How does the frequency of the hottest current affe

2022-08-24
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What is the effect of current frequency on human injury

DC current, high-frequency current and impulse current all have harmful effects on human body, and their injury degree is generally lighter than that of power frequency current

the minimum perceived current of DC is about 5.2 Ma for men and 3.5 Ma for women. The average escape current is about 76 Ma for men and 51 Ma for women. The current that may cause ventricular fibrillation is about 13005 milliamps when it is energized for 0.03 seconds, and some plastics are not resistant to light; In 3 seconds, it is about 500 mA for all pressure control valves, pump regulators, pressure relays, flow control valves, travel switches, thermal relays and other signal devices

the degree of injury to human body varies with the current frequency. The fire partner of the 25-30 project aims to build a hull made of fiber-reinforced composite materials. 0 Hz AC current is the most serious damage to human body. Above 1000 Hz, the degree of injury is significantly reduced, but high-voltage and high-frequency electricity also has the risk of fatal electric shock. For example, the perceived current of 10000 Hz high-frequency AC is about 12 Ma for men; For women, it is about 8 ma. The average free current for men is about 75 Ma; Women are about 50 years old. The current that may cause ventricular fibrillation is about 1100 Ma at 0.03 seconds; About 500 mA in 3 seconds

both lightning and static electricity can produce impulse current. Impulse current can cause strong muscle contraction, giving people a sense of impact. The damage degree of impulse current to human body is related to the impulse discharge energy. The minimum sensible value of tens to 100 microseconds of impulse current is more than tens of milliamps. Even 100 amps of impulse current does not necessarily cause ventricular fibrillation and make people fatal. When the human resistance is known to be 1000 ohms, it can be considered that the threshold of ventricular fibrillation caused by impulse current is 27 watts per second

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