- Feb 02, 2018 -
When the current flows through the conductor, because the conductor has a certain resistance, so the conductor will be hot. and calorific value follows this formula: Q=0.24i2rt, where Q is calorific value, 0.24 is a constant, I is flow through the conductor of the current, R is the conductor's resistance, T is the current flow through the conductor of time; According to this formula we can see the simple working principle of the fuse.
When the material and shape of the fuse are determined, the resistance R is relatively determined (if its resistance temperature coefficient is not considered). As the current flows through it, it heats up and its calorific value increases over time. The size of the current and the resistance determines the speed at which heat is generated, the structure of the fuse and the condition of its installation determine the rate at which the heat is dissipated, and the fuse will not fuse if the heat generated is less than the speed at which the heat is dissipated. If the heat generated is equal to the rate at which heat is dissipated, it will not fuse for quite a long time. If the heat is generated faster than the heat dissipation, then more heat will be generated. And because it has a certain specific heat and quality, the increase in heat is reflected in the rise in temperature, when the temperature rises to the melting point of the fuse when the fuse occurred fuse. This is how the fuse works. We should know from this principle that you must carefully study the physical characteristics of your selected materials when designing and manufacturing a fuse, and make sure that they have a consistent geometric size. Because these factors play a key role in the normal operation of the fuse. Also, when you use it, be sure to install it correctly.
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