ࡱ> MOLs jbjb Ukk] + d f f f f f f , " /Zd ""d N 0 ,d 1U:\  13-001108-CLN-01 TO: DISTRIBUTION FROM: C NEUMEYER SUBJECT: TF AS-BUILT CIRCUIT PARAMETERS Reference: [1] NSTX-CALC-13-2, TF Coil Parameters [2] NSTX-CALC-13-15, Water Cooled Flex Cable Thermal/Hydraulic Calculation [3] NSTX-CALC-13-18, TF As-Built Circuit Parameters This memo (which is also filed in the ref. [3] calculation with supporting documents) provides a reference for the as-built TF circuit parameters. Equivalent circuit is shown below.  Resistance values are derived in the following spreadsheet. ElementNameDataValueReferenceInner LegsRcinner4.680m&!CalculatedOuter LegsRcouter1.090m&!CalculatedJoints, Flags, Flexs etc. Rcmisc0.486m&!CalculatedSubtotalRcoil6.256m&!CalculatedFlex Cable, Bus Bar, etc.Rflex-bus0.100m&!CalculatedSubtotal6.356m&!Transition Area to Test CellRta-ntc0.610m&!MeasuredSDS to Transition AreaRsds-ta=2*(0.304+0.292+0.285+0.28+0.298+0.287+0.279+0.279)/80.576m&!Average of MeasurementsNominal Subtotal7.542m&!Test Shot Data: R=V/I=400/530507.540m&!Derived from Shot DataDelta-0.002m&!Delta-0.024%Vps open circuitVoc1012.850VoltBasic RatingTest Shot Data: R=(Voc-V)/I=(Voc-777)/504.717m&!Requivalent per branch18.868m&!Power Supply Branch Inc'l ClrRps-sds+Rclr=(2.47+2.44+3.3+2.91)/42.780m&!Average of MeasurementsIps*f/6013541.667Power Supply RequivalentRpsequiv16.056m&!CalculatedNominal Subtotal18.836m&!Actual Subtotal18.868m&!Derived from Shot DataDelta0.032m&!Delta0.171%2P "R16.974m&!4P "R12.257m&!2P "Resistance-Rinnerlegs-CLRs-RPSS3.766m&!4P "Resistance-Rinnerlegs-CLRs-RPSS3.313m&!  The following points are noted: Coil resistance calculations are from ref. [1] and are consistent with the measurements made during commissioning by J. Chrzanowski (total 6.31m&! at coil terminals vs. 6.26m&!calculated). Resistance values are at 20oC. Coil inner leg resistance varies considerably during a pulse. Water cooled flex cable resistances were calculated in ref. [2] at 90&!. Here an additional 10&! is added for the air cooled copper bus run. The combined total resistance estimate, up to the SDS cabinets, where the voltage measurements are made, agrees very well with R = V/I where V is the measured flat top voltage during a 4.5kG test shot. Using curve fit data developed by N. Fromm during the TFTR 6T operations the power supply voltage, for 4 sections active on a feeder with a 0.5&! feeder reactor, is: V = 1012.85-0.018818*I +2.4386e-7*I ^2 Where I = I*freq/60 At 65Hz, 50kA/4 parallels the equivalent resistance is of order 16m&!. Using the above power supply equivalent resistance along with other measurements of the resistances on the power supply side of the SDS, the combined total resistance estimate, down to the SDS cabinets, where the voltage measurements are made, agrees very well with R=(Voc-V)/I, where Voc is the power supply open circuit voltage, V is the measured voltage just prior to flat top when the power supply is fully on (a=0o) and I=50kA, during a test shot. Total effective resistances are indicated in the table for the case of 2 and 4 parallel TF operation. The data entered in the PSRTC for external circuit resistance (ECR) excludes that resistance associated with the coil inner legs, the power supply equivalent resistance, and the CLRs. Therefore the last set of values indicated in the table are the appropriate PSRTC entries for the 2 and 4 parallel cases. Stray inductance is attributable to the cable run. 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