recent cross-wiring issue and implication for circuits protection bozhidar panev te-mpe-cp...
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![Page 1: Recent cross-wiring issue and implication for circuits protection Bozhidar Panev TE-MPE-CP 14.04.2011](https://reader035.vdocuments.us/reader035/viewer/2022062805/5697c02b1a28abf838cd89aa/html5/thumbnails/1.jpg)
Recent cross-wiring issue and implication
for circuits protection
Bozhidar Panev TE-MPE-CP 14.04.2011
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Short chronology of the event from 07.04.2011 • FPA during pre-cycle on RB.A45 at 07:12:09.270
• Energy was extracted without problems. Current in main circuit – 2349A
• The origin of the trip was found:– DQQDC board_A detected: U_HTS = 3mV and open the
quench loop. U_RES in the same moment was ~20mV (threshold 100mV)
• The new feature recently introduced in main current lead protection units toggles detector boards (every 25s) allowing to record U_HTS and U_RES also for the redundant channel (board_B)
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Short chronology of the event from 07.04.2011 • Unusual behavior has been pointed out between board A
and B in respect of U_HTS.
• Both two boards were checked through QPS Test Mode, simulating a voltage rise on the HTS and/or Resistive part
• Correct performance observed of board A and B
• Analysis of the event’s data and results from Test Mode bring the conclusion of abnormal behavior of U_HTS concerning board_B– Eventual short in the cable or inverted pins (Hypothesis
of Reiner)– Giorgio also assured no errors found between PE and
cold part of leads during ELQA campaign
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U_HTS Signals for CL3 and CL4
A
B
A
BA
B
A
W r o n g b e h a v i o r o f U _ H T Sm e a s u r e d b y b o a r d B
E x c e l l e n t p r f o r m a n c eo f b o a r d _ A ( t h r e s h o l d 3 m V )
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What was wrong?• Intervention in the Tunnel to check the cabling and discover what
was wrong• Cable patch - correct• The Error was found in connector P60 of cable between QPS crate
and Proximity cable patch. Pin 15(EE22) and 16(EE42) were inverted.
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What was measured?
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Verification for correct wiring of 13kA circuits (RB,RQD,RQF)
• Due to the available acquisition data from boards A and B. It became possible to check by TIMBER the rest RB, RQD/F circuits for swapped pins.
• The only what was necessary to be done was take a look and check how U_HTS and U_RES behave during the rump.
U_HTSBoard_A
I_MEASU_HTSBoard_B
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U_HTS Signals for CL3 and CL4 of DFLAS.7L5
• Normal behavior of U_HTS of CL3
• U_HTS stay flat during the rump - indication for problem
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Verification for correct wiring of all IPDs, IPQs and ITs circuits – 08th of April
• A dedicated PNO.a7 which does unbalanced powering was carried out over all IPQs.
• As no automatic swap between boards. The test has been done twice. Once at board_A and second at board_B.
• For IPDs and ITs a manual rump was done.
• Difficulties that were found:– When tried to switch to board_B, some B_board did
not give power permit (13 circuits). It has required a local power-cycle.
– The analysis of U_HTS signals
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Criteria for correct wiring of IPQs, IPDs and ITs
• Resistive part of leads during asymmetric powering of RQ.8R1
• HTS part of leads during asymmetric powering of RQ.8R1
• Verification of U_RES and U_HTS for all IPDs, IPQS, ITs– Done for board A and B
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Conclusion 8th of April
• On Thu 7th of April all 13kA circuits were checked for correct wiring.
• On Fri 8th April all IPDs, IPQs, ITs also pased verification.
• 600A were not checked because its were checked by QPS team before with a correct procedure and dedicated tester – all tests are documented
• Green light for powering has been given
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