1. YETS 2017-2018 & LS2 Works EN-EL / Power distribution
On behalf on EN-EL

2. EN-EL IMPACTS for the YETS 2017-2018 & LS2
Summary
The whole site
Meyrin
SPS
LHC
Maintenance
Projects and maintenance works on substation 400 kV & 66 kV

3. EN-EL IMPACTS for the YETS 2017-2018 & LS2
The whole CERN
Projects
New main substation for secured network (ME91) (YETS + before LS2) Underground access prohibited at LHC1, BA6 & BA7 during transfert of loads
Connection of new 400 kV substation BE2 to main 66kV substation (before LS2)
Renovation of the 400 kV protection and control system (BE) (LS2)
Consolidation 400 kV et 66kV substation (LS2)
Refurbishment ME9 substation (LS2) Lots of power cut on SG Meyrin
Replacement of the AutoTransfer automatism (PLC)
Maintenance
Maintenance UPS, 48V, transformers, HV & LV switchboard
Tests
Annual test for secured network 10’ power cut of « General Services » & « Secured » networks at 6:00 am in a working day (YETS + LS2) Prohibited access in underground
Auto-transfer test (YETS + LS2) Prohibited access in underground + limited power
PS – Booster impacted only a week-end on the Meyrin site
Meyrin - LHC1 - LHC18 - BA6 - BA7 Secured network not available only Saturday in working hours !
All other sites (SPS – LHC – 513 – MEY without PS – Prevessin – ZN…) repowered without power cut on degraded configuration during the week-end
BE2
YETS – Works EN-EL / Power distribution
On behalf on EN-EL

4. EN-EL IMPACTS for the YETS 2017-2018 & LS2
Meyrin site
Projects
Consolidation electrical network PSB + LIU upgrades (YETS + LS2)
Consolidation electrical network PS + LIU upgrades(YETS + LS2)
New main substation for secured network (ME91) (YETS + before LS2) Underground access prohibited at LHC1, BA6 & BA7
Refurbishment ME9 substation (LS2) Lots of power cut on SG Meyrin
Connection new compensator to main machine substation ME59 (TE-EPC) (LS2)
Maintenance
Maintenance UPS, 48V, transformers, HV & LV switchboard
Tests
Annual test for secured network 10’ power cut of « General Services » & « Secured » networks at 6:00 am in a working day (YETS + LS2) Prohibited access in underground
Auto-transfer test (YETS + LS2) Prohibited access in underground + limited power
AUG 4-5 days (YETS + LS2) Prohibited access
YETS – Works EN-EL / Power distribution
On behalf on EN-EL

5. EN-EL IMPACTS for the YETS 2017-2018 & LS2
SPS
Projects
48Vdc system replacement BA7 (YETS) 1st general power cut early YETS et 2nd 2 weeks after
Replacement of the Emergency lighting BA3 (YETS)
Crab cavity BA6 (RF) (YETS)
Refurbishment SPS substation 18kV & 400V (BA1, BA2, BA3, BA4 & BA6) (YETS + LS2)
Replacement of the Emergency lighting BA1, BA2, BA4, BA5, BA6 & BA7 (LS2 - 6 weeks/point)
New BAF3 substation (RF) (before LS2)
Connection of new compensator BEQ1 to main machine substation Prevessin site (LS2)
Maintenance
Maintenance UPS, 48V, transformers, HV & LV switchboard
Tests
Annual test for secured network 10’ power cut of « General Services » & « Safety » networks at 6:00 am in a working day (YETS + LS2) Prohibited access in underground
Auto-transfer test (YETS + LS2) Prohibited access in underground + limited power
AUG 1 day by site on working days – Arcs affected (YETS + LS2) Prohibited access in underground
BA6 & BM6
YETS – Works EN-EL / Power distribution
On behalf on EN-EL

6. EN-EL IMPACTS for the YETS 2017-2018 & LS2
LHC
Projects
Refurbishment LHC18 substation (UPS & 48V) (YETS) 2 days of power cut during AUG
LHC DIESEL consolidation (LHC2, LHC3, LHC3Z, LHC6 & LHC8) (TS + YETS + LS2 ) Safety network unavailable 3 weeks with many cuts
Refurbishment LHC18 substation (18 kV & 3.3 kV) (LS2) 2 months of power cuts (April - May 2019)
HL - LHC (LHC1, LHC4 et LHC5) (end of LS2)
HL-LHC works
Deviation cables for creation UPR (during YETS)
Works on 3.3 kV in LHC4 (during LS2)
Works for connection of new HL-LHC galleries (end of LS2)
Maintenance
Power transformers 66kV maintenance works (LS2) réseau machine
en puissance réduite
Maintenance UPS, 48V, transformers, HV & LV switchboard
Tests
Annual test for secured network 10’ power cut of « General Services » & « Safety » networks at 6:00 am in a working day (YETS + LS2) Prohibited access in underground
Auto-transfer test (YETS + LS2) Prohibited access in underground + limited power
AUG 9 days, 1 day by site on working days – Arcs affected (YETS + LS2) Prohibited access in underground
Test redundancy UPS (end of LS2)
YETS – Works EN-EL / Power distribution
On behalf on EN-EL

7. EN-EL IMPACTS for the EYETS 2016-2017
Maintenance works on 18 kV, 3.3 kV and LV networks
1/3 of the equipment 18 kV et 3.3kV : 400 cubicles
General services LV switchgears
Safety network LV switchgears
Planning - requirements
Slots of 5 to 6 days for each LHC points + BA5 & BA7 (including the AUG tests on the last day) and limited access on site (as done during LS1)
No underground access for 2 to 3 days (secured network not available)
No handling operations for 5 days (distribution off  cranes off)
No 18 KV maintenance during 400/66 kV maintenance operations
No secured network maintenance while AUTOTRANSFERT is off
Necessary coordination with CRG & CV
EYETS – Works EN-EL / Power distribution
On behalf on EN-EL

8. EN-EL IMPACTS for the YETS 2017-2018 & LS2
Projects and maintenance work on substation 400 kV & 66 kV
Projects
Replacement bushings on the 3 transformers 400kV/18kV (LS2)
Replacement 18 CTs 400kV (LS2) + 3 CTs 66kV (before LS2)
Installation new incomer 400kV EHD6/BE (LS2)
Installation of fire walls (LS2)
Consolidation 400 kV protection and control system + auxiliaries (LS2)
Fire protection system consolidation on transformers and 400 kV substation (LS2)
Maintenance
Power transformers 400 kV and 66kV maintenance works
Maintenance of the 400kV and 66kV circuit breakers works
Tests on RTE interface protections and various signals
YETS – Works EN-EL / Power distribution
On behalf on EN-EL

9. Thank you for your attention !