In the two-way direction there is always a separate primary and secondary winding (primary and secondary) which are not interconnected by electronic means. Such transformers are used when a reliable galvanic separation between the primary and secondary sources is required.
a) One primary and one secondary coil
- Voltage reduction
- Voltage Increase
- Isolation transformer
b) Primary coil with intermediate output and one secondary coil
The structure is applied to several separate primary voltages and one secondary voltage.
c) One primary coil and one secondary coil with intermediate output
In the use of such transformers, only one single outlet is loaded at a time
Example: The primary coil is a nominal voltage of 230V. The repeater has one 100V coil with two seizure. Their nominal values are 75V and 50V. Only one of the secondary windings is loaded at a time with a current of 1A. The power of the secondary windings, i.e. the power of the transformer, is:
- P1 = 100v x 1a = 100 VA
- P2 = 75v x 1a = 75 VA
- P3 = 50v x 1a = 50 VA
d) One primary coil and multiple secondary coils with simultaneous loading
Example: The primary coil is a nominal voltage of 230V. The repeater has three separate windings with nominal values: 24V 1A, 12V 2A and 18V 2A. The combined power of the secondary windings, i.e. the power of the transformer is:
P2 = (24V x 1A) + (12V x 2A) + (18V x 2A) = 84 VA