Three-phase transformer, 0.3

Three-phase transformer, 0.3
Three-phase transformer, 0.3


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


  • Protective measures and electrical safety
  • Set-up of power generation systems according to circuit diagrams
  • Use of a power analyser as a measuring device

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.


The measurements are carried out with a power analyser, which also makes it possible to measure the phase shift between 2 measuring channels. This is needed for the analysis of the different circuits and the connection symbol.

All functions of the Power Analyser CASSY can be operated quickly and directly via the display, the rotary wheel and the buttons on the unit. All settings and measurement results can be saved on the unit and quickly called up again later or simply downloaded.

In addition, the Power Analyser CASSY is fully controllable in real time via RJ45 Ethernet, W-LAN and USB-C interfaces.

These interfaces can be used by the following software:

  • CASSY Lab 2 for drives and energy systems,
  • MATLAB® and LabVIEW ™
  • Lab Docs Editor Advanced

The following integrated servers are available in the Power Analyser CASSY for the local media connection of at least four end devices simultaneously.

For more details, see product data 727110 or 727111 Power Analyser CASSY.

The individual equipment is equally suitable for student experiments in the laboratory with low voltage (230 / 400 V three-phase current) and - with a mobile trainer - for teacher demonstration in the classroom. The experiments are carried out according to the manual.

The target group is made up of commercial apprentices and students of electrical machine construction. The course offers experiments at an intermediate level and also allows for the necessary insight into machine behaviour for scientific interpretation at undergraduate level. The media connection makes the experiments suitable for demonstration in the classroom or a lecture hall.

In the following configurations there are further extended experiments with transformers:

  • E2.2.1.2 Scott transformer
  • E2.2.1.3 AC transformer
  • E2.2.1.4 AC toroidal core transformer
  • E2.2.1.5 AC auto-transformer


  • Voltage equations and equivalent circuits
  • Measurement without load, with load and with a short-circuit
  • Determination of self-inductance, magnetic coupling and leakage
  • Losses, changes in voltage and efficiency
  • Circuits and vector groups for three-phase transformers
  • Simultaneous operation of multiple three-phase transformers

Main components:

Components of equipment sets

1 73390 3-phase transformer, 0.3 LD
1 773360 Controllable resistive load, 0.3 LD
1 773362 Controllable capacitive load, 0.3 LD
1 773364 Controllable inductive load LD
1 775185DE  4  LIT: Transformers, 0.3 LD
1 775185EN  4  * LIT: Transformers 0.3 LD
Measuring instruments, with digital measurement CASSY:
1 727110  8  Power Analyser CASSY Plus LD
1 524222 CASSY Lab 2 for Drives and Power Systems LD
Power supply:
1 725442DG Three-phase voltage 400 V/2.5 A 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 500855  4  Safety experiment cables, 32 A, set of 34 LD
1 500856  4  Safety experiment cables, 32 A, yellow/green, set of 5 LD
Additionally required:
PC with Windows 7/8/10

Articles marked with * are not essential, we do however recommend them to carry out the experiment.

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