Transform Electricals

A Distance Protection Relay is a type of protective relay used in power systems to detect and isolate faults based on the impedance measured between the relay location and the fault point. It operates by measuring the voltage and current and calculating the apparent impedance; if the impedance falls below a preset threshold, indicating a fault within a defined zone, the relay trips the circuit breaker to isolate the faulty section. Distance relays are widely used for protecting transmission lines due to their fast and selective fault detection capability, improving system stability and minimizing outage impact.