Considerations for Cost Estimating Magnet Power Systems Paul Bellomo
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Transcript of Considerations for Cost Estimating Magnet Power Systems Paul Bellomo
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April 25, 2006 ILC DC Magnet Power Systems 1
Considerations for Cost Estimating
Magnet Power Systems
Paul Bellomo
International Linear Collider
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April 25, 2006 ILC DC Magnet Power Systems 2
DC Magnet Power System Block Diagram
Magnet
DC power cables
Transductors
Power supply
PS controller
Rack and accessories
Global control
Water cooling
AC power interface
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April 25, 2006 ILC DC Magnet Power Systems 3
DC Magnet Information
• Maximum, typical, minimum currents, unipolar or bipolar
• Voltage or resistance (0.1 ≤ V/I ≤ 2
• Series connected (for lower cost) or individual (for insertion or optics)
• Stability - short term (ppm RMS vs. time) and long term (ppm / OC)
• Protection (none, thermal or flow switch, etc), individual / group turnoff
• Special protection and terminations for superconducting magnets
• Mutual coupling with other coils or magnets
• Inductance (for tuning, v=di / dt)
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April 25, 2006 ILC DC Magnet Power Systems 4
Pulsed Magnet Information
• Maximum, typical, minimum currents, unipolar or bipolar
• Impedance and inductance
• Pulse shape (rise and fall times, width) and flattop requirements
• Pulse repetition rate (establishes average power)
• Timing requirements
• Pulse-to-pulse time (jitter) and amplitude stability
• Protection (none, thermal switch, flow switch, etc)
• Special terminations
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April 25, 2006 ILC DC Magnet Power Systems 5
Cables, Raceways and Cable Trays
• Ampacity per NEC or other standard
• Allowable losses (5% ≤ Pc / Pm ≤ 50%) or other heat loading constraints
B = N I / L and P = I2 R = L /D2
Linear reductions in I yield second order reductions in power
• Space for raceways / trays, raceway and tray fill per NEC or other AHJ
• Conventional or water cooled
• Seismic requirements, loading and supports per NEMA VE-1
• Low smoke non-Halogen
• Voltage class or rating
• Shielded, paired or twisted to minimize radiated EMI
• Impedance to match load
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April 25, 2006 ILC DC Magnet Power Systems 6
DC System Zero Flux Current Transductors
Danfysik Model 866
0 - ± 600 A
0.3 ppm / O C
DC – 100 kHz
10 kA / mS
Danfysik Model 860
0-±1000A, to ±3000A
0.3 ppm / O C
DC – 100 kHz
10 kA / mS
Hitec (in Europe)
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April 25, 2006 ILC DC Magnet Power Systems 7
Power Output Vs Mounting / Input Voltage / Cooling Considerations
Input AC (V) Cabinet Cooling
Power Output1 120
3 208
3 480
3 4160 RM FS AC WC
< 2 kW X X X
2 kW 5 kW X X X
> 5 kW 40 kW X X X
> 40 kW 100 kW
X X X
> 100 kW 1 MW
X X X X
> 1 MW X X X X
RM = Rack mounted FS = Freestanding
AC = Air-cooled WC = Water-cooled
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April 25, 2006 ILC DC Magnet Power Systems 8
• Unipolar, bipolar or four-quadrant output
• Redundant to increase availability, modular to reduce
number of different types. Some success with ATF2
redundant modular demonstration system
• Personal protection system (PPS) requirement
• Magnet thermal switch interface
• Ambient temperature range
• Allowable heat into ambient
Other Power Supply Considerations
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April 25, 2006 ILC DC Magnet Power Systems 9
DC and Pulsed Power Supply Controller and Global Control
• Redundant or single
• Communication protocol
• Analog or digital communication with power supply
• Embedded or separate
DC - stability
Pulsed – interlock protection
• Programmable logic controller (PLC) based
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April 25, 2006 ILC DC Magnet Power Systems 10
Racks and Freestanding Power Supplies
• Seismic criteria
• Size (H * W * D) and weight limitations
• Cooling (air or water), air conditioning
• Other environmental considerations
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April 25, 2006 ILC DC Magnet Power Systems 11
AC Power Interface - Last Slide
•Voltage class
•System impedance
•Fault current levels
•Minimize arc flash hazard (recessed breakers, extender
handles, remote control)