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PSpice modelling of the RQTF circuits

TE-MPE Technical Meeting 19-07-2012. PSpice modelling of the RQTF circuits. Thanks to Arjan Verweij & Emmanuele Ravaioli. The RQTF circuit. MQT. LHC600A-10V. Electrical model in PSpice. Magnet. Power converter. Thyristor. R//. R EE. Switch. Thermal analogy in PSpice.

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PSpice modelling of the RQTF circuits

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  1. TE-MPE Technical Meeting 19-07-2012 PSpice modelling of the RQTF circuits Thanks to Arjan Verweij & Emmanuele Ravaioli Daniel Egede Rasmussen TE-MPE-PE

  2. The RQTF circuit MQT LHC600A-10V Daniel Egede Rasmussen TE-MPE-PE

  3. Electrical model in PSpice Magnet Power converter Thyristor R// REE Switch Daniel Egede Rasmussen TE-MPE-PE

  4. Thermal analogy in PSpice By E. Ravaioli Daniel Egede Rasmussen TE-MPE-PE

  5. Verification Event of 15th of April 2008 – 20h01 Current [A] I A simulated DCCT I A DCCT Time [sec] Daniel Egede Rasmussen TE-MPE-PE

  6. Magnet current Current [A] Time [sec] Daniel Egede Rasmussen TE-MPE-PE

  7. Energy dissipation Daniel Egede Rasmussen TE-MPE-PE

  8. Temperature 48.1K Temperature [K] Time [sec] Daniel Egede Rasmussen TE-MPE-PE

  9. Failure modes • 1 of the 8 parallel resistances turns into an open circuit. • The switch parallel to the energy extraction resistor fails to open. • A combination of the two above Daniel Egede Rasmussen TE-MPE-PE

  10. R// open circuit Current [A] Time [sec] Daniel Egede Rasmussen TE-MPE-PE

  11. R// open circuit Temperature[K] Daniel Egede Rasmussen TE-MPE-PE

  12. R// open circuit Daniel Egede Rasmussen TE-MPE-PE

  13. R// open circuit Daniel Egede Rasmussen TE-MPE-PE

  14. Energy extraction failure Daniel Egede Rasmussen TE-MPE-PE

  15. Energy extraction failure Daniel Egede Rasmussen TE-MPE-PE

  16. Combination failure Quench 57.6% of the energy 95K @ 535A Daniel Egede Rasmussen TE-MPE-PE

  17. Conclusions • PSpice is a powerful tool for analysing circuit behaviour and failure cases. • Preliminary studies of possible improvements. • Care must be taken when fitting. • Models should be verified with data from several events at different currents. • A library of models is needed for post mortem analysis. Daniel Egede Rasmussen TE-MPE-PE

  18. Thank you for your attention Daniel Egede Rasmussen TE-MPE-PE

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