5 th International Symposium on Negative Ions, Beams and Sources, Oxford, UK Experimental validation of Prototype High Voltage Bushing Sejal Shah , H. Tyagi, D. Sharma, D. Parmar, K. Joshi, A. Yadav, K. Patel, Vishnudev, R. Patel, M. Bandyopadhyay, C. Rotti, A. Chakraborty DNB, ITER-INDIA
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Experimental validation of Prototype High Voltage Bushing
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5th International Symposium on Negative Ions, Beams and Sources, Oxford, UK
Experimental validation of Prototype High Voltage Bushing
Sejal Shah, H. Tyagi, D. Sharma, D. Parmar, K. Joshi, A.
Yadav, K. Patel, Vishnudev, R. Patel, M. Bandyopadhyay,
C. Rotti, A. Chakraborty
DNB, ITER-INDIA
1. DNB HVB & requirement of prototype
2. Design optimization through FEA
3. Manufacturing of non-standard components
4. Assembly and test set up
5. High voltage withstand test results
- Voltage holding test up to 60 kV
- 1 hour withstand test for 50 kV
6. Preliminary results of neutron irradiation
- Activation assessment
- Microstructure analysis
7. Summary and discussion
8. Next steps
Outline
Sejal Shah 25th NIBS , Oxford, UK 12-16th Sept, 2016
DNB HV Bushing
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DNB HV BushingVacuum boundary
HV feedthroughSIC component
DNB High Voltage Bushing (HVB)
• Beam source requirement like electricalbusbars, hydraulic & gas feed lines, RF supplyetc are provided by HV Power supply throughHV Bushing.
• Purpose of HV bushing is to provide isolatinginterface between this 100 kV feedlines andgrounded Vessel
• HV Bushing also forms primary vacuumboundary with ITER Tokamak.
• SIC requirement have been considered whiledesigning DNB HVB.
5th NIBS , Oxford, UK 12-16th Sept, 2016
• Specific requirements for SIC component
• Manufacturing challenges
- Large diameter insulators
- Insulator to metal transitions
- Precise dimension and shapes of electrostatic shields
• Define electric stress limit on different zones
• Hands-on experience of system operation in high voltage and vacuum
environment
Requirement of prototype
Sejal Shah 45th NIBS , Oxford, UK 12-16th Sept, 2016
Scale down of DNB HVB_PHVB
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Operating voltage: 50 kVDC• Same electric stress value as DNB• Cost effective solution : To be
used as feedthrough for TS
Integration with TS
Cross sectional PHVB
5th NIBS , Oxford, UK 12-16th Sept, 2016
Configuration finalization - FE
Analysis
Sejal Shah 65th NIBS , Oxford, UK 12-16th Sept, 2016
g
FE Model data:Number of Elements:220231Number of Nodes: 444678
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Electrostatic analysis
Axis symmetry
V
N
N
A F
V – VacuumA – AluminaN – NitrogenF - FRP
Equivalent FE Mesh
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Interspace flange alteration impact on electric field
Sejal Shah 85th NIBS , Oxford, UK 12-16th Sept, 2016