At present, the RN1 type fuse is commonly used in China to protect the capacitor
bank, and the ideal fuse can make the internal parts of a capacitor short-circuit, and the fuse will be blown in time before the case is blasted to avoid the expansion of the accident. The fusing characteristics of the fuse that protects a single capacitor not only meet the short-circuit capacity requirements of the installation site, but also make the setting current of the fuse match the rated current of the capacitor to be protected, so as to ensure that the fusing can occur before the capacitor case bursts. The following are the technical requirements of the International Electrotechnical Commission for capacitors: (1) With the use of fuses, when the capacitor is broken down, the probability of the capacitor case blasting shall not exceed 10%. (2) The fuse must withstand the safety voltage of the capacitor, the unbalanced voltage caused by the action of the capacitor, and the excessive overvoltage that may be encountered. (3) The fuse should be able to bear 1.43 times the rated current value (ie 1.1X1.3Inu003d1.43In) without melting. (4) The fuse should also be able to bear the inrush current peak value not exceeding 100 times the rated current value (effective value) when closing.
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