A three-phase recloser is a type of electrical switch that is used to protect three-phase power lines from faults and disruptions. It is designed to automatically open and close in response to changes in the electrical current, voltage, or frequency on the power line. The purpose of a recloser is to isolate the faulted section of the power line and restore power to the rest of the line as quickly as possible.
The three-phase recloser is composed of three single-phase reclosers, one for each phase of the power line. Each single-phase recloser consists of a vacuum interrupter, a control unit, and a current sensor. The vacuum interrupter is responsible for opening and closing the circuit, while the control unit monitors the electrical parameters and controls the operation of the recloser. The current sensor measures the flow of current on the power line and provides feedback to the control unit.