JSW Steel Coated Products Electrical Maintenance Technician Interview Questions and Answers

The SLD (Single Line Diagram) is a graphical representation of the electrical system of a plant.

• SLD shows the electrical components and their interconnections in a simplified manner.

• It helps in understanding the power flow and control of the plant.

• SLD includes transformers, generators, switchgear, motors, and other electrical equipment.

• It also depicts protection devices, control circuits, and communication systems.

• SLD ...read more

Impedance voltage of a transformer is the voltage drop that occurs across the transformer's impedance when a current flows through it.

• Impedance voltage is a result of the transformer's internal impedance.

• It is caused by the resistance and reactance of the transformer's windings and core.

• Impedance voltage can be calculated by multiplying the current flowing through the transformer with its impedance.

• It represents the vo...read more

To test IGBT in an a.c drive, perform insulation resistance test, gate voltage test, and current-voltage characteristics test.

• Perform insulation resistance test to check for any leakage or insulation breakdown.

• Conduct gate voltage test to ensure proper functioning of the gate driver circuit.

• Test the current-voltage characteristics to verify the IGBT's performance under different load conditions.

• Use an oscilloscope to a...read more

The P.I test in transformers is performed to determine the insulation condition and losses in the transformer.

• P.I test stands for Polarization Index test.

• It is a type of insulation resistance test.

• The test measures the ratio of insulation resistance at 10 minutes to the insulation resistance at 1 minute.

• The test helps in assessing the insulation condition and detecting any moisture or contamination in the transformer.

• A...read more