Electricaltacnician Interview Questions and Answers

Onan and ONAF are two cooling methods used in transformers.

• ONAN stands for Oil Natural Air Natural, while ONAF stands for Oil Natural Air Forced.

• ONAN is a self-cooling method where the transformer is cooled by natural convection of oil and air, while ONAF uses fans to force air over the transformer.

• ONAF is more efficient than ONAN, but also more expensive.

• ONAF is used in transformers where the ONAN method is not sufficient to dissipate the heat generated.

• The choice between ON...read more

Transformer simulation test is conducted to ensure the proper functioning of the transformer under different conditions.

• To verify the transformer's ability to withstand overloads and short circuits

• To determine the transformer's efficiency and voltage regulation

• To identify any potential issues with the transformer's insulation or winding

• To ensure the transformer meets industry standards and specifications

• Examples of tests include short circuit test, open circuit test, and load...read more

PRV is used in transformers to regulate the voltage and protect the equipment from overvoltage.

• PRV stands for Pressure Relief Valve.

• It regulates the voltage and maintains it within safe limits.

• It protects the transformer from overvoltage and prevents damage to the equipment.

• PRV is installed on the transformer tank and is designed to release excess pressure in case of an overvoltage event.

• It is a safety feature that ensures the longevity and reliability of the transformer.