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公开(公告)号：US4980645A
公开(公告)日：1990-12-25
申请号：US489800
申请日：1990-03-05
申请人： Kenichiro Soma , Kazuo Kotani , Nobuju Takaoka , Chuki Ikeda , Moritada Marumo
发明人： Kenichiro Soma , Kazuo Kotani , Nobuju Takaoka , Chuki Ikeda , Moritada Marumo
CPC分类号： G01R27/18 , G01R31/021
摘要： A power cable such as a rubber or plastic insulated power cable is diagnosed to be detected an insulation deterioration resulted from water tree generated in an insulation material thereof. At first, charging current flowing from the power cable through a grounding conductor connected to a metal shielding layer thereof to the ground is measured under a state that a rated AC voltage is applied to the power cable. In accordance with the charging current, stray current flowing from the ground to the power cable is calculated. Then, a direct current component of the charging current is detected, and an intrinsic direct current component is calculated by subtracting the stray current from the direct current component. The insulation deterioration is diagnosed in accordance with the level of the intrinsic direct current component.
摘要翻译： 诊断出诸如橡胶或塑料绝缘电力电缆的电力电缆被检测到在其绝缘材料中产生的水树导致的绝缘劣化。 首先，在向电力电缆施加额定交流电压的状态下，测量从电力电缆流过与其金属屏蔽层连接的地线的接地的充电电流。 根据充电电流，计算从地面流向电力电缆的杂散电流。 然后，检测充电电流的直流分量，并通过从直流分量中减去杂散电流来计算本征直流分量。 绝缘劣化根据本征直流分量的水平进行诊断。
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公开(公告)号：US4909960A
公开(公告)日：1990-03-20
申请号：US249532
申请日：1988-09-27
申请人： Kiyoshi Watanabe , Toshio Shiina , Yukio Shimazaki , Hideki Yagyu , Katsutoshi Hanawa , Moritada Marumo
发明人： Kiyoshi Watanabe , Toshio Shiina , Yukio Shimazaki , Hideki Yagyu , Katsutoshi Hanawa , Moritada Marumo
CPC分类号： H01B1/24 , C08K3/04 , C08L23/0853 , C08L23/0869 , C08L2203/202 , C08L2205/03 , C08L23/06 , C08L23/16
摘要： A semiconductive resin composition comprising 100 parts by weight of a polymer component comprising an ethylene-based copolymer, an ethylene-propylene rubber, and a low molecular weight polyethylene having an average molecular weight of 1,000 to 4,000 and 40 parts by weight or more of electroconductive carbon black.
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