HV Disconnector Switches
♦ Centre Break
The center-break disconnector has two contact arms open and closes the circuit at the midpoint between two insulators.
This is the most commonly used and cheap type of disconnector in the substation due to its design.
♦ Rated voltage: up to 550 kV
♦ Rated continuous current: up to 6300 A
♦ Rated short-time withstand current: up to 63 kA
♦ Double Break
The double-break disconnector has one arm moved by the central insulator supporting it and closes the circuit on two fixed contacts, each of them placed on one of the two side insulators.
♦ Rated voltage: up to 550 kV
♦ Rated continuous current: up to 6300 A
♦ Rated short-time withstand current: up to 63 kA
♦ Vertical Break
The vertical-break disconnector . one side connected to support and another side of the contact move vertically and open to consists of one arm which, by moving on the plane of the insulators supporting it.
The vertical operating mechanism makes phase-to-phase spacing is minimized. It is a good solution for mobile substations and special applications.
♦ Rated voltage: up to 550 kV
♦ Rated continuous current: up to 6300 A
♦ Rated short-time withstand current: up to 63 kA
♦ Pantograph
The pantograph disconnector has two joined half-arms and they are moving in vertically on the plane of the insulators, close the circuit on a fixed contact connected to the upper busbar.
Pantograph disconnectors allow minimizing the substation area and ensure the maintenance of the bay without putting the upper busbar out of service.
♦ Rated voltage: up to 550 kV
♦ Rated continuous current: up to 6300 A
♦ Rated short-time withstand current: up to 63 kA