Power resistors are employed in power technology and distribution, manage systems, and other energy technique applications. Examples incorporate load banks, grounding resistors, and dynamic braking resistors.
There are many possible production techniques but resistors dependent on thick film technological innovation substrates offer high integration density that can make it perfect for apps exactly where substantial energy dissipation is necessary in a modest spot. The content characteristics of the substrate imply it is an exceptional match with the aluminium substance in heatsinks and it is chemically inert and mechanically secure.
Specific carrier resources, these kinds of as Silicone Nitrite might be utilised to generate a power resistor in the kW variety. However, these supplies can be pricey and may value as significantly as € 200 every single in purchase portions of a handful of thousand models, furthermore the costs for processing with Thick Film supplies. This signifies these kinds of supplies are usually only employed for professionals applications.
Illustrations incorporate a power resistor with proportions 100 mm by fifty mm on one mm thick Alumina Ceramic that can manage five hundred W provided the element temperature is retained constant at close to 60 °C. Resistor load banks with power rankings as large as twenty five kW @ 140 kVolts could be produced.
When produced properly using acceptable components Thick Movie energy resistors can take care of numerous kW of power dissipation but they make large amounts of warmth which will fracture the resistor provider plate if not retained below management. Careful consideration of the application and thermal administration is therefore required ahead of committing to the resistor layout and production approach.
One particular solution to the resistor thermal overload issue is to submerge the energy resistor in higher grade mineral oil in a heat exchanger. The exchanger should be developed correctly to ensure it is able of taking away the heat created so the oil temperature is kept continual at a risk-free amount.
Appropriate administration of the warmth exchanger is required as Impurities in the sort of carbon deposits are created in higher voltage oil cooled programs and except if oil is filtered and / or otherwise stored at higher quality by means of normal replacements, this sort of impurities will build to a amount the place one or more resistors are shorted out of the loop and as a result trigger other resistors in the chain to overload and fracture. Annually oil adjustments are consequently advisable.
A electrical power resistor manufactured making use of thick film technology gives a fairly low price, high overall performance, small footprint remedy for a vast assortment of power apps. However, mindful consideration of thermal issues is needed during the style stage to guarantee trustworthy operation. Learn more about power resistors here.