Quiz: Protective Relays

What do protective relays do?

• Prevent overheating of electrical equipment

• Regulate the flow of electricity

• Monitor electrical parameters and detect abnormalities

• Control the voltage in electrical systems

What is the main function of overcurrent relays?

• Detect current leakage to ground

• Detect abnormally high voltage

• Detect abnormally low voltage

• Detect excessive current

What is the purpose of ground fault relays?

• Detect excessive current

• Detect abnormally low voltage

• Detect current leakage to ground

• Detect abnormally high voltage

What are the components of a relay?

• Coil, armature, and contacts

• Transformer, resistor, and capacitor

• Diode, transistor, and resistor

• Inductor, capacitor, and switch

What tool is needed to test a relay?

• Oscilloscope

• Logic analyzer

• Function generator

• Digital multimeter

What is the role of a solid-state relay?

• Detect abnormally high voltage

• Detect excessive current

• Use semiconductors to switch current

• Use a coil and armature to operate

How do protective relays enhance safety?

• By decreasing the flow of electricity

• By increasing voltage in electrical systems

• By mitigating electrical hazards like fire and explosions

• By reducing the number of circuit breakers

What is the future trend in protective relays?

• Reduced communication capabilities

• Decreased protection schemes

• Integration with SCADA systems

• Decreasing use of microprocessor-based relays

What is the function of comparators in a relay?

• Compare preset values

• Generate magnetic fields

• Trigger trip outputs

• Activate circuit breakers

Why are protective relays crucial for modern society?

• To decrease the reliability of power delivery

• To enhance safety and ensure grid stability

• To maximize downtime

• To increase equipment damage