Transformers are static machines that, despite being “dated”, still play a role of primary importance in electromechanical applications. The galvanic separation between the windings that guarantees the disjunction between the primary and secondary circuits in a plant or in an electrical panel and the possibility to vary the input and output voltages, adapting them to the different needs, are the main operating functions.
These characteristics offer the possibility to face different markets, in particular the sectors related to automation, machine manufacturers, work centers or large production lines; In fact, these applications require an adequate power supply which, often, is different depending on the destination country.
Also the normative part can differentiate according to the location of the final user of the transformer, against this the correct choice of the type of homologation necessary is fundamental.
Often when it comes to homologated products, in particular for converters destined for the American / Canadian market, “conformity” is confused with the real compliance with UL / CSA standards; the simple word “insulation system” does not means that the product is subjected to specific tests as requested by the certifying body, but only indicates that the components do not have a negative interaction with each other and in particular with the main product of the system itself, ie the paint. All the approvals of Italweber Elettra transformers are the result of analyzes and tests carried out by the single bodies, which submit the products to all the tests required by the reference standard (eg: in the case of UL, version 5085).
The classic way to produce an approved transformer is to use products that are already part of an insulation system, components that once assembled offer ample guarantees of mechanical resistance and to different classes of operating temperature.
The importance of a correct choice of the basic components is highlighted in particular when it is necessary to maintain the temperatures, and consequently the magnetic losses, within the limits required by the standard; the correct proportion between the fundamental components copper / aluminum and iron is specifically determined by an exclusive calculation program that is continuously implemented according to the tests carried out on transformers made.