ALPHA

CBS-H / CBS-V ALUMINIUM HOUSED COMPACT BRAKE RESISTORS

IP20 / IP54

The CBS-H and CBS-V with optional integrated thermo watch from our high power range of ALPHA ALUMINIUM HOUSED COMPACT BRAKE RESISTORS are electrically insulated and with small dimensions. They can easily be fitted into compact constructions and are especially designed to endure very high pulse loads without getting hot and triggering any smoke alarm. The steady state power range span from 410W to 3600W and they can withstand pulse loads of up to 200 times these values for one second every hour. The total cooldown down is about one hour for all resistors. Reinforced versions for Low Voltage Ride Through - LVRT (Energy Dump Resistors) for Wind Turbines are available. In fact, the CBS range is most suited for this application.

Danotherm has developed thermal models for all resistor types and resistor values. By using these models we are able to predict the temperature rises of the resistor wire and on the surface for all possible load applications. We offer our assistance to customers to find the optimum solution for any situation. CBS resistors are optionally available with connection box in different design for different cable sizes and from IP20/IP54, please require special data sheets. The resistors can on your request comply to IP65.

Standard

On demand

Standard

CBS – H X X X PN

-H: Profile horizontally [W]

-V: Profile vertically @ 40°C

B: Box IP65 < 10mm2 Acc. to

BG: Box IP65 < 50mm2 UL

T: Internal thermo watch 508281 configuration

CBS-H 180 H 410

CBS-H 210 H 580

CBS-H 260 H 850

CBS-H 330 H 1135

CBS-H 400 H 1375

CBS-H 460 H 1585

CBS-H 560 H 1925

CBS-H 660 H 2270

CBS-H 760 H 2770

CBS-H 860 H 3190

CBS-H 960 H 3565

CBS – H X X X PN [W]

Time [s] 1 2 5 10 20 40

CBS-H 180 H 410 32 22 13 8,2 5,2 3,4

CBS-H 210 H 580 55 35 20 12 8 5,2

CBS-H 260 H 850 89 57 32 20 12,5 8,1

CBS-H 330 H 1135 138 87 49 31 19 12

CBS-H 400 H 1375 204 126 69 43 26,5 17

CBS-H 460 H 1585 288 174 92 56 34 21,5

CBS-H 560 H 1925 400 236 124 75 46 28,5

CBS-H 660 H 2270 468 280 148 91 55 35

CBS-H 760 H 2770 544 324 174 107 66 42

CBS-H 860 H 3190 720 420 218 132 80 50

CBS-H 960 H 3565 728 432 230 142 87 55

0.6 s high / 2.4 s ramp

down Max. Peak

59

94

36

25,5

78

Square + triangle

3 s high / 3s ramp

[kW] @ 40°C

down Max. Peak

General Specifications

Dielectric strength:

De-rating:

Environmental:

Overload: @ 5 sec pulse/hour

Isolation Resistance:

Working Voltage:

Overload: @ 1sec pulse/hour

Load examples on standard 1 profile 5 Ohm resistor

[kW] @ 40°C

Square + triangleTriangle

3 seconds

Max. peak

[kW] @ 40°C

< ± 100ppm

3500VAC @ 1 minute

6000VAC @ 1 minute

1000VAC / 1400VDC

> 20MΩ

Linear: 40°C = PN to 70°C = 0.75*PN

Thermo watch, optional:130°C / 160°C / 180°C / 200°C, 2A, 250VAC NC

-40°C – 90°C

30 – 60x (depending on resistor type)

80 - 225x (depending on resistor type)

Temperature Coefficient:

Square pulse load [kW] 1 pulse / hour - 1 profile resistor

284

184

154380

448

520

664

688

552

568

432

30

144

170

232

314

16

114

86

61

40,5

49

118

204

280

268

214

372

Construction

The resistors are designed as follows:

The resistor elements for high resistance types are wire wound on mica support

sheets. Lower resistance elements are made with helix wound wire elements mounted

in special designed ceramic fixtures. The outer housing is an aluminium profile isolated

with micanite sheets on all inner surfaces. The resistor elements are fixed symmetrical

in the profile by ceramic insulators. This ensures a symmetric expansion of the

resistors and a maximum stability to high load impulses. The aluminium profile with the

fixed resistor element is filled with Al2O3 .This ensures a minimum change of the

resistor surface temperature even if the resistor element reaches its maximum

temperature during a pulse load.

The standard cables are 300 mm AWG 18 – AWG 04 , 1000V. We can supply cables

in specified length and mounted with cable shoes or connectors as required.

Pulse shape The ability to withstand pulse loads varies per resistor size, wire length and wire diameter. As such, it is impossible to create standard graphs that would apply for most customers applications. In some cases the load is a combination of a square form + triangle, such as Low Voltage Ride Through (LVRT) and emergency brake situation. At your request Danotherm will perform the simulation for you based on your application. For your understanding Danotherm has already produced curves for some different load forms for resistors with standard wire. Please, note that these are only examples. Shown curves are based on a resistor with a 5 ohm value and normal wire thickness. Depending on your application we can change the construction of the resistor to fulfill your demands best without over dimensioning. In the table you find the absolute peak power of a square pulse during 1 to 40 seconds. Only one pulse per hour is applied. At that time the wire temperature will reach its maximum limit. The housing temperature will not increase much and will normally stay below a ∆T of 50K. The graph shows the absolute overload ability. For this pulse form, depending on size of the resistor and constructive an overload is possible of 70 to 200 x PN at 1 second.

1

10

100

1000

1 2 5 10 20 40

Squ

are

pu

lse

[kW

]

Time [s]

Squre pulse load CBS-H 960 HCBS-H 860 HCBS-H 760 HCBS-H 660 HCBS-H 560 HCBS-H 460 HCBS-H 400 HCBS-H 330 HCBS-H 260 HCBS-H 210 HCBS-H 180 H

3 3 0.6 2.4 3

CBS – H X X X PN [W]

Time [s] 1 2 5 10 20 40

CBS-H 180 H 410 31 40 62 85 108 136

CBS-H 210 H 580 54 68 101 134 168 208

CBS-H 260 H 850 89 110 160 212 264 328

CBS-H 330 H 1135 138 170 244 320 400 496

CBS-H 400 H 1375 204 248 348 448 552 688

CBS-H 460 H 1585 292 348 468 592 712 872

CBS-H 560 H 1925 404 476 632 792 952 1168

CBS-H 660 H 2270 472 560 752 944 1152 1408

CBS-H 760 H 2770 552 656 880 1112 1360 1680

CBS-H 860 H 3190 728 848 1112 1376 1664 2032

CBS-H 960 H 3565 736 864 1152 1472 1808 2240

CBS – H X X X PN [W]

1 2 5 10 20 40

CBS-H 180 H 410 66 44,5 28 18 11,4 7,3

CBS-H 210 H 580 114 74 44,5 28,5 17,5 11,1

CBS-H 260 H 850 186 120 70 45 27,5 17,5

CBS-H 330 H 1135 288 182 106 68 42 26,5

CBS-H 400 H 1375 424 264 150 95 58 36,5

CBS-H 460 H 1585 600 364 200 123 74,5 46

CBS-H 560 H 1925 832 500 268 164 99 61,5

CBS-H 660 H 2270 976 588 320 198 120 75

CBS-H 760 H 2770 1136 688 376 234 142 89

CBS-H 860 H 3190 1488 880 472 288 174 107

CBS-H 960 H 3565 1504 904 496 308 190 118

Energy exponentially decaying [kJ] 1 pulse / hour - 1 profile resistor

Triangle pulse load [kW] 1 pulse / hour - 1 profile resistor

Time [s]

Exponentially decaying load pulse Mainly for emergency brake situations load patterns are often an exponentially decaying load, starting at a very high peak and going down in time. Energy levels of 1M5 Joules for the CBS-H 760 is very well possible. In case more energy is needed we offer resistors up to 1000mm long. If needed special wire is used to further increase the energy capability. Please use this formular for calculating values that are not mentioned in the table at the left side.

t = time, E= enery

Triangle pulse load Standard load patterns for LVRT applications do not exist, as every country and many energy producing companies define their own LVRT specifications. The shape and time varies , also the repetition rate. Sometimes it is specified that 2 or 3 grid fault can occur within every 30 minutes in a sequence. Please contact Danotherm with your specifications . The data in the table next is the peak power ramping down to 0 within specified time.

1

10

100

1000

1 2 5 10 20 40

Po

wer

[kW

]

Time [s]

Triangle pulse load [kW] 1 pulse / hour CBS-H 960 H

CBS-H 860 H

CBS-H 760 H

CBS-H 660 H

CBS-H 560 H

CBS-H 460 H

CBS-H 400 H

CBS-H 330 H

CBS-H 260 H

CBS-H 210 H

CBS-H 180 H

10

100

1000

1 2 5 10 20 40

Ener

gy [

kJ]

Time [s]

Energy exponentially decaying [kJ] 1 pulse / hour

CBS-H 960 H

CBS-H 860 H

CBS-H 760 H

CBS-H 660 H

CBS-H 560 H

CBS-H 460 H

CBS-H 400 H

CBS-H 330 H

CBS-H 260 H

CBS-H 210 H

CBS-H 180 H

Type L +/- 2 L1 +/- 1 Type L +/- 2 L1 +/- 1CBS-H 180 H 180 80 CBS-H 560 H 560 460

CBS-H 210 H 210 110 CBS-H 660 H 660 560

CBS-H 260 H 260 160 CBS-H 760 H 760 660

CBS-H 330 H 330 230 CBS-H 860 H 860 760

CBS-H 400 H 440 300 CBS-H 960 H 960 860

CBS-H 460 H 460 360

Applications examples showing resistor units with several CBS profiles Low Voltage Ride Through - LVRT and emergency brake for Wind Turbines.

Danotherm Electric A/S

Næsbyvej 20 . DK - 2610 Rødovre . Denmark Phone +45 36 73 22 22 . Fax +45 36 73 22 23 danotherm@danotherm.dk . www.danotherm.dk

Type identification:

Please specify your CBS Brake resistor as follows

CBS-H 660 C (H) (T) 22R 0 0 1

Last digits XXX > 400: Customer specified version, otherwise:

Thermo watch temperature: 5 = 130°C; 6 =160°C; 7 = 180°C; 8 = 200°C;

Ohm Value (Examples: 2R2 = 2.2Ω; 22R = 22 Ω; 220R = 220Ω; 1K0 = 1.0 kΩ )

T: Thermo watch

H: Helix wire element (Specified by Danotherm)

Connection C: Cables

Length of resistor profile in mm.

H: Horizontally mounted profile; V: Vertically mounted profile;