TC CO July HCC report HCC report Summary of the tests of the LSS8L power converters in short-circuit F. Rodríguez-Mateos on behalf of R.Ballet-Thouble, E.Barbero-Soto, F.Bordry, S.Brown, M.Cayla, P.Charrue, F.Chevrier, Ch.Coupat, PY.Collaud, C.Dehavay, JY.Dutoit, A.Foreste, E.Garde, JC.Guillaume, E.Hatziangeli, J.Iñigo-Golfín, Q.King, M.Lamont, R.Lauckner, E.Molina, B.Ocelli, S.Page, J.Pedersen, R.Saban, H.Thiesen, J.Thomsen, J.Wozniak

TC CO July Outline  Equipment under test configurations  Procedures  Main findings  Conclusions and outlook

TC CO July Q5 RQ5.L8B1 RQ5.L8B2 RCBCH5.L8B1 RCBCHS5.L8B1 RCBCHS5.L8B2 RCBCV5.L8B2 RCBCVS5.L8B1 RCBCVS5.L8B2 Q4 RQ4.L8B1 RQ4.L8B2 RD2.L8 RCBYH4.L8B2 RCBYHS4.L8B1 RCBYHS4.L8B2 RCBYV4.L8B1 RCBYVS4.L8B1 RCBYVS4.L8B2 XL8 RQX.L8 RTQX1.L8 RTQX2.L8 RD1.L8 RCBXH1.L8RCBXV1.L8 RCBXH2.L8RCBXV2.L8 RCBXH3.L8RCBXV3.L8 RQSX3.L8 RCOSX3.L8 RCOX3.L8 RCSSX3.L8RCSX3.L8 RCTX3.L8 [4kA/8V][5kA/8V] [±120A/±10V] [7kA/8V] [±120A/±10V] [±600A/±10V] Equipment under test courtesy H.Thiesen

TC CO July PC 18kV 400V Water UPS RCBYH4.L8B2 RCBYHS4.L8B1 RCBYHS4.L8B2 RCBYV4.L8B1 RCBYVS4.L8B1 RCBYVS4.L8B2 RCBCH5.L8B1 RCBCHS5.L8B1 RCBCHS5.L8B2 RCBCV5.L8B2 RCBCVS5.L8B1 RCBCVS5.L8B2 RCOSX3.L8 RCOX3.L8 RCSSX3.L8 RCSX3.L8 RCTX3.L8 RD1.L8 RD2.L8 RCBXH1.L8 RCBXH2.L8 RCBXH3.L8 RCBXV1.L8 RCBXV2.L8 RCBXV3.L8 RQSX3.L8 Power converters configurations (1) PC2 18kV 400V Water UPS PC1 RQ4.L8B1 RQ4.L8B2 RQ5.L8B1 RQ5.L8B2 courtesy H.Thiesen

TC CO July A4.7kA7kA I.T. En 18kV 400V FIP PIC Water Cal. UPS Chilled Water RQX.L8 RTQX1.L8 RTQX2.L8 Power converters configurations (2) courtesy H.Thiesen

TC CO July

ActionEquipment Group(s) Responsible 1The individual electrical feeder is unlocked and the converter is connected to the grid AB/PO TS/EL 2Tests to verify that the converter shuts down in case of loss of cooling water in the converter or in the cables and tubes AB/PO TS/EL TS/CV 3The converter is turned on and the control loop is tuned AB/PO 4Tests to verify the remote operation of the power converter via the WorldFip AB/PO AB/CO 58-hour heat runs at I ult carried-out with the converter connected to the Control Network AB/PO TS/EL TS/CV Procedures

TC CO July The findings  Cabling Thermal behaviour of cables is very sensitive to their arrangement on trays, ducts, transitions, etc. Corrections have been applied and validated Validation of optimized sections (240 and 35 mm2, respectively, for corrector circuits generically known as “600A”and “120A”): special attention to hot spots A more complete procedure for high voltage tests on water-cooled cables is required The crimped fittings on the flexible tubes of the water cooled cables must be insulated Indirect cooling of cables in the ducts: an alarm must be generated if the temperature exceeds a given value  Water cooling Setting and balancing of water circuits must be done before short-circuit tests start Scheme for three-cable circuits (Q4,Q5) will be changed  Reference Database: ultimate currents

TC CO July The findings (2)  Power converters Estimated times for the different phases are confirmed Contrary to what was initially specified, World-Fip has to be operational from the very beginning of the tests While the individual commissioning of the PC is done in situ, the field control room is really needed for the parallel testing during the 8-h heat runs The power terminals of one of the IT high-current converters seem to be too far apart  “Visites d’inspection” must be scheduled well in advance be documented in such a way that the different Groups see clearly the points which pertain to their systems be attended by the engineers responsible of each system also focus on a global system approach

TC CO July The findings (3)  Controls The sequencer – invaluable tool Logging – not really operational Alarms – not mature but ran solidly Fixed displays – running from the start but needs refinement e-logbook was missing Communication infrastructure – performed as expected  Control room Noisy environment, not easy to have discussions!  MTF has been operational from the first moment, and proves to be very useful and necessary IN THE FIELD

TC CO July Conclusions  It has been a successful start of the LHC HC  We have gathered plenty of valuable information that must be now documented and retrofitted: cabling controls converters cooling coordination environment inspections safety  We need to optimize preparations and procedures update the Reference Database (and drawings) update LHC-R-HCP-0001 refine the procedure for high voltage tests of water-cooled cables implement procedure for the water flow settings define procedure for the “visite d’inspection”

TC CO July Outlook  In September everything we have learnt will be applied to a larger scale i.e. the complete set of converters in UA83  Every finding, every non- conformity, every new lesson must be documented. HCC will follow it up  Everyone has shown great flexibility and collaboration spirit: we must keep it up!

TC CO July Ultimate currents