Abstract

Transformer energization events occur frequently in electrical distribution systems and often appear in power quality recordings. These events can produce large transient currents and waveform distortions that may initially resemble faults or abnormal system conditions. Without proper interpretation, energization events may trigger unnecessary investigations or be misclassified in power quality monitoring systems. This paper explains the electrical behavior that occurs when transformers are energized and describes the characteristic waveform patterns that appear in power quality data.