E Transformatory toroidalne AC 1,0

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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.

A toroidal transformer is ring-shaped. The material used for the core can be soft iron or ferrite material. The shape means that there is very little magnetic scattering. However, the manufacturing process of the windings is more complex than in conventional transformer types. The switch-on current for toroidal transformers can be very high and in practice needs to be limited by suitable means.

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 toroidal transformers 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 toroidal transformer 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

733 98 AC toroidal core transformer 0.3 1
733 10   Resistive load 1.0 1
732 41 Capacitive load 0.3 1
732 42   Inductive load 0.3/1.0 1
531 282   Multimeter Metrahit Pro 3
727 12   Power factor meter 1
726 09   Panel frame T130, two-level 1
726 85   Adjustable transformer 0…260 V 1
500 59   Safety bridging plugs, black, set of 10 2
500 591   Safety bridging plugs, yellow/green, set of 10 1
500 851   Safety connecting leads, 32 A, set of 32 1
500 852   Safety connecting leads, 32 A, yellow/green, set of 10 1
569 2001L   LIT: Transformers (in German) T 10.1 1
569 2001S   LIT: Transformers (in German) T 10.1 1
569 2002   * LIT: Transformers (in English) T 10.1 1

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



Firma produkuje zestawy edukacyjne do kształcenia akademickiego oraz szkolenia zawodowego z zakresu fizyki, chemii, biologii oraz elektroniki, elektrotechniki, automatyki, telekomunikacji, maszyn elektrycznych, odnawialnych źródeł energii i fotoniki, jest częścią grupy LD Didactic.