ts-ssc 90-009 ssc heater energy results 12-apr-1990 … · , l dd26). each file was that of a trip...
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TS-SSC 90-009 SSC HEATER ENERGY RESULTS 12-APR-1990
Seven SSC quench files were analyzed spanning 3 magnets (dd17, dd19 , l dd26). Each file was that of a trip of either Q.D.C.f3 or _Q.D.C.f6 which bypasses the heater delay. All but two trips were Q 2000 amps., the others Q 3000 amps.l 4500 amps.The temperatures spanned 3 .SK to 4.5K.
The time required to quench both outer coils after the strip heaters were fired was determined from the resistive voltages of the quarter coi Is.
Plots were made of (strip heater voltage)**2/(cold heater resistance) . The cold resistance of the strip heaters for dd0017 were not known so a nominal 1.25 ohms was chosen.
A first pass at determining the energy required to quench the outer coils was done by integrating (V•*2)/r from t=O to T, where Tis the time at which both outer coils quenched. The integration was done by estimating the area under the curve so it is not an exact figure .
The following are my results:
Fi let current temp. T(msec) Energy/Htr. Total Energy
000017.Q,8004 1992 amps 4.4K 205 236 Joules 472 Joules 000017.Q.8006 4491 amps 4.4K 98.5 *•290 Joules 580 Joules 000017 .Q.8014 1992 amps 3.9K 172 440 Joules 880 Joules
000019 . Q.8161 1997 amps 3.9 160 480 Joules 960 Joules
000026.Q.8003 2928 amps 3.5K 125 577 Joules 1154 Joules 000026.Q.8013 1969 amps 4.5K 180 244 Joules 488 Joules 000026.Q.8033 2000 amps 4.0K 165 393 Joules 786 Joules
**There seems to be an inconsistancy beween dd0017.qb004 l 006 since it took more energy to quench the outer coils at a higher current . This may be explained in part due to increasing the supply voltage by 25 V after the 004 trip to make T(200 msec .
Strip Heater Voltages: These are the voltages measured accross each strip Htr.
Fi le f Voltage Temp.
000017.Q.8004 86 4 .4K 000017.Q8006 95 4.4K 000017.Q.8014 112 3.9K
000019 .Q.8161 111 3.9K
OD0026 .QB003 125 3.5K 000026.Q.8013 86 4.SK 000026.Q.8033 105 4.0K
DARRYL ORRIS
-----~ ---·· · . ...... .
SSC STRIP HEATER VOLTAGES 10-APRIL-1990
HEATER FIRING CIRCUIT:
The SSC strip heater firing circuit is made up "12" 2400uf 450V capacitors wired in parallel (28.8 mfd).
SETTING HEATER VOLTAGE:
When preparing to test an SSC magnet the heater voltage is set to a value that will quench the magnet in a time sufficient to maintain the conductor temperature below a specified value (dd0018 outer coi Is were lim ited to SOOK) during worst case conditions, ie. a quench around 5000 amps.
The heater voltage is normally set by tripping the magnet at 2000 amps with a zero heater delay and check i ng that both outer coils quench (200 msec . The heater voltage would be incremented by 50 volts until this condit ion is reached with a maximum limit of 450 volts.
TYPICAL HEATER VOLTAGES.
Magnet Temp. Htr .V. S.H. V.
dd0019 3 .5K 350 ? dd0019 3.9K 325 110 dd0019 4.3K 310 100
dd0026 3.SK 360 125 dd0026 4.0K 310 105 dd0026 4.5K 310 100
dd0017 3.9K 325 110 dd0017 4.5K 285 95
NOTE: The strip heater voltages (S.H.) were measured using voltage taps at the ends of the strip heaters. The voltages were then read out by a LeCroy data logger .
DARRYL ORRIS
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STRIP HEATER RESISTANCE 08-NOV-89
ROOM TEMPERATURE RESISTANCE:
STAND I MAGNET S.H.f 2-WIRE DATE 4-WIRE DATE DIFF.
5 000016 1 3.73 23-JAN-89 2.79 23-JAN-89 .94 5 000016 4 3.66 23-JAN-89 2.71 23-JAN-89 .95
4 000017 2 3.32 12-JAN-89 2.98 18-FEB-89 .34 4 DD0017 3 3.00 12-JAN-89 2.68 18-FEB-89 .32
4 000017 2 2.98 Ol-MAR-89 4 000017 3 2.68 Ol-MAR-89
5 000018 2 3.49 8-APR-89 2.62 8-APR-89 .87 5 000018 3 3.56 8-APR-89 2.66 8-APR-89 .90
5 000019 2 4.0 28-AUG-89 3.17 28-AUG-89 .8 5 000019 3 3.9 28-AUG-89 3.10 28-AUG-89 .8
5 000019 2 3.7? 30-AUG-89 3.17 30-AUG-89 .5 5 000019 3 3.9 30-AUG-89 3.09 30-AUG-89 .8
4 000026 1 3.31 09-SEPT-89 4 000026 4 3.29 09-SEPT-89
4 000026 2 3.31 09-SEPT-89 3.049 17-0CT-89 .26 4 000026 3 3.27 09-SEPT-89 3.030 17-0CT-89 .24
COLD (4.SK) RESISTANCE:
STAND f MAGNET S.H.f 2-WIRE DATE 4-WIRE DATE DIFF.
5 000019 l 1.70 28-0CT-89 5 DD0019 4 1.80 28-0CT-89
5 000019 2 1.73 28-0CT-89 1.265 28-0CT-89 .46 5 000019 3 1.80 28-0CT-89 1.240 28-0CT-89 .56
4 DD0026 1 1.73 08-NOV-89 4 000026 4 1.69 08-NOV-89
4 000026 2 1.63 08-NOV-89 1.259 08-NOV-89 .37 4 000026 3 1.59 08-NOV-89 1.202 08-NOV-89 .39
NOTE: All measurements are made at the test stand. DARRYL ORRIS
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