Senior Electrical Design Engineer Interview Questions and Answers

Power transformers are used to step up or step down voltage for transmission and distribution transformers are used to distribute power to end-users.

• Power transformers are typically used in power generation plants and substations.

• Distribution transformers are used to supply power to residential, commercial, and industrial areas.

• Power transformers have higher voltage ratings and are designed for long-distance transmission.

• Distribution transformers have lower voltage ratings an...read more

The factor of wire selection is determined by the current carrying capacity, voltage rating, insulation material, and environmental conditions.

• Current carrying capacity: Ensure the wire can handle the maximum current without overheating.

• Voltage rating: Select a wire with a voltage rating higher than the system voltage.

• Insulation material: Choose the appropriate insulation material based on temperature and environmental factors.

• Environmental conditions: Consider factors like m...read more

The required materials for designing a transformer include a magnetic core, copper wire, insulation materials, and cooling systems.

• Magnetic core: Typically made of laminated iron or steel to provide a low reluctance path for the magnetic flux.

• Copper wire: Used for winding the primary and secondary coils to carry the electrical current.

• Insulation materials: Used to insulate the copper wire and prevent short circuits.

• Cooling systems: Required to dissipate heat generated during ...read more

CT and PT are electrical devices used for measuring current and voltage in power systems.

• CT stands for Current Transformer and is used to measure high currents by stepping down the current to a lower value.

• PT stands for Potential Transformer and is used to measure high voltages by stepping down the voltage to a lower value.

• CTs and PTs are commonly used in power distribution systems to provide accurate measurements for protection and control purposes.

CT burdens refer to the impedance or resistance that a current transformer (CT) presents to the secondary circuit.

• CT burdens are typically expressed in ohms and represent the load that the CT must drive.

• The burden impedance can affect the accuracy of the CT's output signal.

• Common CT burdens include resistors, relays, meters, and other devices connected to the CT's secondary circuit.

• It is important to match the CT burden with the CT's rating to ensure accurate measurements.