Auto Transformer Rectifier Unit of aircraft power system

Datsen Davies Tharakan

Introduction:
This design example illustrates an ATRU (Autotransformer Rectifier Unit) which is part of the typical aircraft power system. The ATRU is composed of three 6-pulse diode bridges and uses phase-shifting of the secondary voltages in the autotransformer. A three-phase 400 Hz voltage source is used to supply power to the ATRU. With the given frequency and amplitude ,three different sinusoidal signals (out of phase from each other by 120 degree) are created. With the help of autotransformer and diode rectifier units 18 pulses are generated. Phase to phase short at output rail and phase to ground short at one of the input phase is simulated for a particular duration to study the system effect under such fault condition. For more information please refer to the attached README file.

Circuit Snapshot:
Refer to the attached snapshot "ATRU.png".

How To Use:

1. Download the attached design folder "ATRU_18_pulse_design_unit.zip".
2. Extract the files to any location on your PC.
3. Invoke SaberRD.
4. Navigate to the directory where the unzipped file is available.
5. Open the file that has the extension, ".ai_dsn".
6. Perform the analysis as per the settings given in the Quick Analysis box inside the schematic and plot the signals listed to understand the behavior of the design.

For more information, please refer to README file available in the attached README.zip file.

Note:This example works only in SaberRD Commercial Edition.