Function of Conductor / Insulation Screen:

The conductor shield is a layer of semi-conducting material. Semi-conducting materials do not conduct electricity well enough to be a conductor but will not hold BACK voltage.

It “smoothes” out the surface irregularities of the conductor. The conductor shield makes the voltage on the inside of the insulation the same. Industry specifications define the performance of conductor shield. Good insulation shields are extruded in tandem with the insulation.

The insulation shield CONSISTS of two components. These components are the extruded (auxiliary) shield and the metallic (PRIMARY) shield.

The extruded shield consist of a semi-conducting layer similar to the conductor shield. It makes the voltage on the outside of the insulation the same.

The primary shield can consist of metal tape, drain wires or concentric neutral (CN) wires. Grounding the primary shield makes the voltage on the outside of the insulation ground. The Copper of the shield is usually bare, but may be coated with lead or tin. Some primary shields consists of drain wires and tape. Aluminium and lead can also be used as the shield.

Concentric neutral wires serve a two-fold purpose. They function as the metallic component of the insulation shield and as a conductor for the neutral return current. Their cross SECTIONAL area must be sized in order to function as the neutral conductor.

Cables with PVC Insulation: The inner conducting layer consists of PVC compound having high carbon BLACK content. For the outer conducting layer, a cover of conducting tapes is preferred.

Cables with PE or XLPE Insulation: Because of higher sensistivity to partial discharge the reliable well adhesive gap and cavity free bonding to conducting layers is of greatest significance. The inner conducting layer consists of polymer compound made conductive by adding carbon black. And the outer conducting layer is formed by semi-conducting compound along with semi-conducting tapes.

Function of Conductor / Insulation Screen:

The conductor shield is a layer of semi-conducting material. Semi-conducting materials do not conduct electricity well enough to be a conductor but will not hold back voltage.

It “smoothes” out the surface irregularities of the conductor. The conductor shield makes the voltage on the inside of the insulation the same. Industry specifications define the performance of conductor shield. Good insulation shields are extruded in tandem with the insulation.

The insulation shield consists of two components. These components are the extruded (auxiliary) shield and the metallic (primary) shield.

The extruded shield consist of a semi-conducting layer similar to the conductor shield. It makes the voltage on the outside of the insulation the same.

The primary shield can consist of metal tape, drain wires or concentric neutral (CN) wires. Grounding the primary shield makes the voltage on the outside of the insulation ground. The Copper of the shield is usually bare, but may be coated with lead or tin. Some primary shields consists of drain wires and tape. Aluminium and lead can also be used as the shield.

Concentric neutral wires serve a two-fold purpose. They function as the metallic component of the insulation shield and as a conductor for the neutral return current. Their cross sectional area must be sized in order to function as the neutral conductor.

Cables with PVC Insulation: The inner conducting layer consists of PVC compound having high carbon black content. For the outer conducting layer, a cover of conducting tapes is preferred.

Cables with PE or XLPE Insulation: Because of higher sensistivity to partial discharge the reliable well adhesive gap and cavity free bonding to conducting layers is of greatest significance. The inner conducting layer consists of polymer compound made conductive by adding carbon black. And the outer conducting layer is formed by semi-conducting compound along with semi-conducting tapes.