Having been originally designed for use in thyristor protection circuits, Arcol's HSW600 is most suitable where water cooling is available and space limited. The withdrawal of heat, internally and externally, ensures a low temperature gradient across the unit reducing internal stress. Heat is extracted internally through the cooling pipe and externally by direct mounting onto a chassis or additional water-cooled heatsink, thereby reducing temperature gradient across internal insulation.
Key features of the HSW600 are: balanced cooling; low induction windings; moulded-in insulated cable terminations; high power for small size.
Standard tolerance is ±5% (J), while typical temperature coefficients are: 25 ppm/°C above 50 Ω, 50 ppm/°C for 1-50 Ω, 100 ppm/°C for below 1 Ω. Insulation resistance (dry) is 10 000 MΩ minimum. Power dissipation derates linearly to zero at 200°C.
The resistor core is made of High Alumina Ceramic with high thermal conductivity and is capable of withstanding severe thermal shock. The water pipe (copper) and wound former is encapsulated in aluminium housing ensuring good humidity seal and a high level of voltage protection. The ground finish ensures maximum contact with the resistive element for rapid heat transfer.
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