Description:
Generally, CUT OUT FUSE contains following parts:
1- Insulator
2- Metal parts
3- Tube
4- Fuse link
This type of fuse is used for protecting of aerial trances; and its cut out element is called "Fuse Link". Cicuit Cutting Processes by CUT OUT FUSE is as follow:
In case of any deficiency or problem in main lines, a short connection happens. This short connection flows in the main lines. As soon as the current passes, the voltage of the main line drops rapidly and reaches to zero. The energy created by current passage of short connection melts the fuse element. At melting status, the temperature of element increases the resistance of fuse (element); and current passage decreases the pressure of both tips of fuse. When the element is cut, the spark ARC current passes through the fuse and the current resistance increases quickly; so the pressure increases at both tip of fuse. The extra pressure, which can not be provided by main line, would be provided by circuit inductivity of trans (e= 1 di/dt); and finallythis inductivity causes the current to drop zero. It should be mentioned that these processes happen in a few milli-seconds and disconnection of fuses will occur in a few milli-seconds. For example, when 9 Amp current passes through a 25 Amp fuse, this current will be cut in 2.7 seconds.
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