Research on on-line monitoring method for losses of distribution transformer in the case of single-phase grounding condition

Online monitoring of the operating losses of distribution transformers can reflect their operational status. This study proposes an online monitoring method that considers the losses of distribution transformers under single-phase grounding conditions. Firstly, a transformer transient model was built in PSCAD software to analyze the loss characteristics of distribution transformers after single-phase grounding occurs in a neutral. Then an algorithm for online monitoring of transformer iron loss and three-phase copper loss values using operating voltage and current data was proposed. Finally the loss values through experiments under two operating conditions and was calculated to conduct online monitoring. The experimental results show that the monitoring method considers the system's applicability during single-phase grounding operation and is robust to load fluctuations.