Evidencing Method Gamma Will Provide Outlined Learning

SUCCESSFUL DELIVERY REWARD CRITERIA REPORT EVIDENCING METHOD GAMMA WILL PROVIDE OUTLINED LEARNING SUCCESSFUL DELIVERY REWARD CRITERIA REPORT EVIDENCING METHOD GAMMA WILL PROVIDE OUTLINED LEARNING Contents 1 Introduction ............................................................................................................................................................ 4 2 Progress and learning to date of Method Alpha and Method Beta (Criterion i) .................................................... 5 2.1 Progress and learning to date of Method Alpha ............................................................................................. 5 2.1.1 Integration of Methods ...................................................................................................................... 6 2.2 Progress and learning to date of Method Beta ............................................................................................... 8 3 Proposed Methodology for Method Gamma (Criterion ii) ................................................................................... 10 3.1 Introduction .................................................................................................................................................. 10 3.2 Method Gamma Substations ........................................................................................................................ 10 3.3 Technology Overview .................................................................................................................................... 10 3.4 Resistive Superconducting Fault Current Limiters ........................................................................................ 11 3.4.1 Operation ......................................................................................................................................... 11 3.4.2 Performance ..................................................................................................................................... 12 3.5 Pre-Saturated Core Fault Current Limiters.................................................................................................... 12 3.5.1 Operation ......................................................................................................................................... 12 3.5.2 Superconducting DC coils ................................................................................................................. 13 3.5.3 Performance ..................................................................................................................................... 13 3.6 Power Electronic Fault Current Limiter ......................................................................................................... 14 3.6.1 Overview........................................................................................................................................... 14 3.6.2 Performance ..................................................................................................................................... 14 3.7 Technology Tender Process .......................................................................................................................... 15 3.7.1 Overview........................................................................................................................................... 15 3.7.2 Invitation to Tender .......................................................................................................................... 15 3.7.3 Site Specific Pro-forma ..................................................................................................................... 15 3.7.4 Post Tender Negotiations ................................................................................................................. 15 3.8 Substation Technology Selection .................................................................................................................. 15 3.8.1 Overview........................................................................................................................................... 15 3.8.2 Kitts Green 132/11kV Substation ..................................................................................................... 16 3.8.3 Castle Bromwich 132/11kV Substation ............................................................................................ 19 3.8.4 Chester Street 132/11kV Substation ................................................................................................ 22 3.8.5 Bournville 132/11kV Substation ....................................................................................................... 25 3.8.6 Sparkbrook 132/11kV Substation ..................................................................................................... 28 3.8.7 Summary .......................................................................................................................................... 31 4 Process followed to consult other DNOs (Criterion iii) ......................................................................................... 32 5 Written responses from other DNOs (Criterion iv) ............................................................................................... 34 6 Appendices ............................................................................................................................................................ 34 Page 2 of 34 SUCCESSFUL DELIVERY REWARD CRITERIA REPORT EVIDENCING METHOD GAMMA WILL PROVIDE OUTLINED LEARNING DISCLAIMER Neither WPD, nor any person acting on its behalf, makes any warranty, express or implied, with respect to the use of any information, method or process disclosed in this document or that such use may not infringe the rights of any third party or assumes any liabilities with respect to the use of, or for damage resulting in any way from the use of, any information, apparatus, method or process disclosed in the document. © Western Power Distribution 2013 No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means electronic, mechanical, photocopying, recording or otherwise, without the written permission of the Future Networks Manager, Western Power Distribution, Herald Way, Pegasus Business Park, Castle Donington. DE74 2TU. Telephone +44 (0) 1332 827446. E-mail [email protected] Glossary of terms Abbreviation Term CHP Combined Heat and Power DC Direct Current DNO Distribution Network Operator DPCR-5 Distribution Price Control Review 5 EHV Extra High Voltage (voltages above 22,000V) EMF Electro-Magnetic Field FCL Fault Current Limiter FL Fault Level FSP Full Submission Pro-forma GSP Grid Supply Point GT Grid Transformer HSE Health & Safety Executive HV High Voltage (voltages above 1,000V but below 22,000V) ITT Invitation to Tender MVA Mega Volt Ampere MW Mega Watts PEFCL Power Electronic Fault Current Limiter PSCFCL Pre-Saturated Core Fault Current Limiter PTN Post Tender Negotiations rms Root Mean Square RSFCL Resistive Superconducting Fault Current Limiter SDRC Successful Delivery Reward Criteria WPD Western Power Distribution The X/R ratio is the ratio of the system reactance to the system resistance looking back towards the power source from any point in the network. When a fault occurs the fault current that flows comprises of two contributing elements, ac and dc. The ac symmetrical component is determined by the total system impedance between power source and fault. The dc component X/R represents the asymmetry in the fault and decays over a short period of time. The X/R ratio is effectively a time constant that determines the speed of this decay. The actual fault current that is required to be interrupted by a circuit breaker is a combination of the dc and ac symmetrical currents and hence the slower the decay, the higher the prospective current that requires interrupting. Page 3 of 34 SUCCESSFUL DELIVERY REWARD CRITERIA REPORT EVIDENCING METHOD GAMMA WILL PROVIDE OUTLINED LEARNING 1 Introduction This document fulfils the sixth Successful Delivery Reward Criterion of FlexDGrid “Evidencing Method Gamma will provide outlined learning” (SDRC-6). The purpose of this document is to detail that the requirements specified in Section A of the Project Direction document, provided by Ofgem, have been satisfied. Section A of this document is detailed below: A) Methodology of Method Gamma The Funding DNO must, prior to signing binding contractual agreements for the fault level mitigation technologies, as described in Section 2 (Project Description), provide a report including the following information: (i) The progress, including learning to date, of Method Alpha – Enhanced Fault Level Assessment and Method Beta – Real-time Management, as described in Section 2 (Project Description); (ii) A proposed methodology for Method Gamma – Fault Level Mitigation Technologies, as described in Section 2 (Project Description). This must include a functional description of the five proposed fault level mitigation technologies and five proposed substations. It must also include an explanation of, based on the learning described in (i); (iii) A description of the process the Funding DNO has followed to consult with other GB DNOs on whether, based on the information provided in (i) and (ii), proceeding to Method Gamma – Fault Level Mitigation Technologies would provide the learning outlined in the Full Submission pro-forma. This must include

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