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When will the high-voltage fuse blow?



When will the high-voltage fuse blow? It will be very helpful for us to install and use the high-voltage fuse in the future.

High-voltage fuses generally blow in the following situations:

1. The high-voltage fuse has a small size, improper installation, and insufficient mechanical strength, which will lead to fusing. Generally, only one phase is broken. In most cases, there are no obvious arc traces. Replacing the high-voltage fuse can restore power transmission.

2. The fuse of the high-voltage fuse is blown due to an internal fault in the transformer, and most of the two-phase fuses are blown. In this case, the reason should be found out before power transmission can be resumed. When the internal fault of the transformer often causes oil injection from the joints of the large cover of the fuel tank, the oil filling hole, etc., open the oil filling hole cover and smell the oil fume. According to the oil fume, judge whether the transformer has been burned and whether it can continue. use. If there is no obvious symptom, the reason should be found out before putting into operation.

3. The high voltage fuse is blown due to remote short circuit or overload. Due to the long fuse blowing time and the combination of high and low voltage fuses, the high and low voltage fuses can be blown at the same time. In this case, arc traces and the melting point of the fuse are left on the fuse tube and the porcelain holder. When processing, use a shaker to measure the insulation resistance of the transformer between high and low voltage to the ground and between them, and use an ohmmeter to measure the conduction of the high and low voltage windings and the balance of DC resistance. If there is no abnormality, disconnect all fuses on the low-voltage side, replace the high-voltage fuses for power transmission, listen to whether the sound of the transformer is normal, and measure whether the secondary voltage is balanced. If there is no problem, resume power transmission to the low voltage.