Calculation method for high-voltage fuses.tv fuse replacement

　　For high current protection zones, the selected fuse should have the following performance: ① large capacity, usually in the tens to hundreds of A; ② Capable of withstanding instantaneous high currents and pulses; ③ High safety and reliability; ④ The operating environment temperature is relatively high; ⑤ Good mechanical characteristics.

　　1. Selection of fuse type

　　Select the appropriate type based on the working environment, size limitations, current characteristics, voltage characteristics, connection method, etc. of the fuse. Usually, high-voltage fuses for electric vehicles use American standard FWH, FWP, and other series.

　　2. Determination of fuse parameters

　　The rated current value of fuses is usually based on the value at an ambient temperature of 23 ± 5 ℃. In order to meet the actual operating requirements of electric vehicles, it is necessary to modify the rated current value.

　　By using the above formula, a preliminary rated current of the fuse can be obtained. However, in general, In is a non-standard value. When selecting a model, choose the standard value greater than In.

　　3. Fuse parameter correction

　　The rated value of the fuse calculated through formula (1) is a preliminary selection data. After the preliminary selection is completed, the rated current value of the fuse is parameter corrected based on actual operating conditions data, such as the duration of overload current, current size, impact current duration, current size, and other factors.

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