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Projects: Projects for Investigator
Reference Number	NIA_SPEN_0035
Title	Transient Recovery Voltage Investigation
Status	Completed
Energy Categories	Other Cross-Cutting Technologies or Research(Energy Models) 10%; Other Power and Storage Technologies(Electricity transmission and distribution) 90%;
Research Types	Applied Research and Development 100%
Science and Technology Fields	ENGINEERING AND TECHNOLOGY (Electrical and Electronic Engineering) 100%
UKERC Cross Cutting Characterisation	Systems Analysis related to energy R&D (Energy modelling) 20%; Not Cross-cutting 80%;
Principal Investigator	Project Contact No email address given SP Energy Networks
Award Type	Network Innovation Allowance
Funding Source	Ofgem
Start Date	01 December 2018
End Date	01 June 2020
Duration	ENA months
Total Grant Value	£200,000
Industrial Sectors	Power
Region	Scotland
Programme	Network Innovation Allowance
Investigators	Principal Investigator	Project Contact , SP Energy Networks (100.000%)
	Industrial Collaborator	Project Contact , SP Energy Networks (0.000%)
Web Site	https://smarter.energynetworks.org/projects/NIA_SPEN_0035
Objectives	This project proposes a technical method that will involve engaging researchers to investigate the issue of TRV and produce conclusions that may impact circuit breaker selection and application in a variety of networks. The investigations will address the TRV issue through network modelling, estimating the prospective TRV, identifying potential consequences and risks, and the means to mitigate these. The planning, training, operation and maintenance requirements of any viable mitigation options will also be established. This information can be used by network companies with similar installations. The project will be a feasibility study only, with its conclusions intended to further collective understanding of the issue while assessing the viability of mitigation strategies and technologies. Future projects can use this technology to decide if live trials are suitable. The scope of this project is to undertake work to quantify the potential range of TRV requirements at different voltage levels (33kV, 132kV, 275kV and 400kV) by considering the characteristics of the SPT, SPD, SPM, SHET and SHEPD networks. Based on the outcome, standard TRV requirements can then be established. The project will be a feasibility study only, with its conclusions intended to further collective understanding of the issue while assessing the viability of mitigation strategies and technologies. Future projects can use this technology to decide if live trials are suitable.More precisely the scope covers work which is carried out in the following stages: A thorough literature review to identify previous work in this area with regard to TRV standards and mitigation options. Where possible, this should also include notes and reports that have been compiled by working groups that set UK or international standards. Using load-flow and fault analysis network data as a starting point, a method to estimate the prospective TRV for various circuit breakers will be devised. This is expected to involve studies of electromagnetic transient behaviour in suitable software. With the exception of overhead lines, parameters for detailed transient modelling of network components are not generally available. Therefore, this part of the project should rely on typical plant characteristics in combination with e.g. sensitivity studies. Innovative approaches to dealing with this analysis will be encouraged during the project. For each voltage level, and also considering the IEC62271-100 ratings, the TRV capability that will ensure that most circuit breakers will operate within their rating will be developed. An investigation of different fault types (three-phase, line-ground etc.) and advice on the application of the IEC62271-100 ratings for different fault types. Guidance will be developed for the interpolation of circuit breaker TRV envelopes and the use of circuit breaker ratings for different fault scenarios i.e. terminal faults, short line fault, long line fault and out-of-phase. An investigation will be carried out into the impact of arc models (or the lack of an arc model) on TRV simulations and guidance will be provided for TRV simulations. This will include a discussion on the impact and suitability of generic arc models. An investigation into TRV mitigation options will be undertaken and these will be tested and have their efficacy demonstrated by carrying out further transient network studies. A high-level cost for each option will be established and comment on any potentialreliability or health and safety issues will be made. Practical guidance will be developed for designers to help identify situations where TRV is likely to exceed the standard circuit breaker capability and provide a number of mitigations options. A suitable guidance document will be produced, including an appendix with the reasoning behind the guidance provided.A progress report will be produced upon the completion of each step outlining the results and findings. The report on the analysis will make recommendations for standard SPEN and SSEN TRV ratings. The overall aim of this project is to quantify the potential range of TRV requirements at different voltage levels (33kV, 132kV, 275kV and 400kV) by considering the characteristics of the SPT, SPD, SPM, SHET and SHEPD networks. Based on the outcome, standard TRV requirements can then be established. Also, guidance will be formulated on how to identify cases where this standard TRV capability is insufficient and how to remedy the situation. The aims of the project can be broken down as below: Establish if the standard IEC 62271-100 TRV capabilities sufficiently cover the prospective TRV that circuit breakers will typically be subjected to in the SPT, SPD, SPM, SHET, SEPD and SHEPD networks (?33kV). Investigate if SPEN and SSEN specifications should require increased TRV capabilities for any voltage level and what the enhanced rating should be. Establish and provide guidelines that can be used to identify cases where the standard TRV capability is likely to be insufficient.Investigate and report on cost-effective, practical mitigation options that could be deployed instead of installing a circuit breaker with an enhanced TRV capability.
Abstract	The overall aim of this project is to quantify the potential range of TRV requirements at different voltage levels (33 kV, 132 kV, 275 kV and 400 kV) by considering the characteristics of the SPT, SPD, SPM, SHET and SHEPD networks. Based on the outcome, standard TRV requirements can then be established. Also, guidance will be formulated on how to identify cases where this standard TRV capability is insufficient and how to remedy the situation.
Publications	(none)
Final Report	(none)
Added to Database	15/12/22