RL Series Load Break Switch

The RL Series three phase load break switch can be used as the switchgear component for an AS using the PowerLogic ADVC Controller. It can also operate independently of a controller as a manual load break switch or sectionaliser.

The RL Series cannot be used as the switchgear component for an ACR primarily because it is not designed to break fault current.

The RL Series Load Break Switch is a pole or pylon mounted, gas insulated three phase Load Break Switch (LBS)/Sectionaliser optimized for remote control and automation schemes.

Using a puffer interruption system insulated by SF₆ gas and enclosed in a sealed-for-life 316 Marine Grade stainless steel tank helps to ensure a long, low-maintenance service life. A fully insulated cabling system and a simple pole hanging arrangement all contribute to a quick, low cost installation.

The actuation of the Load Break Switch can be achieved in two ways:

• Manually – by use of a hook-stick to pull on an external operating lever.

• Electronically – with the addition of a motor pack mounted on the switch and operated via the PowerLogic ADVC Controller.

The interrupters are ganged together and driven by an over-centring spring mechanism which is operator independent so that it does not matter how fast or slow the arm is moved by the operator.

Current transformer and voltage screens are embedded in the bushings. These send signals to the control electronics to monitor line current, earth current and phase to earth voltages. Combined with the additional Motor Pack the RL Series switchgear can integrate easily into a SCADA system.

Available in 15, 27 and 38 kV variations, the RL Series also has the option of attaching surge arresters and capabilities for monitoring internal SF₆ gas pressure through sensors and highly visible low pressure external indicator. There is also a high pressure release to help avoid explosions or detachment from the RL Series mountings.

The switchgear position is shown by a large, clearly visible indicator, which is attached to the external operating lever.

The PowerLogic ADVC interfaces to the switchgear via the control cable and connects to the Switchgear Cable Entry Module (SCEM) in the base of the tank. The SCEM uses non-volatile memory to store all relevant switchgear data such as calibration values, ratings and number of operations. The SCEM also provides electronic shorting of the CT’s and CVT’s in the event the control cable is disconnected while current is flowing through the switchgear.