What is the primary purpose of testing individual transformers in a 3-phase bank?

The primary purpose of testing individual transformers in a 3-phase bank is to find a bad transformer. Testing each transformer independently allows for the identification of any performance issues, malfunctions, or faults that may be affecting the overall functionality of the transformer bank. This process is crucial for maintaining reliability and operational efficiency since a faulty transformer can lead to imbalances, overheating, or failure within the system, potentially affecting the entire three-phase power supply.

By isolating the performance of each transformer, technicians can pinpoint which unit is underperforming or failing, enabling timely repairs or replacements before a more significant outage or issue occurs. This proactive approach ultimately ensures the stability and safety of the electrical system, making it essential for effective maintenance practices.