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    • 73. 发明授权
    • Tree resistant power cable
    • 耐树电力电缆
    • US4457975A
    • 1984-07-03
    • US391348
    • 1982-06-23
    • George Bahder
    • George Bahder
    • H01B7/28H01B13/14B29F3/10
    • H01B13/145H01B13/141H01B7/2813Y10T428/2967
    • 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 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 precursors 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.
    • 公开了一种用于制造耐电化学树的形成和生长的绝缘电缆,特别是聚合绝缘电力电缆的改进的方法和装置。 在挤压过程中,电缆导体侧的内部压力保持低于绝缘体外表面的外部压力。 挤出压力高于外部压力导致挤出后绝缘体的膨胀。 这种膨胀或膨胀减少了电化学树脂前体的裂纹和空隙的数量和尺寸。 此外,将固化介质加压固化在其熔点以上,然后在内部压力和较高的外部冷却流体压力下逐渐梯度冷却至约室温,从而优化电缆对电化学树的成核和生长的阻力。