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HTS lead protection cross-wiring

HTS lead protection cross-wiring. Friday 8 April 2011 M. Koratzinos , B. Panev , J-P. Tock, R. Denz , K. Dahlerup -Petersen, G. Dangelo. Trip of RB.45 on 7/04. QPS trip at 2349 A during ramping up ( precycle ). Trip of RB.45 on 7/04.

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HTS lead protection cross-wiring

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  1. HTS lead protection cross-wiring Friday 8 April 2011 M. Koratzinos, B. Panev, J-P. Tock, R. Denz, K. Dahlerup-Petersen, G. Dangelo

  2. Trip of RB.45 on 7/04 QPS trip at 2349 A during ramping up (precycle)

  3. Trip of RB.45 on 7/04 Signals from CL3 CL4. CL 4 signals (board A vs B) are abnormal

  4. Simplified schematic…

  5. What was swapped…? • What was found swapped in RB.A45, Lead#2 on DFBAI (L5)? EE22 (pin 15) and EE42(pin16) of cable between PE and QPS controller

  6. Signal meaning…

  7. Could there be more U_HTS or U_RES signals with crossed wires? • A recent improvement for this year, makes the search possible by looking into TIMBER data • We can answer the question by looking at existing rampdata.

  8. Fill 1670 Board A Board B Example of a healthy channel: both boards move in unison during a ramp

  9. Fill 1670 – U_RES of DFLAS.7L5.LD3&4 LD3 is normal; however, LD4 board B is flat, indicating a problem

  10. Analysis of all main circuit U_RES and U_HTS • Looking at all U_RES and U_HTS data it appears that the only abnormal signal is DFLAS.7L5.LD4, board B • We need to also check all IT and IPQs: unfortunately, we do not have the interleaved feature of board A / board B, so we can check only board A (the default) from old ramps and we need a dedicated ramp for board B • This (software) approach is arguably safer than disconnecting cables in the tunnel…

  11. End

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