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NCSX. Operation of the C1 Modular Coil in the Coil Test Facility Peer Review. June1, 2006. The objectives of this review are to consider: Installation of the C1 in the CTF Instrumentation and Data Acquisition Test Plan. C1 Operation Review Objective. Close Quarters. - PowerPoint PPT Presentation
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June 1,2006 2
NCSX
C1 Operation Review Objective
• The objectives of this review are to consider:
– Installation of the C1 in the CTF
– Instrumentation and Data Acquisition
– Test Plan
June 1,2006 4
NCSXES&H Changes
• Magnetic field exposure for personnel is slightly higher for the C1 test. The barrier distance increases from 15 feet to 23 feet.
• The C1 cryostat is large enough to impede access to and egress from the test enclosure. Three access doors allow entrance to the enclosure with necessary procedure changes (RLM: von Halle).– May become classified as a Confined Space
June 1,2006 5
NCSX
C1 Installation
• 304 stainless steel legs (SE144-030)for strength– One leg fixed in
X&Y, three on roller supports
• EM loads on baseplate for boil-off reservoir require tie-downs
June 1,2006 6
NCSXCoil Flow Diagram
The C1 Coil Has Been Plumbed As 9 Separate Single-Phase Flow Paths
and
One Two-Phase Supply For The Lead Block Bleeds
June 1,2006 7
NCSXThe Plumbing B-Plan
• Teflon tubing with Swagelok joints and custom backing inserts were not reliable– 40 psig was the best pressure achieved– The previous style of insulating G-10 pipe
nipples will be used in the plumbing
June 1,2006 8
NCSXBus Conductor
500 MCM Welding Cable Insulated with Teflon FEP Shrink Tubing Has Successfully Been Tested to 58 kV
June 1,2006 9
NCSXBus Bracing
A Robust Support Has Been Fabricated To Both Partially Relieve The Leads From Load And To React Bus-Bus Forces
Clamping force of 11300 N/m or 65 lbf/in is required on close conductors
D. Williamson has asserted that the coil leads are not particularly fragile
June 1,2006 10
NCSXLead Insulation
• Maximum voltage across coil is expected to be approximately 499 volts – The G11CR lead sleeves designed and
machined for the production coils are being used for this test set-up
June 1,2006 18
NCSXTest Objectives
• Main purpose – calibrate FE models with actual data– Improves confidence with which models can
be used for future what-if inquiries.
• Secondary purpose – assess cooldown/recovery performance from ambient temperature and after pulses
June 1,2006 19
NCSXDimensional/Deflection Measurements
• 3 measurement approaches
– Extensive strain gauge array
– Mechanical displacement measurement
– Manual measurement of total width of both winding packs before and after
June 1,2006 20
NCSXStrain Gauge Locations
• 15 of K. Freudenberg’s 20 requested locations are instrumented
June 1,2006 21
NCSXMechanical Measurement
Box Dimensions are 94” X 116.5” ID with wall thickness of 6”
Three tubes needed
1. 9.5 foot outer tube ss tube, .875 OD, .675” ID. (purchased)
2. 8 inch ss tube (box entrance) .75” OD, .6875” ID
3. 10 foot inner ss tube ¼ diameter
Three angles needed (2” X 3”) (.1875 thick). These may be from local boat supply store. (Tentatively purchased two anchors.)
June 1,2006 22
NCSXThermal Measurements
• Extensive strain gauge and t/c data collection system
• V/I resistance inference– This is a key feature as it is prototypical of the
first-plasma machine protection scheme– ADMINISTRATIVE control of coil temperature
through resistance value (wait for next pulse until cool)
June 1,2006 23
NCSXTemperature Differentials
• Fiberglass convection insulation will be installed on coil with fiberglass rope
• Only outer aspect of coil will be exposed to cooling
• Two T/C’s will be installed near the winding packs on coolant tubes. The resulting temperatures will be used to monitor the deltaT between the windings and the MCWF.
• A 50C difference has been recommended.
June 1,2006 24
NCSXTest Sequence
– Lift the both ends of the cable bus assembly and megger pole-pole to 3 kV
– Restore the bus at the coil end and megger the warm coil to ground to 7.5 kV
– Completely restore the bus and measure the warm circuit resistance from the rectifier room
– Collect winding pack width data prior to cool-down– Cool the coil to ~80K with proper data collection
June 1,2006 25
NCSXTest Sequence (cont.)
– Measure the cold circuit resistance from the rectifier room
– Perform basic shot sequence with T/C, strain archival and V/I cooldown checks
– Warm up to install mechanical measurement rig– 5 kA room temperature pulse for K.F. – Cool down, repeat shot sequence, collect previous
data plus displacements– Warm up facility– Measure final winding pack dimensions
June 1,2006 26
NCSXCurrent Waveforms for Test
C1 Waveforms
0
5000
10000
15000
20000
25000
30000
35000
40000
-1 -0.5 0 0.5 1 1.5
Time (seconds)
Cu
rren
t (a
mp
eres
)
Series1
Series2
Series3
Series4
The 2T Scenario from the Rev. 4 GRD offers 36.5 kA with
an I**2t of 1.15e9 a**2sec.
June 1,2006 27
NCSXProtective Circuitry
• Protective Settings– Maximum “On” time – 2.3 seconds - no
change from TRC– Tau (thermal) – 200 seconds – no change– Minimum cycle time – 900 seconds – no
change– I**2t max – 1.6e9 a**2sec – no change– Imax – 38.5 kA up from 33 kA