GENERAL

    
 

Ceramic Carbon Resistors can be offered separately, in matched sets with respect to Resistance Value, or pre-assembled for ease of installation. Resistor Discs can also be supplied in stacks, marked and numbered for optimum flatness and parallelism.

It is generally recommended that HVR carry out any assembly work since using our specialised jigs, we will ensure that Resistor Discs are aligned correctly and that the appropriate mounting force is applied. This is important not only for mechanical reliability, but in minimising the risk of electrical activity between successive resistor discs and the disc / terminal interface.

Wherever possible, a Resistor Assembly will be designed using standard components, thus enabling us to offer the most cost effective solution.
 
 
•

Glass Fibre Pultruded Tie Rod onto which the Resistor Discs are mounted
•

Aluminium Hexagon End Stops, pinned at either end
•

Schnorr Disc Springs which provide the compressive mounting force (≥ 350 kg)
•

Insulated Stand Offs (Glastic) for ease of installation
•

Cranked Aluminium Terminals for Electrical Connection
 
 
 

In some applications, it may be necessary to include other components so that the Resistor Assembly will meet Electrical, Thermal and Mechanical Design Specifications.

These may include:
•

Using a High Tensile Steel Bolt and Insulating Bushes for UL94 V-0 Regulations
•

Aluminium Ferrule / Spacers for increased Average Power Rating
•

Aluminium Cooling Fins for increased Average Power Rating

•

Water Cooled Plates for increased Average Power Rating. If required, Cooling Plates can be electrically isolated from the Resistor Discs.
•

High Current Terminals for Optimum Current Distribution
•

High Current Terminal / Spacers for Improved Average Power Rating
•

Customised Components where required e.g. Tinned Copper Terminals
•

Customer Specific Components e.g. Thermal Switches
 
 

HVR Applications Department offers a 'Free of Charge' Design / Advisory service - we would be pleased to discuss any specific requirements you may have.

Previous designs include:
 
 
 
 
 
 
 
 
   

• Mechanical Dimensions (L x W x H):

336 x 60 x 125 (mm)

• Assembly Resistance Value:

1K0 ± 10%

• Required Impulse Duty:

1 x 75 kJ every 2400 s

• ΔT Peak (1 x 75 kJ / 2400 s):

≤ 100 °C

• Design Working Voltage:

25 kV (200 / 200,000 µs)
   
   
   
   
   
       
 
 
 
 
 
 
 
 
   

• Mechanical Dimensions (L x W x H):

240 x 152 x 195 (mm)

• Assembly Resistance Value:

25R0 ± 5%

• Required Impulse Duty:

1 x 180 kJ

• Full Cooling:

≥ 5 Hours

• Design Voltage Withstand:

≥ 15 kV (1.2 / 50 µs)
   
   
   
   
   
       
 
 
 
 
 
 
 
 
   

• Mechanical Dimensions (L x W x H):

126 x 112 x 142 (mm)

• Assembly Resistance Value:

10R0 ± 10%

• Required Impulse Duty:

10 x 17.6 kJ every 3600 s

• ΔT Peak (10 x 17.6 kJ / 3600 s):

≤ 110 °C

• Design Working Voltage:

750 V
   
   
   
   
   
       
 
 
 
 
 
 
 
 
   

• Mechanical Dimensions (L x W x H):

331 x 152 x 195 (mm)

• Assembly Resistance Value:

50R0 ± 10%

• Required Power Rating:

1100 W (Continuous)

• Additional Impulse Duty:

5 x 1kJ (Infrequent)

• Design Voltage Withstand:

≥ 50 kV (1.2 / 50 µs)
   
   
   
   
   
       
 
 
 
 
 
 
 
 
   

• Mechanical Dimensions (L x W x H):

386 x 152 x 195 (mm)

• Assembly Resistance Value:

1R25 ± 5%

• Required Impulse Duty:

1 x 225 kJ every 600 s

• ΔT Peak (1 x 225 kJ / 600 s):

≤ 130 °C

• Design Voltage Withstand:

≥ 2.5 kV
   
   
   
   
   
       
 
 
 
 
 
 
 
 
   

• Mechanical Dimensions (L x W x H):

300 x 140 x 375 (mm)

• Assembly Resistance Value:

6R0 ± 10%

• Required Impulse Duty:

1 x 100 kJ every 900 s

• ΔT Peak (1 x 100 kJ / 900 s):

≤ 110 °C

• Design Voltage Withstand:

≥ 3.1 kV (CR = 75 ms)
   
   
   
   
   
       
 
 
 
 
 
 
 
 
   

• Mechanical Dimensions (L x W x H):

358 x 150 x 191 (mm)

• Ceramic Resistor Disc Type:

AB 038, O/D = 127 mm

• Disc Resistance Value:

Various

• Resistor Tolerance:

± 10%

• Resistor Assembly Construction:

Inter - Disc Tapping Points
   
   
   
   
   
       
 
 
 
 
 
 
 
 
   

• Mechanical Dimensions (L x W x H):

620 x 260 x 560 (mm)

• Assembly Resistance Value:

0R3 ± 10%

• Required Impulse Duty:

3.5 MJ per Impulse

• Time between Successive Impulses:

≥ 1500 s

• Design Working Voltage:

900 V DC
   
   
   
   
   
       
 
 
 
 
 
 
 
 
   

• Mechanical Dimensions (L x W x H):

286 x 155 x 195 (mm)

• Assembly Resistance Value:

0R5 ± 10%

• Required Impulse Duty:

1 x 250 kJ every 450 s

• ΔT Peak (1 x 250 kJ / 450 s):

≤ 115 °C

• Design Voltage Withstand (BIL):

≥ 32 kV (1.2 / 50 µs)
   
   
   
   
   
       
 
 
 
 
 
 
 
 
   

• Mechanical Dimensions (L x W x H):

140 x 180 x 170 (mm)

• Assembly Resistance Value:

0R08 ± 10%

• Required Impulse Duty:

1 x 100 kJ every 1800 s

• ΔT Peak (1 x 100 kJ / 1800 s):

≤ 115 °C

• Design Voltage Withstand:

≥ 1 kV (CR = 10 ms)
   
   
   
   
   
 
 
 
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
                     
Home  |  Site Map  |  About HVR  |  Products  |  Applications  |  Agents  |  Contact Us  |  Events
   Copyright © HVR International Limited 2015. All Rights Reserved. This page last updated: 17 April, 2013.