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Distribution transformers are among the most widespread on the market. Installed in residential, hospital, metro and industry buildings, they can feed different types of systems that do not require special services. This category of electric machine often takes the quality/price ratio more into account, without considering energy efficiency. GBE, in addition to offering high quality transformers, poses a lot of attention to propose more efficient machinery from an energy standpoint, which results in greater cost savings and less pollution. The new European directives actually require improvements that will lead to transformers with a better performance and lower environmental cost. In addition to the standard machinery with traditional grain oriented core, GBE offers transformers with an amorphous core, a technology that allows high performance and low losses to be achieved.

Fields of application: construction, industry, transport, etc.


The transformers for converters are made specifically to power loads whose waveform is not linear and the harmonic content not negligible. They can be produced with a single secondary

(6 – Pulse) or multiple secondaries (12, 18 and 24 – Pulse) phase shifted between themselves.

The transformers with different secondaries are indispensable when there is a need to reduce the harmonic distortion generated on the power line or in the case where it is required by the system that will be connected. The construction methods may vary depending on the type of converters to be connected and the electrical parameters required by the customer. In fact, there are many factors and issues to be taken into account, just due to the presence of non-negligible harmonic content in current and voltage. During the design, it is necessary to always take into account the most frequent problems: the machine overheating, given by the temperature increase in the windings caused by some types of harmonics that create localized magnetic fields; the stress on the magnetic iron core, caused by harmonics under voltage which, in addition to overheating, may give rise to saturation phenomena, especially when no decoupling reactor is present in the system.

To overcome these problems, in transformers for converters, the secondary side is provided with a greater insulation, as overvoltages are higher compared to those present on a line load.

Fields of application: induction furnaces, power supplies of large engines, installations and systems that require power control.


The elevator is a special transformer designed to increase voltage. It is usually connected immediately after a generator or at the beginning of two lines with different voltages. Considering the specific application of this type of transformer, during the design phase, GBE takes into account the voltages with which the machinery will work, so as to be able to offer a customized product, according to need.

Fields of application: systems with low voltage generators that distribute in medium voltage

Transformer for Photovoltaic Systems

The transformer for photovoltaic systems is the interface between one or more inverters of the photovoltaic panels and the distribution line. When dealing with plants with multiple inverters, multiple windings are made, by studying the impedances needed according to the system on which the transformer will be installed. Compared to other transformers, those intended for photovoltaic systems require a more resistant structure, since they are subject to a large number of release manoeuvres. To ensure the safety of the LV windings from discharge to ground, the ground connection is not included on the powered side.

Fields of application: photovoltaic systems

Transformer for Wind Power Plants

The transformer for wind power plants is used as an interface between the wind generator, powered by wind turbines and the distribution line.

This type of transformer can be installed either outside or inside the wind tower.

If positioned inside, the transformers can be installed at the base of the tower or on top of it.

The installation of the transformer for wind power plants can present different issues to be taken into account during the design phase:

The reduced space and subsequent limited heat exchange; strong vibrations; difficulty in assembly and disassembly in towers with smaller dimensions; when dealing with oil transformers, a higher class of insulation must be considered to avoid problems related to the temperature increase, as well as the use of special oils to minimize the risks related to flammability; the wind power sector provides for stricter environmental legislation, E3 environmental class, to ensure proper operation in extreme weather conditions.
GBE has E3 certification

field of application – wind power plants

Motor Starting


The transformer for starting the motors is designed to work primarily with large motors. A key characteristic of this type of transformer is the high current due to absorption of the motor during the start-up process, followed by a period of operation at the nominal current. While they may be undersized with respect to the nominal motor current, and the transformers to be connected to the motors, it is always necessary to keep in mind the most appropriate dimensions to ensure proper thermal and mechanical operation during start-up.

field of application – installations of large pumps, turbines, etc.


To reduce the in-rush current of the electric motors, especially on the larger ones, reduced voltages are used compared to the nominal one. The auto-transformer for motor start-up consists of an auto-transformer that usually occurs with sockets of 75%, 70% and 65% compared to the nominal voltage value. This way, the motor is started at a reduced voltage to then be connected to the mains and, finally, the transformer is de-energized. The dimensions with respect to the motor to be started are usually smaller, given that it has very brief operating periods (about 30 seconds). As in the case of transformers for start-up, during the design phase, it is necessary to take into account the correct thermal and dynamic dimensioning. If particular applications are required, the client must establish any voltage drop limits on the motor during start-up.

field of application – start-up of large motors with reduced current


Better known as grounding reactors, they are of the three-phase machines that are used to create a earthing point in systems where it is not present (on all insulated neutral lines). With this type of transformer, it is possible to assess any faulty currents and they are used in conjunction with Petersen Coil to ensure the correct operation of the line, even in the event of a grounding fault. In some cases, they are provided with a small power auxiliary to provide power to auxiliary power supply circuits. There are different construction methods for the grounding transformer, because it is always necessary to consider the very low ground impedance, ensuring correct short circuit voltage on the auxiliary winding. Given that the power of the auxiliary is variable, a value that can go from the grounding power up to a lower power of around a hundred times, it is necessary to carefully choose the type of construction to ensure the impedances requested. application – to create a neutral


Supply of transformers to Algeria

  • 2 February 2018

PUMPING OIL plant built by a leading Italian company in the Oil and Gas industry   GBE SpA has recently completed the supply of 4MVA oil transformers for a prestigious plant for the powering of twin-screw pumps for the Algerian state company. The contract was implemented in collaboration with a major Parma-based company operating in the […]


Hydromatters 4.0

  • 17 October 2017

Participation of GBE at the hydroelectric conference in Italy The prestigious annual conference entitled Hydromatters 4.0. recently took place in Padua. GBE SpA with the speaker Eng. Fabio Cavestro illustrated the constructive design used for transformers and reactors subject to occasional, continuous and severe mechanical vibration. During the seminar two types of installation were highlighted […]


Bunds for oil-filled Transformers

  • 10 July 2017

A flexible, easy-to-use solution designed by GBE Bunds for oil-filled transformers are a new product developed by the GBE steelworks department. For those installations where this bund has not been included, GBE has developed an extremely flexible solution, designed to protect the environment. The oil bund has been developed in pickled and subsequently galvanized metal […]

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