protective schemes

What is the purpose of protective schemes?

• A. To prevent equipment damage and power outages
• B. To generate electricity
• C. To reduce energy consumption
• D. To increase power factor

What are the key components of protective schemes?

• A. Relays, trip coils, control circuits, and sensors
• B. Transformers, generators, and capacitors
• C. Conductors, insulators, and breakers
• D. Voltage regulators and inverters

What are some common problems that may occur with protective schemes?

• A. Improper coordination, malfunction, and false tripping
• B. Under-voltage, over-voltage, and frequency fluctuations
• C. Load imbalance, power factor correction, and harmonics
• D. Switching transients, lightning surges, and short circuits

What types of faults do overcurrent protective schemes protect against?

• A. Short circuits and overloads
• B. Overvoltage and under-voltage
• C. Phase imbalance and harmonics
• D. Transients and surges

How do directional protection schemes work?

• A. They detect the direction of fault currents and trip the corresponding circuit breakers
• B. They measure the phase difference between voltages and currents
• C. They analyze the time-current characteristics of protective devices
• D. They use distance relays to detect faults in the transmission line

Why is coordination important in protective schemes?

• A. To prevent maloperation and equipment damage
• B. To reduce the cost of protective devices
• C. To improve the power quality and stability
• D. To minimize the number of protective devices

Given a power system with multiple protective devices, which one should trip first in case of a fault?

• A. The device closest to the fault location
• B. The device farthest from the fault location
• C. The device with the shortest operating time
• D. The device with the highest trip level