E 2.1.1.2 Transformatory trójfazowe

Opis

The experiments are carried out using the STE plug-in system Electricity/Electronics.

Objectives

• Recognition of basic physical principles
• Implementation of electrical circuits according to circuit diagrams

Understanding three-phase transformers is one of the key requirements for working with three-phase loads. Three-phase transformers are AC transformers enhanced to handle three-phase current. The primary and secondary windings are provided with six terminals in each case. The vector group determines how the windings are connected, e.g. in a delta-star circuit. Knowledge of such vector groups is important for running multiple three-phase transformers simultaneously.

The equipment set incorporates student experiments which can be carried out in a laboratory safely using safety extra-low voltage. Experiment instructions are contained in a manual in either printed or digital form.

The target group is made up of students in general or vocational education. The experiments are designed as an introduction at a simple level of understanding.

For introductory and more advanced work, the following sets are recommended:

• E2.1.1.1 Electromagnetism & induction
• E2.1.1.3 Three-phase rectification
• E2.1.1.4 Generators and motors

Topics

• Fundamentals of three-phase technology
• Star configuration
• Delta configuration
• Measurement of voltage using multimeters and oscilloscopes
• Root-mean-square and peak values
• Phase-to-phase and line-to-line voltages
• Use of an oscilloscope in a three-phase system
• Measurement of current using a multimeter
• Determination of phase and generator power
• Delta circuits
• Connection of three-phase transformers in Yy configuration
• Quoting the vector group for transformers of different designs
• Connection of three-phase transformers in Dy configuration
• Connection of three-phase transformers in Yd configuration
• Connection of three-phase transformers in interconnected star (zig-zag) configuration
• Three-phase transformer without load
• Symmetrical load
• Asymmetric load between two live conductors
• Asymmetric load between live and neutral conductors
• Voltage transformation without a load
• Power for three-phase loads
• Phase shift without load between primary and secondary windings

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