LV Isolation Transformers and Reactors

ISOLATION TRANSFORMERS

These transformers are specifically designed and manufactured to guarantee the load protection. Isolation transformers usually provide a unit transformation ratio (e.g. 400/400V) and are used to uncouple the load from the power supply grid, as the primary and secondary windings are galvanically isolated.

The typical sectors of application are telecommunication systems, data centre power supply systems, trafoless UPS power supply, by-pass line protection, public building systems.

Standard isolation transformers

Isolation transformers are always equipped with an electrostatic screen between the primary and secondary windings.

The windings are made in a delta/star or delta/zig-zag configuration (with star center available) to eliminate the third and multiple-ofthree harmonics.

Isolation transformers perform various functions and, in particular, in data center power supply systems, they can be used for the following purposes:

Within a UPS, to act as an integral part of power conversion circuits.
To create a locally grounded stable neutral point.
Inside distribution units to reduce harmonic currents.
If equipped with sockets, to allow voltage adjustment to comply with load requirements.
To eliminate ground loops with multiple generators or network sources.

Ortea Next manufactures a range of standard isolating transformers having K factor 4, 13 and 20, but we can meet any specific need of the Customer.

K-rated isolation transformers for non-linear loads

These isolation transformers are specifically designed to cope with the high level of harmonic distortion generated by non-linear loads. Typical non-linear loads are computers, variable speed drives, inverters, welding machines. The harmonics generated result in a higher effective value of current and therefore in an increase in Joule losses.

In order to ensure compliance with the temperature limits defined by the thermal class, the design of the transformer must take account of these harmonics. The degree of influence of harmonic distortion is indicated by the K factor: the higher the K value, the higher the harmonic content that the transformer must withstand without damage.

Isolation transformers for UPS

These transformers are used for AC/DC conversion and DC/AC rectification units that are typical of uninterruptible power supplies (UPS).

These transformers are highly customized and standard types cannot be defined, as their design is linked to that of the machine in which they are to be installed. Both the electrical parameters and the mechanical characteristics meet precise specifications drawn up by the UPS manufacturer.

Close cooperation is therefore essential for the development of the most suitable solution.

Thanks to its decade-long experience, Ortea Next designs and manufactures transformers that are suitable for any type of UPS system.

Partnerships with the world’s leading manufacturers provide evidence of the high degree of reliability achieved.

Isolation transformers for photovoltaic systems

These are actual isolation transformers, but made in such a way as to have very high efficiency, i.e. minimised losses.

This characteristic is required by the fact that photovoltaic conversion systems offer low levels of efficiency.

The use of a low-loss transformer allows to optimise the management of the system, as it increases the amount of energy transferred to the managing body, thus improving the economic performance of the system.

TRANSFORMERS FOR RECTIFIERS

They are used for special industrial applications mainly in galvanic plants (chromiumplating, zinc-coating, etc.). The rectifier converts alternating current to direct current. Again, the transformer is developed specifically for the rectifier for which it is intended.

The conversion unit can have different configurations (three-phase bridge, six-phase with or without interphase coil, twelve-phase, etc.) and each one requires the sizing of a dedicated transformer.

The type of use requires high secondary currents in the thousands of amperes. The know-how of Ortea Next design engineers leads to the best possible engineering and development of output bars, that represent one of the most critical parts.

GENERAL-PURPOSE TRANSFORMERS

Transformers are often used just to adapt the voltage coming from the grid to the voltage required by the system or the machinery to be power supplied. In this case, each transformer is intended for the specific use.

Thanks to their professional expertise, Ortea Next’s design engineers process user’s data to find the best solution in terms of efficiency, cost-effectiveness and performance.

REACTORS

Thanks to many years of experience and close collaboration with Customers, Ortea Next has developed a specific knowledge that allows to manufacture reactors in the light of the various problems that may arise from the wide variety of uses in which these magnetic parts are employed.

Production processes being very versatile, we can cover a wide range of uses.

In particular, we produce for both indoor and outdoor use:

Three-phase and single-phase reactors.
Reactors with iron or air core.
Detuning reactors.
Smoothing reactors.
Blocking reactance.
Inrush current limiting reactors.

Our reactors are manufactured in accordance with the relevant technical standard (IEC 60076).

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LV TRANSFORMERS AND REACTORS