Why is it important to test each transformer individually rather than as a group?

Testing each transformer individually is vital because it allows for the accurate identification of faulty units. When transformers are tested as a group, any issues may be masked by the performance of the other units, potentially leading to misdiagnosis of problems. Individual testing ensures that each transformer's operational characteristics are assessed, making it easier to pinpoint any defects or malfunctions. This not only aids in maintaining system reliability but also prevents further complications that could arise from overlooked faulty transformers.

The focus on accurately identifying issues is essential in preventing downtime and ensuring that the entire system operates efficiently. By doing so, maintenance can be more targeted and effective, leading to improved overall performance and longevity of the transformers involved in the system.