ET Metal Composite Tubular type Non-Inductive Resistors for Ultra High Voltage, High Energy Energy Tube;Carbon Metal Composite,ultra high voltage Resistors . ET series to meet general set of requirements of various ultra high voltage high energy with composite type tubular resistors , especially for build up R & R-C Tank/Bank at reasonalble cost . Power Rating Able to build up Mega Jouls Energy Well working in Air, Oil , Mist & harsh condition Pulse Modulators Surge Absorb Charging /Discharging Nuclear, Nuclear Fusion Dust Collecting Systems High Voltage Rectifyer ,Diode High Frequency R , R-C Bank /Tank Model Nr. Std. Ohmic Rating[ Ω] Low Extended Rvalue[Ω] ET-70 10~250 1.5 ET-150 10~500 2 ET-180 10~500 3 ET-210 10~600 5 Hi Extended Rvalue[Ω] upto 10k upto 20k upto 25k upto 30k DIMENSIONS [mm] Custom R-value available upon request related with q'ty basis Power [W] 1) Energy 2) [J] Max. M a x . Impulse V o l t age 3) [kV] 1.2/50uSec L B D Dia on Corona Ring T ET -70 70 6,790 45 150+/2.5 45+/1.0 35+/0.5 59+/-0.5 M6 ET-70ec 70 6,790 50 183+/2.5 45+/1.0 39.5+/0.5 67+/-0.5 M6 ET-150 150 14,500 100 310+/2.5 45+/1.0 39.5+/0.5 67+/-0.5 M6(M8) ET-180 180 17,120 110 360+/2.5 45+/1.0 39.5+/0.5 67+/-0.5 M6(M8) ET-210 210 22,900 125 410+/2.5 45+/1.0 39.5+/0.5 67+/-0.5 M6(M8) Model Nr. Dimensions in millimeters cation available upon request related with q'ty basis Notes : "1)" cation. "2)" "3)" * ET70-ec : extended cap and corona ring type cation Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, United Kingdom. + 44 (0) 1342 834306 [email protected] http://www.willow.co.uk + 44 (0) 1342 835234 1 ET Metal Composite Tubular type Non-Inductive Resistors for Ultra High Voltage, High Energy Impulse withstand Voltage [kV/Cm] Specific ohmic vs. withstand voltage[1.2/50uSec] co-relations (chart 1) S PECIFICATIONS 10 Standard Resistance of Toelerance: 20% (15% , 10%, 5% if stocked) Rated power and power derated : The rated power working at 40 ˚C . In case of exceed 40 or the individual resistors are on thermal radiation, then the continuous working power must be reduced to 10% ~ 90% of the rated power typ. recommended. Surface temperature control : In case of continuous working condition , the surface temperature shall be controlled,keep 100 ˚C max. An enforced coolant fan or other air coolant must be operate before the resistors working. Water or other chemical fluid what prohibited direct pour in the surface of resistors . Short time operational surface temperature : 250˚C max. for sveral mins. {harsh temperature to broken on just resistives : 8 6 4 0 20 30 50 70 100 200 300 500 700 1k 2k Specific Ohmic Value [Ω-Cm] 500˚C max. for 30min (must be slowly increased for 20mins) but core shaft made of enforced epoxy and bent/out of order from 230˚C } Power derating at continuos loading (chart 2) Corona Ring and Cap : ET-series supplied in the resistors put on standard corona ring and cap basically. The specified standard cap and corona ring system to optimize at 50% of the rated V-peak on ≤1.5/50㎲ pulse. So, in case of higher voltages and longer pulse shapes would better use specific corona ring and cap. Especially for the individual resistors what are less than 20R ,which shall be recommended, to optimized on custom ring and cap /electrods , please talk with 3RLab Engrs. Gap distance of multi conection in parralell and power derate: more than 4ea ,must keep distance between each resistors, because each resistors hit radiation on themselves. gd=1.5 x B ; derate to 60% of rated power gd=2.0 x B ; derate to 70% of rated power gd=2.5 x B ; derate to 80% of rated power Rated Power [%] 100 80 60 40 20 0 25 50 75 100 150 230 Ambient-Temperature (˚C) cf. dg = gap distance of center to center between each resistors B = resistors body diameter Surface temp. rising & power rate (chart 3) Surface Temperature ˚C 250 Temperature Coefficient of Resistance ,TCR : 0.15%/˚C typ. Voltage Coefficient of Resistance ,typ. VCR : 1.5% [kV/Cm] at 2R~ 500R ,, 2.5% [kV/Cm] at 600R~1.5kΩ,, 5% [kV/Cm] at higher than 1.6 kΩ . 200 150 100 Load Life Stability : ΔR5% max. at dissipation(less than 50% of rated max power), ΔR7% at 100% of rated power, for 500h. 50 0 20 40 60 80 The Long Life stabilify (on Load) and power yield is one of very corelated factor . Recommened dissipate electric power/energy from 10% to 50% of rated power and energy, voltage. Example, long life of several years required ;load on resistors clearly less than rated power , energy, voltage. Otherwise, just one of short time(1 or 2 times) test application , which might be dissipate full power or higher . 100 Dissipation power rate [%] (1hr. later power on , in room temp. 28˚C ) Impulse withstand volltage ratio [%] Voltage reduction curve compare to std. impulse 1.2/50uSec (chart 4) 100 Short time over load : ΔR2% typ. for 10times of rated Wattage for 5secs. Short time allowable dissipation energy : 90J/㎤ Max. Resistives in bulk of Density : 2.55 typ. Specific Heat of Bulk Resistives : 500~1200J/kg-K typ. Thermal Conductivity : 1.2W[m-K] Water coolant type, or oil coolant type custom : please talk with 3RLab Engrs.. Custom design and specification: please talk with 3RLab Engrs.. Cap and Corona Ring of materials : std. Aluminum 80 60 40 20 0 100 1000 Impulse width [uSec] cf.: The described specifications & dimensions subject to change without notice. Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, United Kingdom. + 44 (0) 1342 834306 [email protected] http://www.willow.co.uk + 44 (0) 1342 835234 2