Many years of experience and know-howPower resistors made by GINO can be found in all industrial sectors. For the development, design and manufacture of resistors our employees can draw on more than 50 years of experience. Broken down by technical applications, GINO manufactures air- and oil-cooled starter resistors, braking resistors, load and testing resistors as well as grounding and damping resistors. In addition, GINO also offers special resistors for all rating classes. Depending on the field of application, the most varied systems and nearly all commonly available materials are used for the manufacture of our resistors. In addition to economic aspects also the optimum utilization of the physical properties plays an important role for the selection of materials. Thanks to their vast expertise the engineers of GINO continuously develop new fields of application and manufacturing options. This applies in particular to the demanding field of transport engineering with its particularly high demands in terms of the operational safety, low-maintenance and long service life of train resistors. GINO’s product portfolio is supplemented by the manufacture and sale of crane cabins. In addition to the manufacture of standard cabins, the company also draws on its longstanding expertise for the production of special cabins. The product range is rounded off by the design and manufacture of crane operator seats and complete electrical systems for crane cabins and control platforms. The ultramodern CNC machines used in GINO’s sheet metal forming center complement our product portfolio. Modern software is used to translate CAD drawings, making them suitable for direct reading by the CNC machines. Highest precision is always ensured thanks to the use of special manufacturing processes such as laser cutting, chamfering and punch nibbling.
GINO braking resistors GINO braking resistors take on the excess energy of a driven motor thereby slowing it down. The driven motor takes on the role of a generator. The current direction and moment reverse and the generator tries to counter-act the drive forces, i.e. it brakes. Modern drive technology now only operates with three-phase motors. A slip ring motor with power supply from the grid with a reversed field takes the role of a generator, supplies its energy to the resistors in the rotor circuit and is thereby slowed down. However, state-of-the-art drive technology almost exclusively uses squirrel cage motors. Where the speed is to be controlled, static frequency converters are used which, in a first step, convert the line voltage to direct voltage (d.c. link voltage) and then into a three-phase output voltage with variable frequency. The motor speed follows the frequency at the outlet of the frequency converter. If the frequency is smaller than the actual speed, the motor becomes oversynchronous and turns into a generator that returns the excess energy. The energy is taken on by a braking resistor installed in the intermediate circuit. This may occur in the form of brief surges or, as in the case of a train driving downhill, of energy acting for a longer period of time. The braking resistor must be capable of taking on both brief surges and the specified continuous load. In principle, all designs are suited for application as braking resistor. For smaller drives, wire-wound resistors are often used while larger drives require cast iron, steel grid or ribbon-wound resistors. GINO cast iron resistors GINO cast iron resistors use cast iron as resistor conductors. Cast iron is a very economical material, particularly for resistors used for intermittent or short-term operation where the storage capacity is most important. For this application, the iron is cast into plates with wave-pattern rods. The diameter and length of the rods as well as the material characteristics determine the resistance of the element. Several different elements with varying rod diameters and lengths but with the same connection and fixing points form a system. In addition to the latest in cast iron resistor systems (GINO, SIEMENS 3PR3…) GINO GmbH also manufactures and supplies spare parts and spare elements for most systems ever sold on the marketplace. The main field of application for cast iron resistors are starting and rheostat resistors for drives, particularly drives with a slip-ring motor, which are increasingly replaced by drives controlled with static frequency converters with squirrel cage motor. Other applications are grounding resistors where an optimum price/performance ratio of the storage capacity is most important GINO damping resistors GINO damping resistors in general are resistors that have the task to limit the current in a circuit or prevent inadmissibly high current or voltage peaks. Particularly the resistors used in filter circuits are called damping resistors and are switched in parallel to the reactance coils to dampen them. The resistor takes on the voltage peaks that form in the reactance coil thereby preventing inadmissible voltage surges. It reduces the circuit quality factor thus resulting in a larger filter bandwidth. GINO excitation resistors GINO excitation resistors are starting resistors for magnet coils. Magnet coils are usually wound with copper conductors. Copper has a relatively large temperature coefficient of the resistance value so that a coil at operating temperature has a resistance value that is up to 20% higher than that of a cold coil. Consequently, a magnet coil usually has a lower intrinsic resistance as compared to its nominal voltage. A starting resistor, the so-called excitation resistor, adjusts the desired operating current to be achieved at operating temperature. Moreover, excitation resistors made from a suitable resistor alloy also compensate the temperature coefficient of the total resistance in a circuit. A typical example for an excitation resistor is the field resistor of d.c. machines which adjusts the excitation current and thus the speed of a motor or the voltage of a generator. Fast response resistors are starting resistors for magnet coils that alter the pickup properties of the coils. The coil is operated with a starting resistor at a higher, mostly double, nominal voltage. The starting resistor reduces the time constant of the total circuit T = L/(Rv+Ri), results in a faster current rise and thus in a faster build-up of the magnetic field. Another way to reach this objective is to excite the coil with a high current and then insert an upstream economy resistor. However, this solution is only feasible when a change of the excited magnetic circuit results in the same magnetic induction as during the starting phase. A typical example would be the power contactor with d.c. excitation. GINO grounding resistors GINO grounding resistors. In medium voltage grids with low-resistance neutral grounding, grounding resistors restrict any ground fault current to a maximum admissible value until the corresponding protective relays have switched off the defective circuit. In compensated grids where the neutral points are grounded via inductivities, they serve to localize any existing ground fault by briefly connecting the neutral point of the transformer to a resistor to increase the effective component of the fault current. Grounding resistors are typical resistors for short-term applications. Their main feature is their energy storing capacity. Therefore, cast iron resistors are often selected for such applications. GINO ribbon-wound resistors GINO ribbon-wound resistors are a special type of sheet resistors. Small sheet strips or ribbons are used as resistor conductors that are either flat-wound or edge-wound, applied as wave-form spiraled structures or connected in series as individual strips with terminals, by hard-soldering or welding. With this method, high-performance low-resistance resistors are obtained. The advantage of ribbons is the same as that of sheets: large surfaces can be obtained at a comparably low material weight this being decisive for the heat transfer at high continuous loads. GINO sheet resistors GINO sheet resistors use sheets that are punched in a wave pattern or provided with slots to increase the current distance and create a defined resistance value. With elements of the same size, different punching or slotting can create a large number of different resistance values that form a system and can be freely combined. Given their grid-type appearance and the steel alloys that are frequently used as resistor material