AC Autotransformer, 0.3 kW

AC Autotransformer, 0.3 kW
AC Autotransformer, 0.3 kW

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The experiments are carried out using transformers on experiment panels in panel frames.


  • Protective measures and electrical safety
  • Set-up of power generation systems according to circuit diagrams
  • Use of commercial hand-held multimeters

Transformers are magnetically coupled systems used for transforming AC voltages or matching impedance. Transformers can therefore be used primarily for measurement or generation of electric power. These practical exercises study exclusively transformers used in energy generation. Transformer power ratings can range from a few mVA up to several MVA. The size and design also have an important effect on the transformer ratings. Transformers are regarded as electrical machines even though they contain no moving parts. The windings of three-phase transformers can be connected in a variety of circuit configurations.

Autotransformers are designed to save on materials. They are distinct from conventional transformers in that they have a single winding for the primary and secondary circuits which is tapped part way along. Autotransformers therefore do not have any galvanic isolation between the primary and secondary.

Students carry out the experiments as specified in the printed manual. Hand-held multimeters are used to measure the characteristics of the transformers. The graphical representation of the time course of the current and voltage is not essential. Thus multimeters are sufficient for measuring RMS values.

This individual equipment set allows for measurement of autotransformers under load (resistive, inductive, capacitive).

The target group is made up of commercial apprentices and students of power engineering. The course offers experiments at an intermediate level for vocational colleges and undergraduate level.

The equipment set utilises the 0.3 kW autotransformer and for economic reasons, it employs the 1.0 kW resistive load.


  • Voltage equation and equivalent circuit
  • Measurement without load, with load and with a short circuit
  • Determination of self-inductance, magnetic coupling and leakage
  • Losses, changes in voltage and efficiency

Similar to illustration

Main components:

Components of equipment sets

1 73399  8  AC autotransformer 0.3 LD
1 73310 Resistive load 1.0 LD
1 73241  8  Capacitive load 0.3 LD
1 73242  4  Inductive load LD
1 775220DE  4  LIT: E2.3.1.0 Transformers 1.0 (German) LD
1 775220EN  4  LIT: E2.3.1 Transformers 1.0 LD
1 524013S  8  Sensor-CASSY 2 Starter LD
2 5240431  4  30-A-Box LD
3 531282  8  Multimeter Metrahit Pro LD
1 72712  4  Power factor meter LD
Power supply:
1 72685  8  Adjustable transformer 0...260 V LD
1 72609  4  Panel frame T130, two-level LD
2 50059  8  Safety bridging plugs, black, set of 10 LD
1 500591  4  Safety bridging plugs, yellow/green, set of 10 LD
1 500851  4  Safety connecting leads, 32 A, set of 32 LD
1 500852  8  Safety connecting leads, 32 A, yellow/green, set of 10 LD
additionally required:
PC with Windows 7/8/10
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