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Reference Number NIA2_NGET0003
Title Retrofitting Oil Source Heat Recovery to Transformers
Status Completed
Energy Categories Other Power and Storage Technologies(Electricity transmission and distribution) 100%;
Research Types Applied Research and Development 100%
Science and Technology Fields ENGINEERING AND TECHNOLOGY (Electrical and Electronic Engineering) 100%
UKERC Cross Cutting Characterisation Not Cross-cutting 100%
Principal Investigator Project Contact
No email address given
National Grid Electricity Transmission
Award Type Network Innovation Allowance
Funding Source Ofgem
Start Date 01 November 2021
End Date 30 October 2022
Duration ENA months
Total Grant Value £220,000
Industrial Sectors Power
Region London
Programme Network Innovation Allowance
Investigators Principal Investigator Project Contact , National Grid Electricity Transmission (100.000%)
  Industrial Collaborator Project Contact , National Grid Electricity Transmission (0.000%)
Web Site
Objectives SSE Energy Solutions has developed a heat recovery design for an SGT at Deeside; the design has been verified by NGET engineers working on the OSEAIT NIC Project (“Deeside”). This design could be used as the basis for a full waste heat recovery system by considering the design and installation for any specific transformer. However, the system has not been tested to confirm the effect it would have on the existing cooling system of a transformer and there is a need to de-risk installing such a system on an operational transmission transformer. This project will therefore result in the installation of the oil-side of an oil-water waste heat exchanger system to demonstrate that there is no negative impact and may therefore deliver anticipated benefits of reduced CO2 emissions in district heat recovery systems. The learning from this project would form part of type registration for future installations of this design at operational substationsData Quality Statement (DQS): The project will be delivered under the NIA framework in line with OFGEM, ENA and NGGT / NGET internal policy. Data produced as part of this project will be subject to quality assurance to ensure that the information produced with each deliverable is accurate to the best of our knowledge and sources of information are appropriately documented. All deliverables and project outputs will be stored on our internal sharepoint platform ensuring access control, backup and version management. Relevant project documentation and reports will also be made available on the ENA Smarter Networks Portal and dissemination material will be shared with the relevant stakeholders.   Measurement Quality Statement (MQS): ​The methodology used in this project will be subject to our suppliers own quality assurance regime. Quality assurance processes and the source of data, measurement processes and equipment as well as data processing will be clearly documented and verifiable. The measurements, designs and economic assessments will also be clearly documented in the relevant deliverables and final project report and will be made available for review. In line with the ENAs ENIP document, the risk rating is scored Low.TRL Steps = 1 (2 TRL steps)Cost = 1 (£220k)Suppliers = 1 (1 supplier)Data Assumption = 1 (data supplied by suppliers for analysis) The scope of the project will be to procure, install and test the oil side of a waste heat exchanger system on a transformer that will be out of service for the duration of the project but that has previously been operational, it will also be returned to service as it is part of the infrastructure for the Deeside Centre for Innovation. Development of the control system will be part of this project, it is necessary to demonstrate that the transformer will continue to be effectively and efficiently cooled and there is no risk to increased ageing as a result of fitting the waste heat exchanger. The control system will be linked to the transformer controls, but temperatures will be simulated within the control system during testing.Heat exchangers are tried and tested technology and the transformer will not be energised so no heat will be exchanged and the water side of the system will not be installed.The viability of this system in practice on an operational transformer and whether the low-grade heat from a transmission transformer is sufficient for use in a district heating scheme has already been considered before developing this project. The objectives of this project are to install and commission a power transformer oil heat extraction system and to successfully validate and test an oil heat extraction system against the trial criteria.Upon completion of the trial, the system will be decommissioned and removed.
Abstract A partial heat exchanger system (oil side) will be installed on a de-energised transformer at the Deeside Centre for Innovation to demonstrate that such a system can be retrofitted to in-service transformers without compromising the transformers cooling system and thereby affect its normal operation. The trial will determine how to install the system in such a way that both the transformer and the heat exchanger system may be accessed and maintained safely. A control system will be developed for testing purposes and integrated with existing controls.The benefit of this project will be to demonstrate that waste heat generated from transformers can be used to support district heat networks close to transmission substations and reduce emissions of carbon dioxide that would otherwise be emitted in producing the necessary heat.
Publications (none)
Final Report (none)
Added to Database 02/11/22