Download Date - Revision

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