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Electrical Power Systems (WBS 4)

Electrical Power Systems (WBS 4). S. Ramakrishnan NCSX CDR May 21-23, 2002. Electrical Power System Requirements. Provide Source of all Electric Power for NCSX All AC Power At all Distribution Voltage levels 13.8kV,4.16kV,480V, 208/120V Includes Experimental AC Power

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Electrical Power Systems (WBS 4)

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  1. Electrical Power Systems (WBS 4) S. Ramakrishnan NCSX CDR May 21-23, 2002 S. Ramakrishnan Slide 1

  2. Electrical Power System Requirements • Provide Source of all Electric Power for NCSX • All AC Power • At all Distribution Voltage levels • 13.8kV,4.16kV,480V, 208/120V • Includes Experimental AC Power • Includes AC Power to NB • Includes all Auxiliary AC Power up to Power Panels • All DC Experimental Power • Provide DC power for stellarator coil systems • 3 Modular, 1 TF, and 5 PF coil circuits • PS requirements based on Initial Ohmic Scenario • Clear path for future upgrades (other scenarios, flexibility) • Provide Diagnostics support for Sensor cabling • Grounding S. Ramakrishnan Slide 2

  3. PPPL Site Plan FCPC BLDG FCPC Equipment tray TEST Cell NCSX Control Room Location NCSX C-Site Location S. Ramakrishnan Slide 3

  4. PPPL Partial Site Plan S. Ramakrishnan Slide 4

  5. D-Site Power Supplies • D-site power supplies used for Modular, TF, and PF circuits • Ample power and stored energy available (475 MVA and 2.2 GJ per MG) • Ample flexibility for future upgrades (78 PSS) • C-site supplies available for Trim coils S. Ramakrishnan Slide 5

  6. Power Supplies Shared with NSTX S. Ramakrishnan Slide 6

  7. Typical Ckt. Arrangement CT- Current Transducer PT-Voltage Transducer G- Ground fault Relaying

  8. Typical Circuit Arrangement Contd. • DC power transmitted from D-site (FCPC) to C-site (EF/OH Bldg) via overhead transmission (1000 MCM cables) • Disconnect and grounding switches provided at both ends • Existing cables used to connect to MG bus to Test Cell • Current/ Voltage transducers provided • Rapid changeover (4 hrs) possible S. Ramakrishnan Slide 8

  9. PS Control and Coil Protection • NSTX Electrical Power Systems Computer will be shared • Hardwired Control System (HCS) is provided • Modern PLC based system • Additional interlocks will be transmitted from C-Site to the D-Site PLC • Coil protection will also be provided • Instantaneous overcurrent • Ground fault • Timed overcurrent • I2t limit S. Ramakrishnan Slide 9

  10. Electrical Power System Costs Schedule: Complete Installation by Dec 2005

  11. Conclusions • Sharing existing D-site power supplies with NSTX is a cost-effective solution for powering NCSX coils • Existing AC power distribution system at C-site will feed other loads & have been used for PBX/PLT • Technical & cost risks is minimal • Since this is standard electrical work • Cost is based on industry feedback & PPPL experience on past projects • Is performed by experienced personnel. • Careful planning will mitigate schedule risk • Highest priority to Personnel Safety S. Ramakrishnan Slide 11

  12. S. Ramakrishnan Slide 12

  13. S. Ramakrishnan Slide 13

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