluid impregnated paper or paper-polypropylene laminate) may eventually fail. In some cases the leaks may also cause environmental contamination that is of concern to the network operator, to the public and importantly the Environment Agency who could enforce the closure of cable circuits or impose limits on their operation.
The causes of leaks can be categorised as follows:
Further reduced reliability has been associated with:
These aspects have resulted in an uncertain outlook for the future reliability of fluid filled cables. However there are still many of these circuits in operation, and the challenge remains to improve the condition and reliability of existing cable circuits, to reduce failures and outages, and to significantly reduce the associated liability costs of outage and environmental pollution. There is an urgent and on-going need in the GB electricity distribution network to prevent and treat cable fluid leaks to improve the reliability of fluid filled cables and to reduce environmental damage that often accompanies oil leakage. However, it is important that the methods used to achieve this fit into a low-maintenance strategy and where possible are self-managing without the need for detection, location-finding and manual repair. For land based cables deployed underground in backfill, in cable trough installations or deployed in cable ways in tunnels and other civil constructions, damage may occur at the time of installation and also during operation when third parties carry out civil repairs. Damage may also occur through cable ageing and stressing. Once cable leakages have been detected,locating the sourceof the leak is a difficult process. In-situ cable self-repair is seen as invaluable as damage may be localised and non-obvious from inspection of the cable during operation and may appear many years after installation. In many cases it may not be possible to inspect the cable in inaccessible environments. The project seeks to address this challenge by utilising new developments in self-repairing polymers, resins and reactive chemical technologies for fluid systems that are potentially capable of providing a repair function for a variety of cable sheath defects and damage types that may occur. The uniqueness relates to the use of the fluid medium to affect the repair when key reactions are triggered by the presence of a leak and exposure of the fluid to the ambient conditions around the cable. This project is being undertaken in a series of self-contained stages. The first three of these have already been completed under IFI. The method as a whole has to be taken in the context of this previous work which is described below to provide that context.
Stage 1 - Completed under the IFI Critical review and selection of potential repair technologies with account of the damages/ leaks to be repaired, and the sourcing of the component compounds and design of test rigs - to include consultations with EDF R&D.
Stage 2 - Completed under the IFI First level scoping assessment of synthesised and formulated self-repair technologies to assess their ability to function in cable-like environments when subjected to damage and use these findings to select candidates for more detailed evaluation.
Stage 3 - Completed under the IFI Second level evaluation of the best candidate repair technologies from Stage 2 with recommendations on which technologies to move to cable testing in stage 4.
Stage 4 - This project :
Note : Project Documents may be available via the ENA Smarter Networks Portal using the Website link above
|Added to Database||09/08/18|