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在对漏电保护器进行模拟触电试验时,人们往往选用适当瓦数的白炽灯泡作试验电阻.试验时,只要灯泡一闪,便说明产生了模拟触电电流,根据漏电保护器的动作情况,从而判断漏电保护器是否可靠.这样做,具有方便、直观的特点,但由于白炽灯泡特性所限,其试验结果并不可靠.为什么呢?白炽灯的灯丝是用金属钨制成的,其熔点很高,通电后,灯丝温度由常温骤升至2000℃以上,达到炽热状态而发光.由于钨的电阻随温度升高而增大,因此,灯泡在发光时,其电阻将随温度升高而骤增,随后稳定
When simulating an electric shock test on a leakage protector, people often choose to use an appropriate wattage incandescent bulb as a test resistance, and when the test is performed, a simulated electric shock current is generated as long as the light bulb is flashing, and according to the operation status of the earth leakage protector, Leakage protector is reliable.This has a convenient, intuitive features, but due to the characteristics of incandescent bulbs, the test results are not reliable.Why? The incandescent filament is made of metal tungsten, the melting point is high , After power, the filament temperature from room temperature suddenly rose to above 2000 ℃, reached the glowing state and light.With the tungsten resistance increases with temperature, therefore, when the light bulb, its resistance will surge with temperature , Then stable