The following technical notes provide a reference for the selection and use of transformers in various application sectors. The construction differences between different transformer models are due to requirements established in standards concerning electrical installations and equipment.
Below, we provide the fundamental definitions appearing in the applicable standards. The technical data given in this catalogue are not binding on AB trasformatori srl and can be amended without notice.
AB trasformatori srl products are wound with UL CSA insulation system-approved enamelled copper wire to insulation class F or H. Windings may also be composed of insulated copper foil or strip. To continue
CE marking attests to the conformity of the products in relation to the essential requirements of European Community directives. To continue
The protection class is a construction characteristic of a safety device providing protection against electric shock. Protection classes are as follows:
Protection class I
All accessible metal parts of the transformer are separated from live parts by means of the basic insulation. To continue
Thermal insulation classes rank insulation materials in relation to the maximum temperature they can withstand though time without affecting their mechanical and electrical characteristics. To continue
Non short circuit proof transformer
Transformer designed to be protected against a temperature rise (overload or short circuit) by means of a protection device that is not supplied with the unit. To continue
Transformer power ratings are expressed in VA. Specifications frequently give the power of the load to be supplied, expressed in watts or kilowatts. To continue
If the rated full power of the transformer is not used in a continuous duty cycle, the transformer can be overloaded with higher power values.
In this context, refer to the indications given in table 1. To continue
Non-short circuit proof transformers must be protected against short circuits and overloads. To continue
Static machine operating with alternating current having two or more windings which, through the principle of flux variation through time, transforms one voltage and current system into a system with different values although at the same frequency, in order to transmit electrical energy. To continue