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我们在修车时,经常发现解放牌汽车的闪光器被烧坏了。究其原因大多是汽车在长期的行驶过程中,由于电线绝缘不断摩擦破损而造成线路搭铁所致。此时,虽然在线路设计上考虑了闪光器是经过了20安培总保险器,但因为闪光器(电热式)内线圈是用φ0.51mm玻璃丝漆包线绕制的,其截面积只有0.2mm~2左右,负载电流应小于3安培。可是当线路搭铁时,其短路电流大大超过了3安培,未等20安培保险器动作,闪光器线圈却早已烧毁了。也就是说
When we were repairing a car, we often found the flasher of the Jiefang Vehicle burned out. The reason is mostly the car in the long-term driving process, due to the wire insulation friction damage caused by the ground due to the circuit. At this point, although the design of the flash device is considered after the 20 amp total fuse, but because the flash (electric type) coil is φ0.51mm glass enameled wire wound, the cross-sectional area of only 0.2mm ~ 2 The load current should be less than 3 Amps. However, when the circuit is connected to the ground, the short-circuit current greatly exceeds 3 amperes and does not wait for the 20 amp fuse to operate. However, the flash coil has long been destroyed. That is to say