1. NCSX NCSX CDR May 27 2005 S. Ramakrishnan Slide 1 Electrical Power Systems (WBS 4) S. Ramakrishnan NCSX CDR May 27 2005

2. NCSX NCSX CDR May 27 2005 S. Ramakrishnan Slide 2 Electrical Power System Requirements Provide Source of all Electric Power for NCSX –All AC Power At all Distribution Voltage levels »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

3. NCSX NCSX CDR May 27 2005 S. Ramakrishnan Slide 3 PPPL Site Plan NCSX C-Site Location NCSX Control Room Location

4. NCSX NCSX CDR May 27 2005 S. Ramakrishnan Slide 4 C-Site Power Supplies C-site Rectifier power supplies used for Coil circuits –Six (6) Robicon Rectifier Supplies. Each of (2) 6-pulse, 2- quadrant converters in parallel - 12-pulse rectified DC output. –One (1) PEI Rectifier Supply. Two 6-pulse rectifier bridges in parallel - 12-pulse DC output Sufficient power available for First Phase Future upgrades with D-Site Supplies

5. NCSX NCSX CDR May 27 2005 S. Ramakrishnan Slide 5 Power Supplies Assignment 1st plasma & Magnetic Configuration (2/2009) CircuitPower Supply Current 1.5s / 180s VoltsCW (MW) M1+M2+M3P2020kA500V10 TFP5-3 (5kA unit)5kA300V1.5 PF1,2P5-1+ P5-45kA300V+300V1.5 PF3 P5-25kA300V1.5 PF4 PEI5kA500V2.5 PF5NoneNA PF6P1010kA200V2

6. NCSX NCSX CDR May 27 2005 S. Ramakrishnan Slide 6 Typical Circuit Arrangement Contd. Disconnect and grounding switches provided for each circuit Existing cables used from Rectifier Supplies to Disconnects in Test Cell Basement New Cables (4/c- 500mcm, 600V) from Disconnects to the Bus Stubs in the Tunnel Current/ Voltage transducers provided Changeover to CDX possible by disconnecting cables at top of Disconnects.

7. NCSX NCSX CDR May 27 2005 S. Ramakrishnan Slide 7 PS Control and Coil Protection PLC will be provided for Hardwired Controls –Modern PLC based system –Additional interlocks as needed –Coil protection will be provided Instantaneous overcurrent Ground fault Timed overcurrent I 2 t limit

8. Electrical Power System Costs SystemStartFinishLaborM&STotal 411 - Auxiliary AC Power Jan-05Jan-07$258,515$123,515$382,030 412 - Experimental AC Power Oct-06Feb-08$41,214$6,929$48,143 431 - C-site AC/DC Converters Oct-04Mar-07$319,797$134,345$454,142 441 - Electrical Interlocks Oct-06Nov-08$252,217$125,447$377,664 442 - Kirk Key Interlocks Oct-06Nov-07$33,708$48,475$82,183 443 - Real Time Control Apr-07Nov-07$14,271 444 - Instrumentation Oct-06Dec-07$197,474$115,180$312,654 445 - Coil Protection Oct-05Nov-07$452,426$69,677$522,104 451 - System Design Apr-03Nov-08$520,501 452 - Electrical Systems Support Oct-06Mar-08$257,580$4,156$261,736 453 - System Testing Oct-06Mar-08$275,996$48,723$324,719 460 - April-Sept MIE Cost Apr-03Sep-03$1,300 TOTAL $2,624,998$676,447$3,301,445

9. NCSX NCSX CDR May 27 2005 S. Ramakrishnan Slide 9 Conclusions Using existing C-site Rectifier supplies for First Plasma is cost-effective 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

10. NCSX NCSX CDR May 27 2005 S. Ramakrishnan Slide 10 TF & PF1,2 FEEDS

11. NCSX NCSX CDR May 27 2005 S. Ramakrishnan Slide 11 PF3, 4, & 6 FEEDS

12. NCSX NCSX CDR May 27 2005 S. Ramakrishnan Slide 12 MODULAR COIL FEED