致命电流最小极限值--qsf999的安全生产小屋

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致命电流最小极限值 | 2012-1-13 15:13:00

致命电流最小极限值

在较短时间内危及生命的电流称为致命电流。电台致死原因是比较复杂的。通过人体数十毫安以上的工频交流电流，既可能引起心室颤动或心脏停止跳动，也可能导致呼吸中止。但是，由于心室颤动的出现比呼吸中止早得多，因此，引起心室颤动是主要的。如果通过人体的电流只有20~25mA，一般不能直接引起心室颤动或心脏停止跳动。但如果时间较长，仍可导致心脏停止跳动。这时，心室颤动或心脏停止跳动主要是由呼吸中止导致肌体缺氧引起的。但当通过人体的电流不超过数百毫安的情况下，电击致命的主要原因是电流引起心室颤动造成的。因此，可以认为室颤电流是最小致命电流。
室额电流即通过人体引起心室发生纤维性颤动的电流。室额电流除决定于电流持续时间、电流途径、电流种类等电气参数外，还决定于机体组织、心脏功能等人体生理特征。室额电流与电流持续时间有很大关系。

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Re:在漫画中识别身边的违章 | 2016-10-22 2:42:34

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Re:在漫画中识别身边的违章 | 2016-10-18 19:58:35

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原创 | 2016-9-30 11:16:10

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原创 | 2016-9-28 16:39:29

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