Scott transformer, 0.3

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

Objectives

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

This individual equipment set allows for investigation of a Scott transformer. Scott transformers are made by connecting together two different transformers with special windings. They are designed for transformation to and from a two-phase network with a 90° phase-shift to a three-phase network with 120° phase-shift. Its main field of application is measurement and protection technology.

 Highlights:

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.

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:

• E2.3.1.1 Three-phase transformer
• E2.3.1.3 AC transformer
• E2.3.1.4 AC toroidal core transformer
• E2.3.1.5 AC auto-transformer

Topics

• 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