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

NCSX NCSX CDR May 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

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

NCSX NCSX CDR May 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

NCSX NCSX CDR May 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

NCSX NCSX CDR May 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.

NCSX NCSX CDR May 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

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

NCSX NCSX CDR May 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

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

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

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