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KWX High Voltage Resistors HJR

KWX High Voltage Resistors HJR
2Pages

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Custom HJR High Energy resistor stacks employ heavy-duty components for mechanical mounting, electrical isolation and termination. yielding ratings to thousands of kilojoules of single-surge energy. High Energy resistors offer unsurpassed performance in high energy and high voltage applications. These non-inductive, ceramic composite resistors are designed for pulse shaping, crowbar, capacitor charg / discharge • • • any application requiring low inductance along with extremes of voltage and energy. They are ideally suited for use in pulsed power systems, where these resistors distribute energy uniformly throughout their structure for low thermal stress.The standard, high-temperature silicone coating enhances high voltage performance in air. Optional configurations optimize performance in other gaseous or fluid dielectrics. These resistors are also available as a solid disk without center bore. % Features I .100% Active Material E. High Surge Energy Rating H. High Voltage Withstand IV. Essentially Non-Inductive V. Wide Resistivity Range \d. Wide Range of Geometries W. Air / Oil / SF6 Environments Vffl Single Disc or Modular Assemblies IX. Custom Solutions Readily Available X. Free Design Service % Peformance 0 Applications HJR High Energy resistors are most often usedfor low repetition rate discharge, crowbar, pulse shaping or other impulse duty. In practice, a resistor or combination is selected to yield no more than 100oC rise for the expected applied energy. Because of the large mass, a relatively long cooling time is required between pulses, or additional heat capacity must be allowed for.Our applications spreadsheet (MS Excel,available on diskette) can beused to easily model heat-up and cool-down profiles for your specific application. 0 Power Dissipation Continuous power dissipation for HJR High Energy resistors is a function of mounting method used. In free air, .25 watt per cm2 of exposed surface area is a conservative rule of thumb. Thus, a 50mm disk with both faces and the periphery exposed could easily dissipate 20 watts. Higher power dissipation is achieved by conduction cooling through the mounting surface, applying an air or water cooled heat sink to either or both faces. See product information describing Custom Assemblies for more information on this subject, or consult our applications group.

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0 Derating Curve Maximum impulse voltage is mainly a function of resistance value and pulse width, and to a lesser extent, surface temperature and dielectric medium. The chart below shows the range of maximum impulse voltage for the standardized 1.2/ 50 [xsec. pulse width in air.,which indicates the range and relative impulse ratings for thevarious standard sizes.Our applications group can assist you in assessing the correct parameters for your application. 50 40 i-1 9 30 °20 SHENZHEN KWX ELECTRONICS CO., LTD Http: //www.kwxcomL.com

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KWX High Voltage Resistors HJR 2Pages

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KWX High Voltage Resistors HJR
2Pages