H - Electricity – 01 – B
Patent
H - Electricity
01
B
18/753
H01B 13/14 (2006.01) H01B 7/28 (2006.01)
Patent
CA 1182966
TREE RESISTANT POWER CABLE Abstract An improved method and apparatus for fabricating insulated cables, particularly polymeric insulated electrical power cables, resistant to the formation and growth of electrochemical trees is disclosed. Internal pressure on the conductor side of the cable when it is maintained lower than the external pressure on the outer surface of the insulation during extrusion. Extrusion pressure higher than the external pressure results in expansion of the insulation following extrusion This expansion or swelling reduces the number and size of cracks and voids which are pre- cursors of electrochemical trees. In addition, pressure curing the extruded, insulated cable with a curing medium above its melting point followed by gradual gradient cooling under internal pressure and higher external cooling fluid pressure to around room temperature optimizes the resistance of the cable to nucleation and growth of electrochemical trees.
395089
Cable Technology Laboratories Inc.
Gowling Lafleur Henderson Llp
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