What is the purpose of a differential relay in protection systems?

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Question: What is the purpose of a differential relay in protection systems?

Options:

Correct Answer: To compare currents in two circuits

Solution:

Differential relays compare the currents entering and leaving a protected zone to detect faults.

What is the purpose of a differential relay in protection systems?

What is the purpose of a differential relay in protection systems?

Step 1: Understand that a differential relay is a device used in electrical systems.
Step 2: Know that it monitors the current flowing into a specific area, called a protected zone.
Step 3: Recognize that it also monitors the current flowing out of that same area.
Step 4: Compare the incoming and outgoing currents. Under normal conditions, these currents should be equal.
Step 5: If the incoming current is different from the outgoing current, it indicates a problem, like a fault.
Step 6: The differential relay then triggers an alarm or disconnects the system to prevent damage.

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