Tests and commissioning activities for the Static Var

Tests and commissioning activities for the Static Var Compensators (SVCs) Karsten Kahle, Charles Genton, Francisco R. Blánquez Power Converter Group (TE-EPC) FOM, 25. 8. 2020 Indico 3976873

SVC Tests and Commissioning activities in LS 2 Agenda Introduction SVC MEQ 59 for the Meyrin 18 k. V network SVC BEQ 1 for SPS SVCs for LHC SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 2

SVC Tests and Commissioning activities in LS 2 Introduction SVC MEQ 59 for the Meyrin 18 k. V network SVC BEQ 1 for SPS SVCs for LHC SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 3

Why do we need SVCs? - Particle accelerators (power converters, RF etc. ) are very rough loads, comparable to heavy industry such as steel plants and rolling mills etc. - However, to obtain the precision required by the particle accelerators, the electrical network voltage needs to be a perfect 50 Hz sine-wave - In addition, our large cycles of reactive power would disturb the European 400 k. V network. SVCs strongly reduce the impact we have onto the outside network. Purpose of Static Var Compensators Assure the power quality of the 18 k. V networks, to allow the precision our accelerators require. SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 4

Basic topology of an SVC An SVC is composed of: TCR: Thyristor-Controlled Reactor Functions: • Network voltage stabilisation • Variable reactive power compensation Harmonic filters: passive filters tuned to specific frequencies Functions: • Harmonic filtering • Fixed reactive power compensation SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 5

Basic topology of an SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 6

Impact of SVC switching manoeuvres Switch-On the harmonic filters Switch-On TCR: no disturbances Switch-On harmonic filters: overvoltage +30% Recording of line voltages phase – ground (transient overvoltage typically +30% for 10… 20 ms) Voltage R – ground S – ground overvoltage T - ground Ref. EDMS 1026201 SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 7

Overview of SVC projects during LS 2 Four (4) large SVC projects simultaneously during LS 2 Total project budget about 20 MCHF SVC MEQ 59 for Meyrin network (rating 25 Mvar) SVC BEQ 1 for SPS (150 Mvar) Harmonic Filters of PA 4 and PA 8 for LHC (25 Mvar) And new control systems for TCRs in PA 2 -4 -6 -8. SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 8

SVC Tests and Commissioning activities in LS 2 Introduction SVC MEQ 59 for the Meyrin 18 k. V network SVC BEQ 1 for SPS SVCs for LHC SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 9

MEQ 59 for Meyrin 180 112 New SVC MEQ 59, located next to the 66 k. V transformer station in Meyrin (ref. GIS Portal # 1439) SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 10

MEQ 59 for Meyrin SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 11

MEQ 59 for Meyrin TCR coils (low-noise design) 12

MEQ 59 for Meyrin Installation work is 100% completed Commissioning taking place now (heat run tests) Most commissioning activities completed: Before 6 September 2020 Only very few SVC switchings required after 7 September 2020 Dynamic performance tests with Booster machine: W 41/2020 (starting 5. 10. 2020) Impact of SVC switching is limited to Booster and PS (supply by dedicated 66/18 k. V transformer in s/station ME 59). Activities directly coordinated with EN-EL. Switching manoeuvres always coordinated with CCC-TI. SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 13

SVC Tests and Commissioning activities in LS 2 Agenda Introduction SVC MEQ 59 for the Meyrin 18 k. V network SVC BEQ 1 for SPS SVCs for LHC SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 14

BEQ 1 for SPS BE substation BEQ 1 400 k. V substation CCC BEQ 3 BEQ 2 b. 774 SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 15

BEQ 1 for SPS SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 16

BEQ 1 for SPS SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 17

BEQ 1 for SPS SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 18

BEQ 1 for SPS Installation work is 95% completed Commissioning starts now, until Mid October First powering tests: end of Sept. / beginning of October Dynamic performance tests with SPS Mains beginning of 2021 (during TE-EPC commissioning of the SPS Mains) Impact of SVC switching is limited to one part of the SPS machine network, incl. the SPS pulsed loop (network of 400/18 k. V transfo EHT 1). Activities directly coordinated with EN-EL. Switching manoeuvres always coordinated with CCC-TI. SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 19

SVC Tests and Commissioning activities in LS 2 Agenda Introduction SVC MEQ 59 for the Meyrin 18 k. V network SVC BEQ 1 for SPS SVCs for LHC SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 20

SVCs for LHC The projects SEQ 4/SEQ 8 concern the consolidation of the harmonic filters. SEQ 4: Installation work is 50% completed, Powering tests in W 46, 47, 48/2020 SEQ 8: Installation work will take place W 36 – W 49/2020, Powering tests in W 51/2020 and W 1/2021 In addition, the Thyristor Controlled Reactors (TCRs) receive a new digital control system (in all 4 LHC points). Impact of SVC switching is always limited to the machine network of the concerned LHC point. Switching manoeuvres always coordinated with CCC-TI. SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 21

SEQ 4/SEQ 8 for LHC PA 4 LHC PA 8 SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 22

SVCs for LHC System Pre-requisites EPC proposed schedule Feedback from LHC Coordination Meeting on 14. 7. 2020 LHC PA 6, Powering tests of TCR and harmonic filters 66/18 k. V transformer and cooling water 28. , 29. , 30. 7. 2020 Maintenance in Sept. 2020 Tests are completed. T. b. d. LHC PA 2, Powering tests of TCR and harmonic filters 66/18 k. V transformer and cooling water TE-EPC ready from W 38/2020, 4 weeks of tests required W 38 - W 41/2020 approved LHC PA 4, Powering tests of TCR and harmonic filters 66/18 k. V transformer and cooling water TE-EPC ready from W 42/2020, 3 weeks of tests required Maintenance CV W 42 -45, Powering tests W 46 -47 -48/2020. LHC PA 8 (stage 1), Modif. of 66/18 k. V measurement circuit Switch-off 66/18 k. V transfo for 1. 5 days. Switch-over between LHC machine network and LHC loop. 1. 5 days anytime between today and end of October 2020 Possible betw. W 42 and W 45 during CV and CRYO maintenance. LHC PA 8 (stage 2), Powering tests of TCR and harmonic filters 66/18 k. V transformer and cooling water From December 2020, 3 weeks of tests needed Powering tests W 51/2020 and W 1/2021. SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 23

Thank you. Any questions? SVC Tests and Commissioning activities in LS 2 (TE-EPC), FOM 25. 8. 2020 24