MAC 22, 6. 12. 2007, KHM-AT-MEL, on behalf of the Commissioning Team 1 On behalf of the...
42
MAC 22, 6. 12. 2007, KHM-AT-MEL, on behalf of the Commissioning Team 1 On behalf of the Commissioning Team Commissioning of the Main Circuits And many, many more
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Transcript of MAC 22, 6. 12. 2007, KHM-AT-MEL, on behalf of the Commissioning Team 1 On behalf of the...
MA
C 2
2, 6
. 12
. 20
07,
KH
M-A
T-M
EL,
on
beha
lf of
the
Com
mis
sion
ing
Team
1
On behalf of the Commissioning Team
Commissioning of the Main Circuits
And many, many more
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sion
ing
Team
2
Commissioning of the Main Circuits
Introduction Main Circuits
Defined here as >600A nominal
Complexity
History of events Quench Protection Lessons learned
In the Power Converter talk:
– All Energy extraction tested before and OK
– All Quench Protection installed and tested (but for the true signals)
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3
LHC Overview
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4
LHC Overview
Sector 7-8 , May - June
Sector 4-5 , Nov - Dec
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5
Complexity
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Complexity
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7
Complexity
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8
“Was man schwarz auf weiss besitzt…”
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9
“Was man schwarz auf weiss besitzt…”
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10
Tests of “Main Circuits”
Sector 7-8 (in total ~22 days for >600A circuits)– Test of D2, Q4, Q5 (~14 days)
• A Puzzle to be solved
– Test of QD, QF (~5 days)– Test of MB (~5 days)
Sector 4-5 (in total 3 days and today magnet tests)– Test of Q6
In 24 days 7 main circuits tested, – 3 of which fully tested
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11
The D2 Q4 puzzle
The MS was cold first (4.4 K), hence the test started there D2
– Start @ 15.5
– 6 kA @ 29.5 (after 4 days of testing)
Q4
– Start @ 30.5 close to nominal quench while changing Beam1 circuit
– Improvement of diagnostics.
– Looking into possible links:
• D2 and Q4 share conductors of a cable (non-conformity)
• Likely movement between the two cables, when Q4-B1 is powered
Slow changes and shaking Q4 and D2 Problem disappeared
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12
First Indication of Linkage between D2 & Q4
D2 Spontaneously Quenches as it
approaches Nominal50 mS later Q5 Trips due to QPS
Imbalance500 mS later Q4 Quenches but Why???
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13
D2, Q5, Q4, 13.June 07
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14
D2 History
69507100
7500
6000 6000
5269
1000
350245
200
120
120910
500100015002000250030003500400045005000550060006500700075008000
Cur
rent
BNL testing LHC D2 L8
First magnet to reach nominal (29.5)
The MS was cold first (4.4 K), hence the test started thereStart @ 15.56 kA @ 29.5 (after 4 days of testing)
D2
See later
Courtesy Glyn Kirby
MA
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15A.Ballarino
D2 at 6000 A (~15 hours run)
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16
QPS trip ?
30.5. at nominal (D2 at 0)
Q4, shares the DFBM with the D2
Courtesy Glyn Kirby
MA
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17
Consists of 2 MQM
Q5
Courtesy Glyn Kirby
MA
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18
The D2 Q4 puzzle
The D2 was quenching when the Q4-B1 was at high value
The Quench was likely in the part, where the power busses are in the DFBM “side-by-side”
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The D2 Q4 puzzle
Once the cable where shaken into place, no quench occurred any more
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20
RQ and RB
RQ circuits limited due to high-pot problems
– Chosen was 6500 A max
RB circuit limited by one faulty dipole
– Chosen was 2000 A max
Note that both current levels were conservative. The energy extraction was tested before
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Team
21A.Ballarino
RQD at 6500 A (~15 hours run)
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22
Inductive Discharge Voltage
+1V
Diode Drop -
1.2 Volts
Voltage
going into Coil
Voltage coming out of Coil
Quench Balanc
e Signal (∑) x10
Heaters Fire and
EE Switch Opens Diode
switches ON
at-6 Volts
Diode Performance during 6.5 kA Quench
of Main Quad QD.12R7
Artificial Test Ramp
Up==>
Trip at 100 mV
Quench Driven Polarity Reversa
l
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23
July 4th RB, QF, QD
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24
RQ6.R4, yesterday!!!!
Powered to Nominal 3610 Amps– in Both Apertures
No Spontaneous Quenches No False Quench Detections Lead Provoked Test Quenches
– Symetric & Asymetric
No Problems !
Courtesy Robert Henry Flora
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3610 Amp Quench, Q6.L4 (MQY)
Yes, these are two curves!
Both apertures quench identically!
That is to say: inductance, resistance, heaters and heat conduction are identical!
Courtesy Robert Henry Flora
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26
Half Coil Voltages (resistive +inductive)
B1
B2
100 ms
Courtesy Robert Henry Flora
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27
Quench Discharge Rate
Ampsec
dIdt
Magic button
Change of rate as already visible in
the voltage
Courtesy Robert Henry Flora
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28
Discharge Growth Rate
d2Idt2
Ampsec2
Courtesy Robert Henry Flora
Layer jump??
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29
Asymmetric Quench
B1
B2
Courtesy Robert Henry Flora
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30
Quench Discharge Rate
Amp
secdIdt
B1
B2
Courtesy Robert Henry Flora
MA
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31
Quench Protection
The Quench Protection was requested to run in 7-8 at 5 times lower threshold than design
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0-2.0
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
16.0
U_BB_1
U_B...
t [s]
U_B
B_1
Voltage over the current leads of RQF during a provoked 6.5 kA quench
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32
Quench Protection
The Quench Protection was requested to run at 5 times lower threshold than design
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0-2.0
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
16.0
U_BB_1
U_B...
t [s]
U_B
B_1
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
-0.040
-0.030
-0.020
-0.010
0.000
0.010
0.020
Series1
t [s]
U_B
B_1
No real problem for the main circuits, problems for the corrector circuits
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33
Lessons learned (?)
By now well prepared procedures Highly motivated and well trained people A good team Good software support, displays etc, some minor hick-ups
Circuits without problems are very rapidly tested Several tests possible at the same time
Organization has much improved
Magnets no problem so far Current Leads no problem Energy Extraction no problem (so far) Quench Protection no problem (so far) Bus bars in the DFB can move due to non-conform manufacturing
We need stable testing conditions!
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34
End
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Table 1. List of distribution of busbars in DFBAs with NC in 6kA cablingDFB Sect. IR Cable 1 Cable 2 Cable 3 Cable 4DFBAO 7-8 8L cabling not checked cabling not checked cabling not checked cabling not checkedDFBAA 8-1 1L Q9C Q9A Q7B Q10A Q10B Q10C Q7A Q7C Q8B Q8A Q8B Q9BDFBAP 8-1 8R Q8A Q8C Q10C Q9C Q9B Q8C Q7A Q7B Q9A Q10A Q10B Q7CDFBAH 4-5 4R Q7C Q10B Q9B Q9A Q8B Q9C Q8A Q7A Q8C Q7B Q10A Q10CDFBAI 4-5 5L Q8A Q8B Q10B Q7A Q7C Q8C Q9B Q9C Q7B Q10A Q10C Q9A
Table 3. Distribution of busbars in DFBLs with NCDFB Sect. IR Cable 1 Cable 2 Cable 3 Cable 4DFBLA 8-1 1L D2A D2B Q6A Q6B Q6C nu Q4A Q4B Q4C Q5A Q5B Q5CDFBLB 1-2 1R D2A D2B Q6A Q6B Q6C nu Q4A Q4B Q4C Q5A Q5B Q5CDFBLD 4-5 5R D2A D2B Q6A Q6B Q6C nu Q4A Q4B Q4C Q5A Q5B Q5C
Cable NC
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36
Q4-D2 movements
Displacements from J.P.Quesnel, e-mail 12 Feb.’07
Top view
Side view
Q4
D2
D2
Q4
~10 mm
~7mm~7mrad~0.9 mrad
~10 mm
80 kN80 kN
80 kN 80 kN
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37
Photo Gallery
Tack welded stud
Uprooted longitudinal jack
radial jack at end of free movement Bus bar line with fixed point
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38
Magnet or Bus-”pig-tail”
Magnet Quench
190mV
10 ms
19 V/s
D2 Quench Development5269A
31st May @ 16:07 D2,Q5,Q4 Quench
D2 5280A quench24th May @15:53
Q4 training Quench At Nom 3610A
20 ms
50mV
2.5 V/s16 ms
30mV
1.87 V/s
Q4 Quench Development3128A
Q4 Quench Development3610A
D2 Quench at BNL ~7 V/s from 5274 A
(No R.T. leads and bus)
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39
60 to 80 ms Heater delay
Hea
ters
trig
gere
d
20 mV threshold
10ms verification
D2 quench at 5280A 31st May
2.5 V/s
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40
Q4 B1
Q4 B2
Q4 300A Quench / trip
10ms verification
Hea
ters
20 mV threshold 20 mV threshold10ms verification
Hea
ters
Q5 trip at ~3800A due to threshold imbalance after D2 quench
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41
600A
6000 A
13000 A
20K gas
50K With Current
70K No Current
LIQUID Helium covering LTS !!
Level should be correct in each chimney
4.5K liquid in
HT
S
Nominal Operating conditions for HTS leads
600 A, 6000 A & 13000 A
Ref. LHC-DFL-ES- 0001
1. LHe Level (Section 7.6) – In each chimney, it can vary over a length of 4 cm from the bottom end of the lead. LHe level max = 5 cm measured from the bottom end of the lead.
2. Temperature of cooling gas < 25 K (Section 3.2)
From 70 K to 50 K: 1/2 hour before powering?
Before powering: checks according to EDMS 755782 (The commissioning of the DFBs)
Cry
o st
art
Cry
o-m
aint
ain
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42
6KA D2 Pig-Tail 20mV or 50mV threshold
0.000
0.020
0.040
0.060
0.080
0.100
0.120
0 0.1 0.2 0.3 0.4 0.5 0.6
0
100
200
300
400
500
600
700
Voltage over resistive part
Av Temp Cable 1 T(K)
Current / 10
Pig-tail quench simulation
20mV qps threshold, 70ms heater delay , No cooling!! 2cm length of conductor quenched.
From 6000A
Pig-tail quench simulation50mV qps threashold, No cooling!! 2cm length of conductor quenched.
From 6000A
0.000
0.050
0.100
0.150
0.200
0.250
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
time (s)
Vol
tage
ove
r 2c
m s
ectio
n (V
)
0
100
200
300
400
500
600
700
800
hot s
opt t
emp
& (C
urre
nt /1
0)
Voltage over resistive part
Av Temp Cable 1 T(K)
Current / 10
20 mV 350 K (OK)
70 ms
Too Hot 70 ms
50mV, 70ms heater delay, 6000A, 200mm Pig- Tail
quench
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
0
100
200
300
400
500
600
700
Voltage over resistivepart
Av Temp Cable 1 T(K)
Current / 10
70 ms
