1 / 17

ABOC/ATC days Electrical Network: Selectivity and Protection Plan

ABOC/ATC days Electrical Network: Selectivity and Protection Plan. José Carlos GASCON TS–EL Group 22 January 2007. Summary. Introduction Selectivity CERN HV electrical 29 th July 2006 Selectivity at CERN Project Planning.

rosewoods
Download Presentation

ABOC/ATC days Electrical Network: Selectivity and Protection Plan

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ABOC/ATC days Electrical Network: Selectivity and Protection Plan José Carlos GASCON TS–EL Group 22 January 2007

  2. Summary • Introduction • Selectivity • CERN HV electrical • 29th July 2006 • Selectivity at CERN • Project Planning Prepared by José Carlos GASCON ATC/ABOC Days22 January 2007

  3. Introduction Source Order Switchgear Measurement Sensor Protective relay Protected area • Protection system in the electrical network • Switchgear: in charge of clearing faults • Sensors: providing measurements to detect faults • Protective relays: processing measurements and ordering to clear faults Prepared by José Carlos GASCON ATC/ABOC Days22 January 2007

  4. Introduction • Why protection system is needed • Personnel safety against electrical hazards • Avoid equipment stress: thermal, electrical and mechanical damages • Assure network stability • Clear electrical faults and maintain service continuity • Features of protection system • Fast • Reliable • Selective Prepared by José Carlos GASCON ATC/ABOC Days22 January 2007

  5. Selectivity • Definition • Discrimination between protection systems, isolating a faulty area of the electrical network as quickly as possible and leaving all the fault-free areas energized • How to do • Time based discrimination • Current based discrimination • Logic discrimination • Directional protection discrimination • Differential protection discrimination • Combined Prepared by José Carlos GASCON ATC/ABOC Days22 January 2007

  6. Selectivity • Parameters • The complexity and size of the electrical network • Network architecture • Existing sources and their response in the event of a fault • Operating time of each protection system • Backup time • Compromise continuity of service vs. degree of protection Prepared by José Carlos GASCON ATC/ABOC Days22 January 2007

  7. Selectivity: examples Radial distribution Loop distribution (ex.: SPS) ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Prepared by José Carlos GASCON ATC/ABOC Days22 January 2007

  8. CERN HV Electrical Network • Complexity • Voltage levels: 400kV, 130kV, 66kV, 20kV, 18kV and 3,3kV • 94 HV substations: 38 LHC, 26 SPS and 30 Meyrin • 4 sources: EDF (400kV & 20kV), EOS and Diesel Generators • 3 different interconnected networks by site: • LHC: Machine, General Services and Safety (Assured) • SPS: Pulsed, Stable and Safety (Assured) • Meyrin: Pulsed, General Services and Safety (Assured) • Sites interconnected by 18kV links • Power flow direction depending on the configuration • About 1,000 protective relays and switchgears • Compensators and harmonic filters • Diversity of loads:pumps, converters, dipoles, transformers, compressors Prepared by José Carlos GASCON ATC/ABOC Days22 January 2007

  9. CERN HV Electrical Network • Protection system • Switchgears from all ages : specific clearing time for each generation • Different technologies in protective relays 40% digital, 40% electronics and 20% electromechanical Prepared by José Carlos GASCON ATC/ABOC Days22 January 2007

  10. 29th July 2006 (I) EDF- 400 kV T5 400/66 kV 110 MVA EHT102/1E 66/18kV 70MVA EHT7/E9 66/18 kV 70 MVA SEH9 – 66kV EHD27 EHD21 201 200 BE9 – 18kV 412 ASS HALL N.A. LOOP SPS LOOP LHC LOOP 901 900 800 801 SEM12 – 18kV Earthing transformer 701 802 MEYRIN SITE 209 .... ME9 – 18kV 114 311 104 204 210 304 ME10 – 18kV EHT612/1E 130/18 kV 60 MVA EOS - 130 kV 1st fault events • 1 ph. fault detected in neutral reactance • 3 ph. detected by all prot. but blocked • Protections trip 66kV and 130kV sources ! ! ! ! ! Prepared by José Carlos GASCON ATC/ABOC Days22 January 2007

  11. 29th July 2006 (II) EDF- 400 kV T5 400/66 kV 110 MVA EHT7/E9 66/18 kV 70 MVA SEH9 – 66kV EHD27 EHD21 201 200 BE9 – 18kV 412 EHT102/1E 66/18kV 70MVA ASS HALL N.A. LOOP SPS LOOP LHC LOOP 901 900 800 801 SEM12 – 18kV Earthing transformer 701 802 MEYRIN SITE 209 .... ME9 – 18kV 114 311 104 204 210 304 ME10 – 18kV EHT612/1E 130/18 kV 60 MVA EOS - 130 kV 2nd fault after “autotransfer system” • 3 ph. detected by all prot. but blocked • Protection trips at 66kV source ! ! ! ! ! ! ! Prepared by José Carlos GASCON ATC/ABOC Days22 January 2007

  12. 29th July 2006: consequences • Power cuts • LHC General Services • SPS Stable loop • North Area Stable loop • Meyrin site: West Area and PS, ISOLDE and Administrative loops • After analyse of the event • Difficult selectivity between 66kV and 18kV levels • Backup time not adapted for this scenario • If selectivity, power cut reduced to the Meyrin site and lower reestablishment time Prepared by José Carlos GASCON ATC/ABOC Days22 January 2007

  13. 29th July 2006: selective EDF- 400 kV EHT7/E9 66/18 kV 70 MVA EHT102/1E 66/18kV 70MVA T5 400/66 kV 110 MVA SEH9 – 66kV EHD27 EHD21 201 200 BE9 – 18kV 412 ASS HALL N.A. LOOP SPS LOOP LHC LOOP 901 900 800 801 SEM12 – 18kV Earthing transformer 701 802 MEYRIN SITE 209 .... ME9 – 18kV 114 311 104 204 210 304 ME10 – 18kV EHT612/1E 130/18 kV 60 MVA EOS - 130 kV ! ! ! ! ! Prepared by José Carlos GASCON ATC/ABOC Days22 January 2007

  14. Selectivity at CERN • Implemented selectivity • 400kV backup agreed with EDF • LHC General Services and Machine • SPS pulsed and stable loops • PS, ISOLDE and Administrative loops • Non-selective areas (tripping 66 kV) • Autotransfert system (BE9, SEM12 and ME9 substations) • West Area • North Area • LHC-1 and LHC-5 (in project) Prepared by José Carlos GASCON ATC/ABOC Days22 January 2007

  15. Planning (I) • Activities in progress • Catalogue of protective relays: 60% completed • Short circuit calculations: under approval • Selectivity Phase 1 (April 2007) • Selectivity study for the non-selective areas • Data base for all protective relays installed • Provisional solution for the non-selective areas Prepared by José Carlos GASCON ATC/ABOC Days22 January 2007

  16. Planning (II) • Selectivity Phase 2 (January 2008) • Definitive solution for non-selective areas • Complete selectivity map for main substations and configurations • Implementation • Commissioning • Selectivity Phase 3 (in the course of 2008) • Selectivity map for the whole CERN HV network • Transient simulations for main substations (BE, BE9, ME10, ME9, SEM12) Prepared by José Carlos GASCON ATC/ABOC Days22 January 2007

  17. ABOC/ATC days Electrical Network: Selectivity and Protection Plan Questions? José Carlos GASCON TS–EL Group 22 January 2007

More Related