Protection against over voltages

What causes overvoltages in the power system?

• a) Lightning strikes

• b) Faults and short circuits

• c) Switching operations

• d) All of the above

What is the primary purpose of protection against overvoltages in the power system?

• a) Increase power generation capacity

• b) Improve power quality

• c) Reduce power losses

• d) Prevent equipment damage

Which of the following is a commonly used protective device against overvoltages?

• a) Surge arresters

• b) Capacitors

• c) Circuit breakers

• d) Transformers

How do surge arresters protect against overvoltages?

• a) By diverting excess voltage to ground

• b) By increasing power system stability

• c) By reducing line losses

• d) By adjusting power factor

Which equipment in the power system is typically protected by surge arresters?

• a) Transformers

• b) Circuit breakers

• c) Insulators

• d) All of the above

What is the purpose of voltage regulators in protection against overvoltages?

• a) To increase power factor

• b) To reduce line losses

• c) To stabilize voltage levels

• d) To enhance power generation capacity

Which of the following is a technique used for protection against overvoltages?

• a) Insulation coordination

• b) Load shedding

• c) Power factor correction

• d) Fault detection

What is the role of fuses in protection against overvoltages?

• a) To interrupt the power supply during overvoltages

• b) To regulate power factor

• c) To reduce line losses

• d) To enhance power transmission efficiency

Which of the following is an example of a protective relay used for overvoltage protection?

• a) Differential relay

• b) Distance relay

• c) Overcurrent relay

• d) Voltage relay

How can proper grounding contribute to protection against overvoltages?

• a) By increasing power system stability

• b) By reducing line losses

• c) By providing a path for fault current and overvoltages to dissipate

• d) By improving power quality