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1!1111!1 electromateriales
It is remarkable on designing Braking Resistors
the need of placing them in defined and reduced
places, almost ever impossible to readjust due to
design imperatives of machine to be controlled. i.e.,
traction motors for electric locomotives. This
reduced room and the particular design of it are
essentially enforcing to introduce a forced
ventilation system and a special design of resistive
elements.
Braking Resistors are usually installed:
• On the roof of a vehicle.
• Under trame.
• lnside the vehicle.
The interchange of heat between the resistor
element and the surrounding air can be increased by
the flow of air at ambient temperature, this flow of air
will increase the displacement of hot air and will
achieve in short time a bigger volume of cold air in
contact with the resistor elements and therefore a
higher heat-exchange.
This technique together with installation of resistors
in adequate chosen compartments will allow that
traction type resistors will work at higher
temperatures than the standard’s type. Working
temperature of selected resistive materials will be
above 1000 ºC.
Resistor elements are assembled in banks by means
of strong rods and ceramic spacers. Segments of
resistor banks are mounted in a strong support
frame of stainless steel.
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High temperatures require a careful choose of the
insulated materials which directly support the resistive
elements; such insulators must withstand strong and
continuous thermal shocks. Besides, in view that
resistors must be in direct contact with atmosphere,
insulators chooses must have low humidity absorption
value. Stainless steel is also used for bolts, nuts and
washers.
Resistors mounted in motor-powered vehicles are
exposed to sine waves vibrations of variable
amplitude and frequency. KLK, when designing
resistors has consideration the international
standards requirements for vibration and shocks.
Resistors are designed by our team with a
sophisticated 3D model in order to find the best
solution for our Customers. Desing and production,
strictly follows our ISO 9001:2008 quality standards
as well as the most severe internationational
specifications.
A Railway Resistor is a 100% tailor made product,
where a few constructive and technological principles
are applied in a project- specific.
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