Maharashtra State Electricity Distribution Company Substation Operator Interview Questions and Answers

The term 'soul of the substation' is used to emphasize the importance and central role of the substation in the power distribution system.

• The substation is considered the heart of the power grid, as it plays a crucial role in transforming and distributing electricity to different areas.

• Just like the soul is essential for the functioning of a living being, the substation is essential for the functioning of the power system.

• Referring to the substation as the 'soul' highlights i...read more

My initial response to a technical problem in the substation would be to assess the situation, identify the root cause, and take immediate action to resolve the issue.

• Assess the situation by checking equipment status and alarms

• Identify the root cause through troubleshooting and analysis

• Take immediate action to isolate the problem area and restore normal operations

• Communicate with team members and supervisors to coordinate efforts and seek assistance if needed

Various safety tools include personal protective equipment, lockout/tagout systems, warning signs, and emergency stop buttons.

• Personal protective equipment (PPE) such as hard hats, gloves, safety glasses, and high visibility clothing are essential for protecting workers from hazards.

• Lockout/tagout systems are used to ensure that equipment is properly shut off and not turned on accidentally while maintenance work is being performed.

• Warning signs are placed in strategic locatio...read more

Different types of earthing include solid earthing, resistance earthing, and reactance earthing. Earthing is necessary for substations to provide a path for fault currents to flow safely to the ground.

• Solid earthing: Direct connection of the electrical system to the ground with low impedance.

• Resistance earthing: Introducing resistance in the earthing system to limit fault current.

• Reactance earthing: Using inductive or capacitive reactance to limit fault current.

• Earthing is ne...read more

The frequency of AC supply used at our substation is 60 Hz.

• The frequency of AC supply at our substation is 60 Hz.

• The standard frequency for AC power in most regions is 60 Hz.

• Frequency can vary in different countries, with some using 50 Hz instead of 60 Hz.

Star point of power transformer is earthed to provide a reference point for the system and to ensure safety.

• Earthing the star point helps in providing a reference point for the system voltage.

• It helps in stabilizing the system voltage during unbalanced loads.

• Earthing the star point also helps in providing a path for fault currents to ground, ensuring safety.

• It helps in reducing the risk of insulation breakdown and damage to the transformer.

• Earthing the star point also helps i...read more