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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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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
Trip of RB.45 on 7/04

QPS trip at 2349 A during ramping up (precycle)

trip of rb 45 on 7 041
Trip of RB.45 on 7/04

Signals from CL3 CL4. CL 4 signals (board A vs B) are abnormal

what was swapped
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

could there be more u hts or u res signals with crossed wires
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.
fill 1670
Fill 1670

Board A

Board B

Example of a healthy channel: both boards move in unison during a ramp

fill 1670 u res of dflas 7l5 ld3 4
Fill 1670 – U_RES of DFLAS.7L5.LD3&4

LD3 is normal; however, LD4 board B is flat, indicating a problem

analysis of all main circuit u res and u hts
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…