After identifying a bad transformer in a 3-phase bank, how many things should be checked on the nameplate?

When evaluating a transformer, it's essential to check specific information on the nameplate to ensure it meets the required operational parameters and specifications for your application. The nameplate typically provides crucial details such as the voltage ratings for primary and secondary windings, the transformer kVA (kilovolt-ampere) rating, and the frequency rating.

For a three-phase transformer, you would typically check the following four important aspects:

1. Primary Voltage Rating: This indicates the voltage level that should be applied to the primary side.

2. Secondary Voltage Rating: This shows the expected output voltage level from the secondary side.

3. kVA Rating: This value tells you the apparent power capacity of the transformer, which is critical for determining if the transformer can handle the load.

4. Frequency Rating: This specifies the frequency at which the transformer is designed to operate efficiently, usually 50 or 60 Hz.

Ensuring these four parameters align with system requirements and standards is vital for proper operation and safety. Checking these four elements ensures you have a comprehensive overview of the transformer's suitability and performance.