Pilot and Numeric Relaying

Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV rating...

Pilot relaying, a form of differential protection, utilizes communication channels to compare terminal quantities on widely spread transmission lines. It is typically applied to shorter lines, rated between 69 and 115 kV.

Four communication channels are used, with two primary fault detection methods: directional comparison, to assess powe...