RL27 series - switch/ sectionaliser

The RL27 series switch features a fully welded SF6 insulated stainless steel enclosure containing load break switches, fault make puffer interruption device and rated up to 27kV, 630A, 16kA. The switch can be supplied as a basic manual unit or motor driven, with the motor pack available as an option. The enclosure contains a burst panel for internal fault overpressure relief, integrated into the gas enclosure.

The contacts are closed and opened by a conventional spring assisted manual mechanism, operated by means of an external operating arm or with the addition of a motor pack. Tripping and closing power for the motor is supplied by the control cubicle.

Epoxy bushings insulate the main circuit conductors from the outer case and provide the gas seal. Embedded voltage-sensing screens and current transformers provide outputs for measurement and current detection purposes. Cable termination solutions from 250A to 630A are available resulting in a switch/sectionaliser. This is suitable for connection into an insulated conductor system, or a bare conductor system, as appropriate.

An auxiliary voltage supply of 110, 220, 240, or 415 volts AC is required to power the automated unit; which may be derived from a local supply or where this is inconvenient, a voltage transformer can be provided.

The clearly visible external pointer shows the contact position. The recloser can be operated from the ground by a hookstick. External close/open inhibit by hookstick is also provided and a mechanical low gas pressure interlock included.

Mounting brackets for lightning arresters are optionally available.

Specification

• 27kV
• 630A
• 16kA fault rating
• 110, 220, 240 or 415V auxiliary power supply