Proposal for threshold changes arjan verweij te mpe
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Proposal for threshold changes Arjan Verweij, TE-MPE. IPQ (6 kA) RQTD/F (600 A) HTS leads (13 kA). Arjan Verweij, MPE-TM meeting, 1 Dec 2011. Problem: Tripping because of pick-up in the long circuits, especially in RQ9 and RQ10. Actual setting: 100 mV, 10 ms Needed:

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Proposal for threshold changes arjan verweij te mpe

Proposal for threshold changesArjan Verweij, TE-MPE

IPQ (6 kA)

RQTD/F (600 A)

HTS leads (13 kA)

Arjan Verweij, MPE-TM meeting, 1 Dec 2011


Problem:

Tripping because of pick-up in the long circuits, especially in RQ9 and RQ10.

Actual setting:

100 mV, 10 ms

Needed:

Factor 2 increase in voltage threshold, or maybe increase in tdiscr.

IPQ

Arjan Verweij, MPE-TM meeting, 1 Dec 2011


Ipq circuits
IPQ: Circuits

  • Calculations and conclusions only hold for the RQ5-RQ10 (consisting of MQM magnets).

  • The RQ4 (consisting of MQY) is not simulated.

  • The circuits RQ5-RQ6 operate at 4.5 K, with about 20% smaller current, and are therefore much safer.

  • No EE

Arjan Verweij, MPE-TM meeting, 1 Dec 2011


Ipq miits
IPQ: MIIts

MIIts dissipation after heater firing is deduced from about 15 quenches in the machine between 2.3 and 5.2 kA on the circuit with the largest inductance (i.e. RQ6 consisting of 2xMQM and 2xMQML).

MIIts are then ‘translated’ into an effective decay time constant, and used along with tdiscr, Dth and Uthr in the code QP3 to calculate hot spot temperatures Thot.

Arjan Verweij, MPE-TM meeting, 1 Dec 2011


Ipq circuit parameters
IPQ: Circuit parameters

Arjan Verweij, MPE-TM meeting, 1 Dec 2011


Ipq quench in magnet changing u thr
IPQ: Quench in magnet, changing Uthr

Conclusion: Fully safe up to 4 kA with 400 mV, 10 ms

Arjan Verweij, MPE-TM meeting, 1 Dec 2011


Ipq quench in magnet changing t discr
IPQ: Quench in magnet, changing tdiscr

Conclusion: Fully safe up to 4 kA with 100 mV, 40 ms

Arjan Verweij, MPE-TM meeting, 1 Dec 2011


Ipq quench in bus
IPQ: Quench in bus

adiabatic

Resistive joint

Conclusion: Fully safe up to nominal current with 400 mV, 10 ms or 100 mV, 100 ms

Arjan Verweij, MPE-TM meeting, 1 Dec 2011


IPQ

Arjan Verweij, MPE-TM meeting, 1 Dec 2011


Rqtd f

  • Problem:

  • Tripping because of tune feed-back with currents of about 50-70 A.

  • Actual setting:

  • I<50 A: 2 V, 190 ms

  • 50 A<I<350 A: 100 mV, 190 ms

  • I>350: to be re-assessed

  • Needed:

  • Increase in voltage threshold for currents up to about 80 A.

  • 2 solutions:

  • - Increase the limit of 50 A to about 80 A.

  • Introduce a 3rd threshold, e.g. 300 mV, 190 ms up to 100 A.

  • If possible, the hot spot temperature during a quench should be kept below 150-200 K

RQTD/F

Arjan Verweij, MPE-TM meeting, 1 Dec 2011


Rqtd f circuit parameters
RQTD/F: Circuit parameters

Arjan Verweij, MPE-TM meeting, 1 Dec 2011


Rqtd f quench in magnet
RQTD/F: Quench in magnet

Arjan Verweij, MPE-TM meeting, 1 Dec 2011


Rqtd f quench in bus
RQTD/F: Quench in bus

Hot spot temperatures at 600 A

Arjan Verweij, MPE-TM meeting, 1 Dec 2011


Rqtd f1
RQTD/F

Conclusion

Both proposed solutions, namely:

A. I<100 A: 2 V, 190 ms

100 A<I<350 A: 100 mV, 190 ms

B. I<50 A: 2 V, 190 ms

50 A<I<200 A: 300 mV, 190 ms

200 A<I<350 A: 100 mV, 190 ms

are fully safe.

For 7 TeV operation (when going above 350) the thresholds for I>350 A has to be re-assessed.

Arjan Verweij, MPE-TM meeting, 1 Dec 2011


13 ka hts leads

Problem:

MSC prefers to detect a quench in the lead in the early flux flow regime, i.e. at the smallest possible voltage.

Actual setting:

3 mV, 100 ms

Request:

1 mV, tdiscr =100 ms.

Needed (in my opinion):

1 mV, tdiscr<several sec

Why do we need a discrimination time of 100 ms if the decay time constant is 100 s?

Status (to my understanding):

We are allowed to use 1 mV, 1 s for a possible CSCM test up to 6.5 kA during the X-mas shutdown. For normal operation next year we should keep our present threshold (3 mV, 100 ms). Amalia will do a test in SM18 in mid 2012 and then give us her green light (or red light) to increase tdiscr.

13 kA HTS leads

Arjan Verweij, MPE-TM meeting, 1 Dec 2011


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