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PF Coils Quench Protection Design of EAST Superconducting Tokamak Oct. 5, 2005

EAST. ASIPP. PF Coils Quench Protection Design of EAST Superconducting Tokamak Oct. 5, 2005 PF power supply team Institute of Plasma Physics,Chinese Academy of Sciences Hefei Anhui 230031 P.R.China. ASIPP. PF Coil Distribution.

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PF Coils Quench Protection Design of EAST Superconducting Tokamak Oct. 5, 2005

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  1. EAST ASIPP PF Coils Quench Protection Design of EAST Superconducting Tokamak Oct. 5, 2005 PF power supply team Institute of Plasma Physics,Chinese Academy of Sciences Hefei Anhui 230031 P.R.China

  2. ASIPP PF Coil Distribution The whole EAST PF magnet system consists of 14 coils, among them PF1 to PF6 are the CS coils, PF7 to PF10 are the diverter coils, and PF11 to PF14 are the PF big coils. They located symmetrically around the equatorial plane

  3. ASIPP PF Coil current in EAST operation

  4. ASIPP The connection between PF coils and PFPS The PF system consists of 14 upper and lower SC coils around the plasma in the EAST tokamak, due to the series connection in diverter, 12 set of PFPS is essential.

  5. ASIPP Parameter for PF Magnet and Plasma Operation

  6. ASIPP Tab. 1 EAST PF magnet parameters PF Coil Parameters and Requirements

  7. ASIPP The power supply circuit of EAST PF coil

  8. ASIPP The requirements of quench protection ★to discharge the magnets in such a way that is less than a prescribed limit under all conditions; ★to limit the maximum instantaneous voltages imposed on the magnet (terminal to terminal, and terminal to ground); ★ to ensure successful discharge with a prescribed reliability for a given number of events over the design lifetime.

  9. ASIPP QP Feature for PF Coil ★ Frequent switching off.the high current rate, and plasma disruption in operation, The PF coil has possibly more quench, ★ strong coupling.The 12 pairs of coil have strong decoupling in each other, in QP the coil energy dissipation will be different from single coil. ★Positive and negative current.in PF coil,it is important for QP design to use artificial current zero technology ★High power in input power supply. In PF magnet system, the primary power supply usually is quite high voltage, therefore it is necessary to suppress the input power supply in QP

  10. ASIPP PF Coil Storage Energy

  11. ASIPP PF Coil Storage Energy for Each energy

  12. ASIPP 不同运行方式下各线圈最大储能 （MJ）

  13. ASIPP QP System configuration The QP consists of bypass, DCCB, PB,fuse, resistor

  14. ASIPP QP Operation Scenario ★Bypass primary PS. Upon command, the quench protection system will suppress the power supply, close the bypass CU3. ★Open DCCB.open the DCCB1, after 100ms, and open DCB2. ★Open PB. If the current detected by sensor DCCT after 200ms is not zero, the pyrobreaker PB will open. ★Fuse melt, and Energy is dissipated in R . The current flowing through the magnet then follows the circuit through CU3, R and L, and the majority of the energy is deposited in R.

  15. ASIPP DC Current Breaker

  16. ASIPP Current and voltage curve for DCCB test B– breaker current ; C– arc voltage

  17. ASIPP Backup Breaker--PB

  18. ASIPP Discharge Resister and Fuse The QP in each power supply will work during the quench of any PF coil. Therefore the PF QP system consists of 12 R-L branches that have magnetic coupling, the total maximum energy Emax stored in all coils should be dissipated in these resistor R of each QP. In R design it is necessary to consider whole energy transfer and max. energy storage in each PF coil and different operation time

  19. ASIPP Fuse Pay attention: ★ at high current, melt rapidly ★ at low current, melt longer ★ shunt current from parallel switch ★Suitable fuse parameter match with SC magnet heat condition. ★two diodes in opposite parallel are in series with fuse

  20. ASIPP Coil Current in Quench protection 5s /elongation

  21. ASIPP Coil energy in Quench protection 5s /elongation

  22. ASIPP I2t in Quench protection 5s /elongation

  23. ASIPP Control Unit for QP QP controllers consist of two parts: one is hardware controller realized by electronic circuit and relay; others is software controller realized by realtime operation system and industrial computers. Up commands …

  24. ASIPP Parts of PF power supply equipment (7)

  25. ASIPP The end Thanks

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