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Two-coiled structure 

Two-coiled transformer

A two-coiled transformer always has separate primary and secondary coils that are not electrically connected. This type of transformer is used when reliable galvanic separation is required between the primary and secondary sides.

 a) One primary and one secondary coil

use:

  • decreasing voltage
  • increasing voltage
  • isolation transformer
Muuntajan kaksikäämirakenne

 

b) Primary coil with intermediate output and one secondary coil

This structure is used for several separate primary voltages and one secondary voltage.

Muuntajan kaksikäämirakenne usealla ensiöjänniteellä

 

c) One primary coil and one secondary coil with intermediate output

When this type of transformer is used, only one output is loaded at any one time.

Muuntajan kaksikäämirakenne usealla ulosotolla

Example: The primary coil has a nominal voltage of 230V. The secondary side has one 100V coil with two intermediate outputs. Their nominal values are 75V and 50V. Only one secondary coil output is loaded at any one time with a 1A current. Secondary coil power or the transformer power is as follows:

  • 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

Muuntaja

Example: The primary coil has a nominal voltage of 230V. The secondary side has three separate coils with the following nominal values: 24V 1A, 12V 2A and 18V 2A. The combined power of the secondary coils or the transformer power is as follows:

P2 = (24V x 1A) + (12V x 2A) + (18V x 2A) = 84 VA

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