THE HIGH-VOLTAGE NETWORK OF CERN TODAY François Duval Head of the Electrical Engineering Group EN Department CERN Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System October 24-26, 2012
Outline Part 1 The High Voltage grid Sources of Energy at CERN Normal operation The Status of the CERN Degraded Operating Modes Distribution Network Critical Points Part 2 Present Power Consumption Estimates at the HL-LHC Horizon Present Methodology Consumption and Future Power Requirements Estimates October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 2
The CERN Accelerator Complex October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 3
The layout October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 4
The Layout of the HV Grid October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 5
The Present HV Network 1970’ s Prévessin & the SPS 1980’s - 2000 LHC 1950 - 1960’s & the PS Meyrin October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 6
The Present HV Network Main source EDF > 300 MW Alternative source SIG/ALPIQ ≤ 60 MW October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 7
The Different Voltage Levels 400 kV From the French grid through an interconnection substation “Bois - Tollot ” located 300 m from CERN 400 kV. An OHL is connected to the busbar (no incomer). From this busbar, 5 CBs feed 5 power transformers (3 400/18 kV and 2 400/66 kV) 66 kV Feeds 5 LHC Points & the Prevessin Distribution Substation (BE9) from a double busbar substation with no redundancy. 20 kV Safety feeders from public distribution at LHC points 18 kV Various 18 kV distribution system (loops, antenna distribution with redundancy, direct feeders to big loads) 6.3 kV Local system from Diesel generators 3.3 kV Local 3.3 kV system for big motors (compressors) and Diesel generators October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 8
The Sources of Energy at CERN October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 9
The Sources EDF/RTE 400MVA SIG/Alpiq 60MVA Emergency source The evolution Sharing between the two sources until 1995, For cost reasons and the limited available power the relegation of the SIG source to a back-up source to be used only in case of outage of the EDF source or during maintenance October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 10
Quality The quality of the energy delivered at CERN is affected by external and internal causes: Internal High level of Harmonics from power converters Voltage drops from short circuits Lack of selectivity External Harmonics 2 from Power transformers energizing through CERN filters October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 11
Quality Voltage drops due to faults on the grid (mainly lightning) This topic was specified for the LHC project (EDMS 113154 Main parameters of the LHC 400/230 V distribution system) October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 12
Quality October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 13
Normal Operation The 66 kV network of the LHC Sites and the General Services for the the LHC, the SPS and its North Experimental Area EHT4 and EHT5 110MVA ▶ 400/66 kV, identical and operate in parallel EHT7 70 MVA 66/18 kV feeds ▶ the General Services of the Prevessin Site, the SPS and the LHC The LHC is fed, without any ▶ redundancy, from LHC points 1 EHT102 70 MVA 66/18 kV 2, 4, 6 & 8, EHT102/103 38 MVA 66/18 kV October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 14
Normal Operation The 18 kV pulsed network of the magnet system of the SPS and its North Experimental Area From the BE substation which is ▶ made of 3 busbars, each one fed from a 400/18 kV 90 MVA transformer, each busbar is connected to an SVC system of 120/150 MVAR 2 busbars out of 3 are necessary to ▶ operate the pulsed network The high capacitive current generated ▶ by the SVC is higher than the performance of the 18 kV CB, therefore the busbar protection is supported by the 18 kV incomers with the risk of high capacitive currents to be cut. October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 15
Normal Operation The Meyrin Site All the Meyrin site is fed from the ▶ main substation in LHC Point 1 through the MP5 link (60 MVA) There is no separation between ▶ General Services network and the facilities (accelerators, experimental areas, computer centre, etc.) October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 16
Normal Operation Autotransfert There is an automatic ▶ reconfiguration of the general services network called AUTOTRANSFERT managed by PLCs. It is based on the presence of ▶ voltage on the following busbars: BE9, ME9 and SEM12 October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 17
Degraded Operation With the present consumption (LHC at 4 TeV) the network is able to cope with the outage of one major component: a transformer (400/66 kV or 66/18 kV) or an 18 kV site inter-site link. In the event of such a failure, the 18 kV network can be reconfigured to support accelerator operations at nominal power. See EDMS document no. 1079852 October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 18
Degraded Operation Outage of EHT7 The load is taken by EHT3 October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 19
Degraded Operation Outage of EHT102 in LHC Poin t 1 The load is taken via inter-site link MP6 on EHT7 and from SIG October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 20
Degraded Operation Outage of EHT4 or EHT5 The load is taken by EHT3 October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 21
Degraded Operation Outage of EHT102 in any of the LHC Points 2,4,6 or 8 No redundancy ! (only spares: one week to repair) October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 22
Degraded Operation Outage of inter-site link MP5 The load is taken via inter-site link MP6 and EHT7 October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 23
Degraded Operation Outage of inter-site link MP7 The load is taken via inter-site link MP6 October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 24
Critical Points The network has a number of weak points that affect operational capability, availability, maintainability, economy, reliability and safety. There are components the failure of which would have a long-term impact on accelerator operations and/or have operational limitations linked to network dimensioning and maintenance. October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 25
Operational Capability 1 The Meyrin site is fed only by one substation (ME9 JURA). This substation has two sources: SIG/Alpiq (Switzerland) through ME10 EDF (France) through LHC Point 1 Operation with a single 400/66 kV 110 MVA transformer is only possible if transformer EHT3 do not operate on the SPS pulsed network. The network does not allow reconfigurations to supply loads which are critical for the operation of the LHC October 24th, 2012 Review of the Project for the Consolidation and Upgrade of the CERN Electrical Distribution System François Duval - 26
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