Correct option is A
Merz Price protection is a type of differential protection. It's a percentage differential protection scheme that compares the current entering and leaving a protected zone to detect internal faults in alternators and power transformers.
Here's how Merz Price protection works:
· Normal conditions: The current entering and leaving the protected zone are the same.
· Fault: When a fault occurs, there's a difference between the currents. The Merz Price protection scheme detects this difference, or differential current, and triggers the operation of relay and circuit breakers.
