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ELQA

PNO2 analysis tool and NCs

Giorgio D’Angelo

Which circuits?• Type?• Schematic• Ref. doc for HWC

Checkpoints?• List• Meaning

Typical cases … Conclusion

Highlight on RCBV30.L4B1

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ELQAWhich circuits?

Type?– 60 A circuits, MCB(H/V), 752 circuits in total– 80 / 120 circuits, MCBC, MCBY, IT corr’s, 284 circuits in total– Schematic of the circuit:

– These circuits are protected by Power Converter only (no QPS).– Test procedure and acceptance criteria EDMS : 874724 , 874722,

R_Lead_Pos

MagnetCoil

R_Lead_Neg

R_Cable_Pos

R_Cable_Neg

U_MEAS

U_LEAD_POS

U_LEAD_NEG

U_Mag

· Available signal in FGC, when PM files is created

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ELQAChecked points?

Current cycleSignal name Property Units Usefull to…U_LEAD_POS or NEG Init_Ofs [V] EPC

Post_Ofs [V] EPCFlat_Max [V] MP3

V_MEAS Init_Ofs [V] EPCPost_Ofs [V] EPC

MAGNET_Calc Linit [H] MP3Resistance [Ohm] MP3

R_LEAD_POS or NEG Flat_Avr [Ohm] MP3Flat_Slp [Ohm/s] MP3

R_Lead_Pos

MagnetCoil

R_Lead_Neg

R_Cable_Pos

R_Cable_Neg

U_MEAS

U_LEAD_POS

U_LEAD_NEG

U_Mag

· Available signal in FGC, when PM files is created

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ELQATypical cases…

Analysis passed

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ELQATypical cases…

Analysis failed– Offset out of tolerance Warn EPC, magnet point of view it’s OK

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ELQATypical cases…

Analysis failed– Magnet resistance out of tolerance performance to be checked, needs

investigations…why…?

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ELQATypical cases…

Analysis failed: Magnet resistance out of tolerance – Issues:

• No direct reading of the voltage U_Mag• Poor resolution of power converter ADC’s: were not meant for

analysis.• Static value of Rtot: resistance of DC cables used in the calculation

– Solution:• Access to the UA or tunnel needed to investigate with precise

measurement devices• EPC and ELQA needed

for diagnostic.R_Lead_Pos

MagnetCoil

R_Lead_Neg

R_Cable_Pos

R_Cable_Neg

U_MEAS

U_LEAD_POS

U_LEAD_NEG

U_Mag

· Available signal in FGC, when PM files is created

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ELQATypical cases…

Analysis failed on Lead, very rare…– U_LEAD_Flat_Max or R_LEAD_Flat_Average out of tolerance

malfunctioning of current lead: problem of cooling, check with cryo, need investigations…why…?

– R_LEAD_Flat_Slope out of tolerance malfunctioning of current lead: problem of cooling, check with cryo, need investigations…why?

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ELQAConclusion

Conclusion– Due to the very limited instrumentation of the circuits, the accuracy of the

analysis is strongly affected.– Nevertheless, only a few 60 A circuits(*) did not passed the PNO.a1

analysis (3 out of 752) and in the cases where investigations were performed, only one was finally condemned (RCBH31.R7B1, detected during ELQA campaign 2009 and blocked since then)

– Regarding the 80/120 A circuits, 6(**) out of 284 did not passed the PNO.a1 analysis. They were already “Failed” in the previous HCC campaign.

(*) 60A circuits - Failed test in 2011RBCH31.R7B1: Blocked in 2009RCBV30.L4B1: Failed 3 times, Passed onceRCBV28.R3B1: Passed Neg cycle, Failed Pos.

(**) 80-120A circuits - Failed test in 2011RCBCH10.R4B1 Failed 3 times, Pos Cycle is OK, Neg cycle not OK: 3.2 mOhms > 3.0RCBCH5.L1B2 Failed 2 times, Pos Cycle is OK, Neg cycle not OK: 3.2 mOhms > 3.0RCBCV7.L2B2 Failed 2 times, Pos Cycle is OK, Neg cycle not OK: 3.2 mOhms > 3.0RCBCV8.R4B2 Failed 2 times, Pos Cycle and Neg cycle not OK: 3.2 mOhms > 3.0

RCBYH6.R4B1 Failed 4 times, Pos Cycle and Neg cycle not OK: 10 mOhms > 3.0RCBYV6.R4B2 Failed 4 times, Pos Cycle and Neg cycle not OK: 10 mOhms > 3.0

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ELQARCBV30.L4B1 (1/4)

RCBV30.L4B1: 1st test of 2011– 09.02.2011: Failed: Mag.Res. 15.2 mOhm !!

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ELQARCBV30.L4B1 (2/4)

RCBV30.L4B1: 2nd test of 2011– 12.02.2011: Failed: Mag.Res. 16 mOhm !! Linit 5.4 H !! PC changed,

tests to be repeated.

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ELQARCBV30.L4B1 (3/4)

RCBV30.L4B1: 3rd test of 2011– 15.02.2011: test repeated after change of PC, and Passed !!

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ELQARCBV30.L4B1 (4/4)

RCBV30.L4B1: 4th test of 2011– 23.02.2011: Failed: Mag.Res. 13 mOhm !! Linit 5.3 H !!

– Circuit to be investigated…change PC again ??

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ELQA

THANK YOU !!!