How do relays function in protecting distribution systems?

[Manon_Chaboud]

Relays are crucial for protecting distribution systems by spotting and isolating faults to prevent damage and maintain a reliable power supply.

They keep an eye on electrical parameters like current, voltage, and frequency. When these parameters move away from their preset values, the relay detects a potential fault.

Modern relays use digital or microprocessor-based technology to process signals, comparing the measured values with predefined settings to see if there’s an issue.

If a fault is found, the relay figures out if the circuit breaker needs to trip based on the fault's type and severity.

Relays are set up to ensure that only the faulty part gets isolated, keeping disruptions to a minimum.

This involves programming the relays to operate in a specific sequence and time frame.

Plus, relays can communicate with other protection devices and control systems, like SCADA, to provide real-time data and improve overall system protection.

Contactors& Protection Relays – Motor Starters | Schneider Electric