This equipment is used to investigate the operation and stationary operating behaviour of a synchronous machine with a multifunction machine. The basic tests are divided into motor and generator tests. Numbers 1 to 10 are basic motor tests and numbers 11 to 20 are basic generator tests. The additional tests are listed in the order in which they were developed.
The tests are carried out with industrially manufactured machines. All test machines have a special base for connection to the Machine Test System 0.3. The Machine Test CASSY records all measured values of the AC machines. The measured values can be displayed directly on the built-in display as individual values, a table of a measurement series or a diagram. The measurements can be taken without additional software, and the measurement data can be stored locally on the device. The characteristics of the test machines are recorded using the Machine Test CASSY. Some of the test machines are powered directly from the public supply network. Depending on the experiment, the synchronous machine is operated as a generator in an isolated network or in the interconnected network.
Learning objectives
- Protective measures and electrical safety
- Setup and commissioning of electrical machines
- Use of starting circuits
- Efficiency of the machine
- Evaluation of characteristic curves of electrical machines
- Characteristic curves in generator operation
The main area of application for synchronous machines is energy generation. They are also used as commutated synchronous machines in drive control systems. In recent years, commutated synchronous machines have been used in e-mobility. Full-pole generators are used in gas and steam power plants, which require a low number of pole pairs at high speeds. This type of rotor is better able to withstand the centrifugal forces generated in this process. The full-pole generator is the preferred choice for large thermodynamic power plants.
Highlights
- To protect against overheating, the stator windings of the test machines are equipped with temperature sensors.
- In the event of overheating, the machine test system switches off the load of the test machine, thereby maintaining air cooling. This prevents damage to the test machines.
- The test machines have a didactic terminal board with the winding diagram printed on it.
- All winding ends are connected to safety sockets (4 mm) on the terminal board.
- Computer-assisted measurement data acquisition provides meaningful measurement results.
- The arrangement of the 4 mm safety sockets complies with the standards for industrial motors.
All functions of the CASSY 0.3 machine test can be quickly operated directly via the display, the rotary wheel and the buttons on the device. All settings and measurement results can be stored on the device and quickly retrieved later or easily downloaded.
In addition, the CASSY 0.3 machine test can be controlled completely 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 CASSY 0.3 machine test for the local media connection of at least four end devices simultaneously.
For more details, please refer to product data 7731900 or 7731901 Machine Test CASSY 0.3.
The equipment is equally suitable for student experiments in the laboratory with low voltage (230/400 V three-phase current) and on a mobile test bench – for teacher demonstrations in the classroom or lecture hall. The experimental procedure of the experiments occurs interactively as LabDoc, as an HTML file or as a PDF document.
The target group is trainees in the commercial sector and students of electrical engineering. The course offers medium-level experiments for vocational schools and at the same time provides the necessary insights into machine behaviour for scientific interpretation in bachelor's degree programmes. Thanks to the media connection, the experiments are suitable for demonstration in the classroom or lecture hall.
The following equipment sets include additional experiments with synchronous machines:
- E2.2.5.1 Shunt-wound motor
- E2.2.5.2 Full-pole motor
Topics Synchronous motor
- Start-up with pony motor
- Torque and load
- Starting procedure for synchronous motors
- Efficiency in motor operation
Topics related to synchronous generators
- No-load characteristic curve
- Short-circuit characteristic curve
- Excitation of the synchronous machine
- Operating behaviour
- Rotor current and torque
- Synchronisation and parallel connection
- Efficiency in generator operation
- V-curve in generator operation
This document contains a table of contents and thus defines a course between whose chapters you can navigate freely.
Each entry in the table of contents is a chapter of the course. The order of the chapters is determined by the table of contents. The first chapter is always the table of contents itself.
