Noida Power Company Senior Executive Interview Questions, Process, and Tips

Copper taping in HT cables provides shielding against electromagnetic interference and helps in grounding.

• Copper taping in HT cables acts as a shield to protect against electromagnetic interference.

• It helps in grounding the cable to prevent electrical hazards.

• The copper taping also provides mechanical protection to the cable.

• Example: Copper taping is commonly used in high voltage power cables to ensure reliable transmi

If copper taping becomes brittle, it may lead to poor electrical conductivity, increased risk of breakage, and potential failure of the system.

• Poor electrical conductivity may result in signal loss or interference.

• Increased risk of breakage can lead to physical damage to the system.

• Potential failure of the system may require costly repairs or replacements.

• Brittle copper taping may also indicate corrosion or degradation

Busbars are shaped rectangular instead of cylindrical for better heat dissipation and easier installation.

• Rectangular shape provides more surface area for heat dissipation

• Easier to stack and connect rectangular busbars in electrical panels

• Rectangular shape allows for more efficient use of space in the panel

• Cylindrical shape would be harder to install and connect in a panel

Gravelling in substations is used to provide a stable surface for equipment installation, reduce the risk of electric shock, and prevent weed growth.

• Provides a stable surface for equipment installation

• Reduces the risk of electric shock by providing insulation

• Prevents weed growth around the equipment

• Improves drainage and reduces the risk of flooding

• Helps in maintaining a clean and organized substation environment

Preventive maintenance involves checking various components to ensure they are in good working condition.

• Inspecting and cleaning filters to ensure proper airflow

• Checking and replacing worn out belts and hoses

• Testing and replacing batteries if necessary

• Inspecting and lubricating moving parts

• Checking for leaks and addressing them promptly

The size of conductor in 33 KV is typically around 185 mm^2 for aluminum and 120 mm^2 for copper.

• Conductor size for 33 KV is usually around 185 mm^2 for aluminum and 120 mm^2 for copper

• The size may vary based on specific requirements and regulations

• Larger conductors may be used for higher current carrying capacity

The dimensions of an 11 KV VCB vary depending on the manufacturer and model, typically ranging from 600mm x 400mm x 200mm to 800mm x 600mm x 300mm.

• Dimensions can vary based on manufacturer and model

• Common dimensions range from 600mm x 400mm x 200mm to 800mm x 600mm x 300mm

• VCB stands for Vacuum Circuit Breaker