Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Study on quench detection of the KSTAR CS coil with CDA+MIK compensation of inductive voltages

  • Received : 2016.02.13
  • Accepted : 2016.03.25
  • Published : 2016.03.31
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Abstract

Quench Detection System (QDS) is essential to guarantee the stable operation of the Korea Superconducting Tokamak Advanced Research (KSTAR) Poloidal Field (PF) magnet system because the stored energy in the magnet system is very large. For the fast response, voltage-based QDS has been used. Co-wound voltage sensors and balanced bridge circuits were applied to eliminate the inductive voltages generated during the plasma operation. However, as the inductive voltages are hundreds times higher than the quench detection voltage during the pulse-current operation, Central Difference Averaging (CDA) and MIK, where I and K stand for mutual coupling indexes of different circuits, which is an active cancellation of mutually generated voltages have been suggested and studied. In this paper, the CDA and MIK technique were applied to the KSTAR magnet for PF magnet quench detection. The calculated inductive voltages from the MIK and measured voltages from the CDA circuits were compared to eliminate the inductive voltages at result signals.

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References

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  1. Study on Quench Detection of the KSTAR PF Coils Using Numerical Compensation of Inductive Voltages With Genetic Algorithm vol.27, pp.4, 2017, https://doi.org/10.1109/TASC.2016.2637562
  2. Numerical estimation on balance coefficients of central difference averaging method for quench detection of the KSTAR PF coils vol.18, pp.3, 2016, https://doi.org/10.9714/psac.2016.18.3.025