Keyword ：

工质 空分装置 跑冷损失 膨胀机 热交换器 上塔 下塔 蓄冷器 液空 液氧

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Keyword ：

氮平均 可逆式换热器 冷凝蒸发器 流程计算 馏份 污氮 下塔 液氮 液化器 液空

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Keyword ：

产冷量 电机制动 活塞式氧压机 空分装置 空透 配套机 全低压 透平膨胀机 氧气透平压缩机 液氧泵

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空分装置 冷凝蒸发器 排氮 膨胀机 启动过程 热端温差 下塔 液氮 液空纯度 主节流阀

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变压器 电抗器 独立自主 工艺方法 焊接电流 弧式 继电器 交流氩弧焊 脉冲输出 脉冲闸流管

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Keyword ：

公斤力 结构强度 连杆盖 球墨铸铁连杆 曲杆 应力测定

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Keyword ：

保冷箱 管道 绝热材料 空分塔 空分装置 珠光砂混凝土 总体设计

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Abstract ：

On the basis of the experimental observation that the conductivity of acetophenone-doped polyethylene is field dependent over a range of applied electric stresses, a simple analysis shows that the increase in resistance to electrical treeing by additives is associated with this field-dependent conducivity. The additives can be considered as weak electrolytes. The rate of their dissociation into positive and negative charge carriers which causes an increase in conductivity is field dependent. A model for the behvior of the additives which leads to the lowering of the electrical stress at sites of high and divergent electrical stresses is given. Presently available experimental results are in agreement with the proposed theory. Other factors affecting this mechanism are discussed.

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