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DIPARTIMENTO FPN SEZIONE ELETTROTECNICA ED ELETTRONICA (FUS ING) Title: Technical Requirements for the Multi-Pinch (PROTO-SPHERA/Phase 1) experiment power supplies Reference: Doc.Nb. MULTI-PINCH ING.A.PS.002.S Scope: Date - Revision 19/03/2007 rev.2 Signatures Author(s) Approved by Emitted by A. Coletti FPN/ FUS - ING DOC. DATE PAG. ING.A.PS.002.S rev.2 19/03/2008 2 REVISIONS Rev. Date 0 1 2 01/08/07 05/10/07 19/03/08 Paragraph 2 Scope of Revision First emission General revision Modified voltage control for the Cathode power supply (Phase 1) 2 FPN/ FUS - ING DOC. DATE PAG. ING.A.PS.002.S rev.2 19/03/2008 3 INDEX Introduction Pag.4 1. Poloidal Field Coils (Group B) power supply Pag.4 2. Cathode power supply (PROTO-SPHERA Phase 1) Pag. 4 3. Pinch power supply (PROTO-SPHERA Phase 1) Pag. 5 3 FPN/ FUS - ING DOC. DATE PAG. ING.A.PS.002.S rev.2 19/03/2008 4 Introduction This document sketches, in a very short way, the tecnical specifications for the power supplies of the Multi-Pinch experiment (PROTO-SPHERA/Phase 1) which is under construction at the ENEA Frascati Research Centre. l. Poloidal Field Coils (Group B) power supply Vin: 20 kVAC; ±10%, 50 Hz three-phase Vout: 350 VDC (twelve-phase feedback) Iout: 1.9 kA (DC) Load: R - 80 mOhm; L – l0 mH Current rise/descent time < 100 msec Pulse duration: 2 sec, 5 min minimum repetition time. Accuracy of delivered current (including ripple): ±2% (referred to Iout) Feedback current regulation, through local and remote reference waveform. Local and remote measurements (optically decoupled) with accuracy ±1%: Vout, Iout Protections : 1. Fuses on each high power solid state component and controls on maximum Iout and maximum pulse duration (to be set locally) 2. Statical crow bar / non-linear resistances against overvoltages 2. Cathode power supply (PROTO-SPHERA Phase 1) It is essentially built as a transformer with six secondary branches regulated by primary voltage. Each of the six secondary outputs feeds a resistive load (which corresponds to one of the six sectors of the cathode). The six loads are star connected with the star centre grounded. Vin: 380 VAC; ±10%, three-phase Vout: 6 independent outputs 25 Vrms, phased by 60° Iout max per secondary branch (at the same time on all outputs): 1.67 kA (rms) Load: Resistive, star connection, six phases Voltage rise/descent time: 1 - 30 sec Pulse duration: 2 sec, 5 min minimum repetition time. 4 FPN/ FUS - ING DOC. DATE PAG. ING.A.PS.002.S rev.2 19/03/2008 5 Open loop (simultaneous) regulation of amplitude of secondary voltages through continuous regulation of primary voltage (solid state “variac”), following a local or remote reference waveform. The typical waveform is one where voltage is regulated so that the output voltages rise from 0 to Vout in a time interval spanning from 1 to 30 sec with a flat top time of 2 sec. Serve 1 secondo di rise time? Potremmo aumentarlo a 5 o 10?, risparmiamo soldi! Accuracy of output voltage rms: ±2%. Local and remote measurements (optically decoupled) with accuracy ±1%: Vout, Iout (for every secondary branch). Protections: on every secondary branch a max Iout electronic fuse must be installed (with threshold set locally): when it open Vout must vanish in t ~10 msec. Parliamone se serve, io credo di no e si risparmiano soldi. 3. Pinch power supply (PROTO-SPHERA Phase 1) Vin: 20kVAC: ±10%, three-phase Vout: 350 VDC (twelve-phase reaction) Iout: l0 kA (DC) Load: low pressure gas arc discharge with voltage ~150V when arc is formed. Current rise/descent time: < 25 msec (reported to a pure resistive load) Se non diamo l’induttanza come fanno a garantire < 25 msec? Guardate che qui conta anche la lunghezza dei cavi o delle barre che portano i 10 kA. Pulse duration: 2 sec, 5 min minimum repetition time. Accuracy of delivered current (including ripple): ±2% (referred to Iout) Feedback current regulation, through local and remote reference waveform. Local and remote measurements (optically decoupled) with accuracy ±1%: Vout, Iout Protections : 1. Fuses on each high power solid state component and controls on maximum Iout and maximum duration (to be set locally) 2. Statical crow bar / non-linear resistances against overvoltage The external resistance for arc stabilization will be charge of ENEA. The 20kV mains will be charge of ENEA, whereas the need of a noise suppressor filter on the 20kV mains shall be discussed between ENEA and the contracting firm. 5