BEGIN NEW DATA CASE C BENCHMARK DC-32 C Artificial 6-pulse dc power supply that illustrates the simulation of C diodes. It was concocted in July of 1977 to instruct Hughes Aircraft in C Fullerton, California (Emory Johnson, Gene Perusse, and assoc.). Use of C MEMSAV = 1 dumps tables for later restarting and modification (see DC-49). C It is assumed that STARTUP has KTRPL4 < 0 and L4BYTE = 1 so that a C C-like ".PL4" file having name DC32.PL4 will be created (used by DC-49). PRINTED NUMBER WIDTH, 12, 2, { Request maximum precision (for 8 output columns) .000020 .010 1 1 1 1 1 -1 1 2 5 5 10 10 50 50 C Three 2-winding saturable transformers having unity turns ratios are C delta-connected on the source side, and grounded-Y on the rectifier C side. The magnetizing branch is both nonlinear and lossy: TRANSFORMER .01 .05TRANA 1.E5 1 .01 .05 .02 .06 .05 .07 .15 .08 9999 1GENA GENB .06 .01 115. 2SECA .06 .01 115. TRANSFORMER TRANA TRANB 1 1GENB GENC 2SECB TRANSFORMER TRANA TRANC 1 1GENC GENA 2SECC C Small impedance branches are used (prior to "M34." generalized switch C logic) to isolate switches from each other at "POLEA". R = 5 ohms. C Although in theory such isolation is no longer required, do not try C to remove these 9 resistors, since they provide necessary damping. C Note that these resistors are not of negligible value: CATH1 POLEA 5.0 CATH2 POLEA CATH1 POLEA CATH3 POLEA CATH1 POLEA C More small impedances used for switch isolation at node "POLEB", and C also at the transformer secondary. Half the value of "POLEA" is used, C for balance: CATH4 SECC 2.5 CATH5 SECA CATH4 SECC CATH6 SECB CATH4 SECC AN4 POLEB CATH4 SECC AN5 POLEB CATH4 SECC AN6 POLEB CATH4 SECC C 2-conductor distributed line connects "POLE" with "LOAD". Inductance C parameters are 5.8 and 1.6 millihenries for the ground and sky modes, C respectively. Length is five miles. Values are typical for 500 kV line: -1POLEA LOADA 0.3 5.8 .012 5.0 -2POLEB LOADB .03 1.6 .019 5.0 C Large stray capacitance ties the dc side to ground: POLEA 100. POLEB POLEA C Load on dc side is parallel 200 ohm R and 100 microfarad capacitance: LOADA LOADB 200. LOADA LOADB 100. C One-ohm grounding resistance, for later fault (see DC-49 continuation). LOADA FAULT 1.0 C 20 August 1998, discovery that Pi-circuits are mishandled leads to addition C of the following radial branch off the generator (does not change answers): 1GENA 1-A 34.372457.68.15781 2GENB 1-B 35.735164.43-.031538.002451.79.16587 3GENC 1-C 35.735164.43-.031537.455151.72-.021938.002451.79.16587 BLANK card ending all branch cards C First switch is to be the fault switch (open here, and closed in DC-49): FAULT 1.0 2.0 C Bridge circuit consisting of 6 uncontrolled valves (i.e., diodes). Those C numbered 1, 2, and 3 feed "POLEA", making it positive with respect to C ground. Diodes 4, 5, and 6 feed "POLEB", making it negative. 11SECB CATH1 13 11SECA CATH2 CLOSED 13 C The following card serves to name the switch following it. To see the C results of this activity, interactively execute the "SWITCH" command of C SPY, sending "EXTRA" for the alternative table. Another point: note C the exclamation point, which is needed to hold lower case within A6 name C (assuming KINSEN = 1 within STARTUP). No such control for valve six. NAME: Valve3 ! { Request "NAME: " of cols. 3-8 precedes A6 valve name in 9-14 11SECC CATH3 13 11AN4 CATH4 CLOSED 13 11AN5 CATH5 13 NAME: Valve6 { Request "NAME: " of columns 3-8 precedes A6 valve name in 9-14 11AN6 CATH6 CLOSED 13 BLANK card terminating the last switch card C Balanced 3-phase source of 400 Hz is connected to transformer delta side: 14GENA 93.897 400. -30. -1. 14GENB 93.897 400. -150. -1. 14GENC 93.897 400. 90. -1. BLANK card ending all source cards 1 { Request for all node voltage outputs PRINTER PLOT 144 1. 0.0 10. LOADA LOADB { Axis limits: (-1.637, 1.618) $WIDTH, 79, { Narrow output width will save paper from here on (summary stats) BLANK card ending the last plot cards BEGIN NEW DATA CASE BLANK