ItalianoGENERAL TECHNICAL INFORMATION
In order to correctly identify the product, the definitions in the European Standards EN 60742 and IEC 989 are given below
TRANSFORMER: Electromagnetic induction static device composed of two or more windings intended to transform an alternating current voltage system into another generally same system of values different and at the same frequency in order to transmit the electric power.
– Isolation: Transformer with a protective separation between input and output windings.
– Safety: Isolation transformer designed to power very low safety voltage circuits.
AUTOTRASFORMATORE: Particular execution of a transformer in which the windings are not galvanically separated but the only coil present, with the appropriate sockets, performs the dual function of primary and secondary winding.
INDUCTANCE: Wound component used on power lines to vary the characteristics relating to the
power factor and ripple.
REACTANCE: Wound element which, when inserted into the electric line, causes variations in programmed voltages and currents due to its reactive component, i.e. it generates electrical effects that are not in phase with those input.
IMPEDANCE : Wound component to be inserted in series with the electric line to obtain a more balanced overall load, also compensating for any excessive capacitive effects in the line.
VERY LOW SAFETY VOLTAGE: Voltage not exceeding 50V, effective value in alternating current, or 120V in flat direct current between conductors or between any conductor and the earth in a circuit separated from the mains by means of a safety transformer.
RATED POWER: It is the product of the rated secondary voltage by the rated secondary current or, in the case of polyphase transformers:
| root of n x V2 x I2 |
where:
|
n = number of phases V2 = secondary voltage I2 = nominal secondary current |
If the transformer has more than one secondary winding, or has multiple taps, the power is the sum of the products of the rated secondary voltage and the rated secondary current of the circuits that can be loaded simultaneously.
NO-LOAD POWER: It is the power absorbed by the transformer running on no-load and powered at the rated primary voltage and at the rated frequency.
RATED PRIMARY VOLTAGE: it is the supply voltage assigned by Belelli to the transformer for its specific operation.
RATED PRIMARY VOLTAGE RANGE: It is the range of primary voltages assigned to the transformer expressed by its lower and upper limits (230-400V).
RATED SECONDARY VOLTAGE: It is the secondary voltage assigned to the transformer when it is
supplied at the rated primary voltage, at the rated frequency, with the rated secondary current and
the rated power factor. Naturally this value is lower than the voltage measurable without
the application of the rated load. This voltage variation is in direct proportion to the impedance of the
transformer and the characteristics of the powered load.
SECONDARY NO-LOAD VOLTAGE: Secondary voltage of the transformer operating on no-load, at the rated primary voltage and at the rated frequency.
SHORT-CIRCUIT VOLTAGE: It is the voltage that must be applied to the primary winding so that the secondary winding, connected in short circuit, is traversed by an equal current current
nominal secondary, with windings at room temperature. The short circuit voltage is
usually expressed as a percent of the rated primary voltage.
RATED SECONDARY CURRENT: It is the secondary current, with nominal primary voltage and with nominal frequency, assigned by the manufacturer to the transformer for its specific operation. If the c