ET Metal Composite Tubular type Non

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 info@willow.co.uk
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 info@willow.co.uk
http://www.willow.co.uk
+ 44 (0) 1342 835234
2