Cable with shielding strip
The figure shows an electrical cable with conductors ( 1 ) of metal, surrounded by each of an inner conducting layer ( 2 ), insulation ( 3 ) and an outer conducting layer ( 4 ). A moisture barrier ( 11 ) with an electrically conducting layer surrounds the conductors. Shield strips ( 5 ) of at least partially conducting material are located in the regions between the outer conducting layer ( 4 ) and the moisture barrier ( 11 ). Electrically conducting shield wires ( 6 ) run along the shield strips and are placed through these into electrical contact with the electrically conducting layer of the moisture barrier ( 11 ). The shield strips support the moisture barrier from the inside, such that the moisture barrier can in a simple manner be made watertight when it is applied. The shield strips ( 5 ), the moisture barrier ( 11 ) and the shield wires ( 6 ) together constitute an efficient electrical shield for the cable. Penetration of an electrically conducting object into the cable results in a fault current that can be easily indicated, such that an applied cable voltage can be removed.
1. An insulated electrical cable that includes:
at least two electrical conductors of metal, each surrounded by an electrically insulating layer;
an electrical shield that surrounds the conductors outside of the insulating layer; and
a moisture barrier that surrounds the electrical shield;
at least two shield strips of the electrical shield, which are arranged in a region between the electrical conductors and the moisture barrier, which shield strips fill at least partially said regions, wherein the shield strips are of at least partially electrically conducting material, and wherein the shield strips are of a filler material that protects against corrosion and that may also have swelling properties on contact with water; and
shield wires of metal, which are arranged in the shield strips and which are in electrical contact with them;
wherein the moisture barrier includes a layer of electrically conducting material that is in electrical contact with the shield wires at least via the shield strips.
2. The insulated electrical cable according to claim 1 , wherein the moisture barrier has a join that extends along the cable, which join is in contact along at least part of its length with the shield strips and in this way can be pressed such that the join becomes tight and durable.
3. The insulated electrical cable according to claim 1 , wherein the shield wires are of aluminum.
4. The insulated electrical cable according to claim 1 , wherein the shield wires are of copper.
5. The insulated electrical cable according to claim 1 , wherein the conducting layer of the moisture barrier is of aluminum.
6. The insulated electrical cable according to claim 1 , wherein the conducting layer of the moisture barrier is of copper.
7. The insulated electrical cable according to claim 1 , wherein a layer is present under the moisture barrier that swells on contact with water.
8. The insulated electrical cable according to claim 1 , wherein the shield wires are arranged to be in direct electrical contact with the conducting layer of the moisture barrier.
9. The insulated electrical cable according to claim 1 , wherein the shield wires have a cross-section of pointed shape in order to facilitate opening of the cable construction.
10. An insulated electrical cable that includes:
at least two electrical conductors of metal, each surrounded by an electrically insulating layer;
an electrical shield that surrounds the conductors outside of the insulating layer; and
a moisture barrier that surrounds the electrical shield;
at least two shield strips of the electrical shield, which are arranged in a region between the electrical conductors and the moisture barrier, which shield strips fill at least partially said regions, wherein the shield strips are of at least partially electrically conducting material;
shield wires of metal, which are arranged in the shield strips and which are in electrical contact with them; and,
a layer under the moisture barrier that swells on contact with water;
wherein the moisture barrier includes a layer of electrically conducting material that is in electrical contact with the shield wires at least via the shield strips.