PARAMETER ESTIMATION OF THREE-PHASE TRANSFORMERS UNDER FULL LOAD CONDITION BY USING OPEN DELTA METHOD

• Main Author: Hajar Juliatiza, Siti
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/87021
• Institution: Institut Teknologi Bandung

The parameters in the transformer model describe the performance of the transformer under different conditions. Accurate values of the transformer equivalent circuit are necessary for effective monitoring of transformer performance. Generally, tests such as open circuit testing and short circuit testing are carried out to obtain transformer parameter values. However, the conventional method is inefficient because the tests are carried out alternately. This means that when the transformer is at the rated voltage, the current is not at the rated state, and vice versa. When the current is at the transformer rating, the voltage used is not at the transformer rating. This sequential approach does not reflect the actual operational state of the transformer, thus making the process inefficient and potentially less accurate. To overcome this inefficiency, this research proposes a transformer testing method under conditions close to actual operating conditions using the Open Delta method. The Open Delta method allows testing of transformers with current and voltage at the transformer rating to be tested simultaneously. Thus providing a more accurate representation of transformer performance. This method uses only one three-phase transformer, thus completing the testing process and increasing efficiency. In this paper, the details of the Open Delta test will be discussed. Simulation and experimental results will be presented to verify the proposed method compared with conventional methods. The Open Delta method was proven to be more efficient and representative of actual transformer operating conditions, thereby offering significant improvements over conventional testing approaches.