Three-phase transformers

Three-phase transformers
Three-phase transformers

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A major advantage of alternating and three-phase current compared to direct current is that it is possible to generate electrical energy economically in large power plants, transmit it at high voltage over long distances with low losses and then make it available to the consumer at a level that suits him or her. This is achieved by using transformers.

With this equipment set, a three-winding transformer consisting of three individual poles with different switching options of the primary side and variable secondary voltage is examined. The third winding (tertiary winding) is provided as a so-called triangular balancing winding for the case of an unbalanced load.

Learning objectives

  • Behaviour of a three-phase transformer under short circuit, no-load and load (RLC)
  • Calculation of the equivalent circuit of a transformer from measurements
  • Behaviour under unbalanced load and influence of the balancing winding
  • Demonstration of an autotransformer

Through measurements and calculations, the learner should understand and determine the behaviour and characteristics of a transformer.

Target groups

Pupils in vocational training in power engineering. Training in the field of power plant technology in industry. Students in general electrical engineering and power engineering. Levels up to a bachelor's degree.

Knowledge of three-phase or alternating current technology is a prerequisite.


  • Behaviour during no-load operation
  • Behaviour during short circuit
  • Behaviour during load operation
  • Behaviour under unbalanced load
  • Determination of the zero impedance
  • Demonstration of an autotransformer

Components of equipment sets

1 74550  8  Three-Phase Transformer TL380KV LD
1 773361 Controllable resistive load, 1.0 LD
1 773363 Controllable capacitive load, 1.0 LD
1 773364 Controllable inductive load LD
(not included in the total price)
1 73311  4  Capacitive load 1.0 LD
1 565091  4  LIT-print: Three-Phase Transformer, German LD
1 775370EN  4  LIT-print: Three-Phase Transformer LD
Measuring instruments, with digital measurement CASSY:
1 727111 Power Analyser CASSY Plus LD
1 524222 * CASSY Lab 2 for Drives and Power Systems LD

Alternativ option to  measuring instruments above:

Measuring instruments, with digital measurement CASSY and oscilloscope operation:

1 575302 Oscilloscope 30 MHz, digital, PT1265 LD
2 575231  8  Probe 100 MHz, 1:1 / 10:1 LD

Conventional measuring instruments:

alternativ option to CASSY measuring instruments above

2 72711  4  Power meter LD
1 72712  4  Power factor meter LD
1 72731  8  Moving Iron Meter 1 A LD
1 72732  4  Moving iron meter, 2.5 A LD
1 72738  8  Moving Iron Meter 600 V LD
1 72739  4  Moving Iron Meter 100/400 V LD
Power supply:
1 725442DG Three-phase voltage 400 V/2.5 A LD
1 726256  8  Panel frame VT160, three-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 500592  8  Safety bridging plugs with tap, black, set of 10 LD
1 500851  4  Safety experiment cables, 32 A, set of 32 LD
1 500852  8  Safety connecting leads, 32 A, yellow/green, set of 10 LD
4 500641  8  Safety experiment cable, 100 cm, red LD
4 500642  4  Safety experiment cable, 100 cm, blue LD
2 500647  4  Safety connection lead 100 cm brown LD
2 5006481  4  Safety connection lead 100 cm grey LD
6 500614  4  Safety experiment cable, 25 cm, black LD
6 500624  4  Safety experiment cable, 50 cm, black LD
Additionally recommended:
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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