go to top scroll for more


Projects: Projects for Investigator
Reference Number NIA_NGET0018
Title Potentials and profiles around earth electrodes and opposite-side injection for large-area earthing
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 January 2012
End Date 01 April 2014
Duration 27 months
Total Grant Value £300,000
Industrial Sectors Power
Region London
Programme Network Innovation Allowance
Investigators Principal Investigator Project Contact , National Grid Electricity Transmission (100.000%)
Web Site http://www.smarternetworks.org/project/NIA_NGET0018
Objectives The objectives for this project are as follows; To evaluate the current simulation approaches against site experimental results (at both Dinorwig power station and Cardiff University test sites) in determining the extension of substation hot-zones To investigate the scalability of low-current injection testing To investigate the non-linear effects, including current and frequency dependency, of earth impedance. This project will be successful if we can understand in greater detail the issues faced around earth electrodes.
Abstract The impact of rise of earth on the safety of staff, contractors and the general public has been identified as needing research to develop relevant knowledge. The following sets out the issues that need to be researched: The accuracy of site measurements has been unsatisfactory hence a novel testing scheme is to be developed. The current computer simulation approach has not been validated rigorously with site measurements. Earthing impedance shows dependency on frequency, this is not being taken into account in analytic approaches. Measurements are always carried out with low current injection. However, pilot experiments showed the non-linearity between earthing impedance and injected current. The methods that will be used to investigate and solve this problem are; - Purchase and set up of generator power supply-Llanrumney;- Set up laboratory tests, test cell and samples preparation- Llanrumney and laboratory tests - scalability, current and frequently effects (I)- Dinorwig test site - set up of high current test facility- Dinorwig tests - interim results on scalability, current and frequency effects- Preliminary models and equivalent circuits- Preliminary report on scalability and non-linear effects- Llanrumney and Dinorwig- Exported potentials and potential fall off tests- Llanrumney and laboratory tests - scalability, current and frequency effects- Llanrumney and Dinorwig- Opposite side injection tests- Llanrumney and Dinorwig- Exported potentials and potential fall off tests- Presentation of findings- Final ReportNote : Project Documents may be available via the ENA Smarter Networks Portal using the Website link above
Publications (none)
Final Report (none)
Added to Database 17/09/18