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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. - PowerPoint PPT Presentation
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Daniel Egede Rasmussen TE-MPE-PE 1
PSpice modelling of the RQTF circuits
Thanks toArjan Verweij & Emmanuele Ravaioli
19/07/2012
TE-MPE Technical Meeting 19-07-2012
Daniel Egede Rasmussen TE-MPE-PE 2
The RQTF circuit
19/07/2012
𝐼𝐷𝐶𝐶𝑇 ≠ 𝐼𝑚𝑎𝑔𝑛𝑒𝑡 𝑉𝑚𝑎𝑔𝑛𝑒𝑡≠ 𝐿𝑑 𝐼𝐷𝐶𝐶𝑇𝑑𝑡
LHC600A-10VMQT
Daniel Egede Rasmussen TE-MPE-PE 3
Electrical model in PSpice
19/07/2012
Power converter Thyristor
Magnet
R//
Switch
REE
Daniel Egede Rasmussen TE-MPE-PE 4
Thermal analogy in PSpice
19/07/2012
By E. Ravaioli
Daniel Egede Rasmussen TE-MPE-PE 5
Verification
19/07/2012
I ADCCT
I A simulatedDCCT
Event of 15th of April 2008 – 20h01
Curr
ent [
A]
Time [sec]
Daniel Egede Rasmussen TE-MPE-PE 6
Magnet current
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Curr
ent [
A]
Time [sec]
Daniel Egede Rasmussen TE-MPE-PE 7
Energy dissipation
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Circuit component
Event 080415-200144 400A 1 MQT QuenchingEnergy[kJ] Energy[%] Energy[%] Energy[%]
Total 35.5 100 100 100R// 2.8 8 8.6 32.1
Magnets 25.7 72.3 69.4 12.4REE 6.3 17.6 19.8 50.5
Rcrowbar 0.6 1.6 1.8 3.9
Daniel Egede Rasmussen TE-MPE-PE 8
Temperature
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48.1K
Time [sec]
Tem
pera
ture
[K]
400A 1 MQT quenchin
g
38.6K 52.3K
Daniel Egede Rasmussen TE-MPE-PE 9
Failure modes
1. 1 of the 8 parallel resistances turns into an open circuit.2. The switch parallel to the energy extraction resistor fails to
open.3. A combination of the two above
19/07/2012
Daniel Egede Rasmussen TE-MPE-PE 10
R// open circuit
19/07/2012
Curr
ent [
A]
Time [sec]
Daniel Egede Rasmussen TE-MPE-PE 11
R// open circuit
Circuit component Energy [kJ] Temperature [K]
Magnet with open R// 1.2 34.1
Max of other magnets in circuit 3.6 49.5
19/07/2012
Tem
pera
ture
[K]
Daniel Egede Rasmussen TE-MPE-PE 12
R// open circuit
19/07/2012
𝜏𝑛𝑜𝑚=𝐿
1𝑅 ∕ ∕
1𝑅𝑐𝑖𝑟
𝜏𝑜𝑝𝑒𝑛=𝐿𝑅𝑐𝑖𝑟
Daniel Egede Rasmussen TE-MPE-PE 13
R// open circuit
19/07/2012
Daniel Egede Rasmussen TE-MPE-PE 14
Energy extraction failure
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Daniel Egede Rasmussen TE-MPE-PE 15
Energy extraction failure
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Circuit part
Normal operation
Switch failure8 magnets
Switch failure1 magnet
Energy[%]
Temp[K]
Energy[%]
Temp[K]
Energy[%]
Temp[K]
R// 8 - 1.7 - 52.3 -Magnets 72.3 48.1 96.6 51.9 26.4 68.8
REE 17.6 - 0 - 0 -Rcrowbar 1.6 - 2.7 - 17.9 -
Daniel Egede Rasmussen TE-MPE-PE 16
Combination failure
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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.
19/07/2012
Daniel Egede Rasmussen TE-MPE-PE 1819/07/2012
Thank you for your attention
