1. Power Converters and DC cablesSlide 1/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Water cooled cables warm bus bars power converter Energy Extraction

2. Power Converters and DC cablesSlide 2/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Introduction 1.Power converter reception tests and installation 2.DC cable reception tests and installation 3.Warm power tests without superconducting magnets 4.Cold power tests with superconducting magnets 5.Conclusion

3. Power Converters and DC cablesSlide 3/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 LHC Power Converters SR:Thyristor PCs for the warm magnets ARC: 60A corrector PCs UA:3.25kA and 2kA PCs 600A and 120A PCs MB PCs RR:2kA PCs 600A PCs 1700 converters with 98% underground 750*60A corrector converters (0.5kW) 740*120A&600A converters 220*2kA&3.25kA converters 8*13kA MB converters (2.6MW)

4. Power Converters and DC cablesSlide 4/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 LHC Power Converter DcctFGC Vref Magnet Power Part (Voltage Source) AC Mains Supply DC cables Power Interlock Controller Cooling System WorldFIP (Iref) DC cables Intk LHC Power Converters

5. Power Converters and DC cablesSlide 5/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Power converter tests before installation Power Part (Voltage source) FGC Dcct Individual Tests at CERN Surface Halls Individual Tests at manufacturer premises Power Part (Voltage source) FGC Dcct Power Part FGCDcct Converter Integration at CERN Surface Halls LHC Power Converter (Current source) : Performance validation Power converter reception tests

6. Power Converters and DC cablesSlide 6/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 PC installation Power converters installation the power converters are transported and installed in the tunnel without to be dismantled…

7. Power Converters and DC cablesSlide 7/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 PC installation … except the main dipole power converter 11 m 2.2 m Installation tests 40 t - By the specialists - In parallel with the short circuit tests Power converters installation

8. Power Converters and DC cablesSlide 8/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 DC cables Installation and tests Water cooled cable tests and installation The water cooled cables are not tested at CERN before their installation After their installation, the water cooled cables are only tested in pressure : 24 bars, 10 minutes in insulation : 3 kV DC with current leakage measurement

9. Power Converters and DC cablesSlide 9/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Powering circuit Energy Extraction Power Converter Magnet Intk syst Ctrl Room DC cables AC Main supply DC cable intk Cooling system Warm power tests (EDMS 464458 & 573115) Cold power tests (EDMS 519716)

10. Power Converters and DC cablesSlide 10/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Warm power tests 8 hours heat run tests for superconducting circuits The objectives of this test are to valid AC connexion of the power converter Installation of power converter Cooling of the DC cables DC connexions between power converter, DC cables and discharge system The magnet is replaced by a short circuit piece Hardware commissioning procedure EDMS 575406

11. Power Converters and DC cablesSlide 11/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Warm power tests 8 hours heat run tests for superconducting circuits Requests AC distribution UPS Water cooling system Ventilation system Short circuit pieces Energy extraction system for the 13kA and 600A with EE PIC for the 13kA

12. Power Converters and DC cablesSlide 12/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Warm power tests 8 hours heat run tests for warm magnets The objectives of this test are to valid AC connexion of the power converter Installation of power converter DC connexions between power converter, DC cables and magnet Set up of the current loop Power converter performance For transfer line power converters, the TI8 procedure is used

13. Power Converters and DC cablesSlide 13/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Warm power tests Requests AC network Interlock system Magnet 8 hours heat run tests for warm magnets

14. Power Converters and DC cablesSlide 14/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Warm power tests Interlock tests The objectives of this test are to valid Connexion between the interlock system and the power converter Comportment of the different system (power converter, interlock system and energy extraction system) Control Test The objectives of this test are to valid The WorldFIP (MUGEF for TL-PC) The Field Control Room softwares The Alarm system, Logging system and Post Mortem system

15. Power Converters and DC cablesSlide 15/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 24 hours heat run test for superconducting circuits The objectives of this tests are to valid Global water cooling system Global air conditioning system Global AC distribution Global control of power converters by the FCR Warm power tests

16. Power Converters and DC cablesSlide 16/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Warm power tests 10 weeks for a sector - 5 weeks for an UA - 3 weeks for a RR - 2 weeks for an arc Sector 78

17. Power Converters and DC cablesSlide 17/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Circuit type tests (60A, 120A, etc…) First Powering tests (at minimum stable current) Check the start of the power converter Set up of current loop and verify the stability Safety system Intermediate current Verify the current loop stability Safety system Nominal current Power converter performance in current source Cold power tests (EDMS 519716)

18. Power Converters and DC cablesSlide 18/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Main dipole circuits Main issues with the RB circuits Starting of the power converter (> 20 s to go to the minimum current) Setting current loop (noise of the current measurement) Discharge system in the odd point Recuperation mode Safety system Power converter performance in current source Cold power tests

19. Power Converters and DC cablesSlide 19/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 MQM circuits Main issues with the MQM circuits Starting of the 2 power converters Setting current loop and verify the performance (resistive coupling) Safety system 6 kA Cold power tests

20. Power Converters and DC cablesSlide 20/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Inner Triplet main quadrupole circuits (EDMS 531773) RST - I ref1 I pc1 RST - I ref2 RST - I ref3 I pc3 I pc2 Decoupling system 4.7 kA±600 A 7 kA I pc1 I pc2 I pc3 V ref1 V ref2 V ref3 7 kA Cold power tests

21. Power Converters and DC cablesSlide 21/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Test strategy Test the 5 kA circuit alone (inner power converter) Test the 7 kA circuit alone (outer power converter) Test the 5 kA + 7 kA with decoupling loop Test the 5 kA + 7 kA + 0.6 kA with decoupling loop Set up of the current loops Inner Triplet main quadrupole circuits 4.7 kA±600 A 7 kA Cold power tests

22. Power Converters and DC cablesSlide 22/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Cold power tests Other sector: 7 days for the 3 main circuits 8 days for the IT circuits 4 days for the other circuits First sector: 14 days for the 3 main circuits 16 days for the IT circuits 8 days for the other circuits

23. Power Converters and DC cablesSlide 23/.. LHC - HC review Hugues THIESEN – AB/PO Thursday, 12 May 2005 Conclusions 1.The power converters are tested before their installation but theses tests are limited not real load not real environment not with the other systems (PIC and WorldFIP) 2.The DC cables are not tested before their installation not tests in power 3.The main circuits (RB and RQ) and Inner Triplet request a special attention