Ribbon-wound resistors


Ribbon-wound resistors use ribbons or sheet strips as resistor conductors. Depending on the design, ribbon-wound resistors can be broken down by wave-pattern “folded” ribbons or spot-welded ribbons connected in series as individual strips. With this method, high-performance resistors with low-resistance are obtained. The advantage of ribbons is that large surfaces can be achieved at a comparably low material weight, the former being crucial for the heat transfer at high continuous ratings.

Regarding the ribbon design, two types are possible:



Continuously folded ribbons with terminals at both ends.

Picture: 3PQ4 design, continuously folded ribbon, mounted on special plug-in ceramic supports, suited for permanent temperatures of up to 850 °C. Patented by Siemens.



Individual ribbons, inter-connected (mostly by spot welding).

Picture left: 6GN1 design, spot-welded ribbons mounted on support brackets with ceramic insulators.

Both techniques have their special features and offer specific advantages over the other one. The optimum design for a given application is dependent on the specific requirements and design conditions. The selection and design require long years of experience and are performed at GINO in collaboration with the experts from our system development function.

Applications

GINO ribbon-wound resistors are used in the following systems:

Starter switches

Starter switches are starters with air-cooled resistors. The starter steps are switched using contactor-type starters that are controlled via time relay or PLC as a function of the power or speed, and that can be replaced individually in case of a malfunction.

Braking resistors

Braking resistors transform the energy of driven masses by electrically braking the motor propelled by kinetic energy.

Load and testing resistors

Load and testing resistors act as a substitute for the consumer in the presence of energy sources. They are used for testing and for checking batteries, transformers, generators, power generators and power supply units. They can be used to simulate operating conditions to test the performance capacity of energy supply systems.

Transport Engineering, train resistors

Particular demands in terms of the electrical and mechanical load carrying capacity and operational safety, low maintenance and long service life are made on resistors for applications in transport engineering.

Text © GINO AG


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