Pilot Line

A cord or rope used to pull a heavier rope that will be used to pull a conductor into place.

Pilot Channel

A means of interconnecting between relaying points for the purpose of protection.

Pick up ratio

The ratio of the limiting values of the characteristic quantity at which the relay resets and operates. This value is sometimes called the differential relay. Pick up ratio

Photovoltaic System

A complete set of components for converting sunlight into electricity by the Photovoltaic process, including the array and balance of system devices. Photovoltaic System