Fuse failure analysis and maintenance


1. When the melt melts, carefully analyze the cause of fusing. Possible causes are:

(1) Short circuit fault or overload normal fusing;

(2) The service time of the melt is too long, and the melt is broken by mistake due to oxidation or high temperature during operation;

(3) The melt is mechanically damaged during installation, which reduces its sectional area and causes false fracture during operation.

2. When replacing the melt, it is required to:

(1) Before installing a new melt, find out the cause of melt fusing. If the cause of melt fusing is uncertain, do not replace the melt for test run;

(2) When replacing the new melt, check whether the rated value of the melt matches the protected equipment;

(3) When replacing a new melt, check the internal burn of the fuse tube. If there is serious burn, replace the fuse tube at the same time. When the porcelain melting pipe is damaged, it is not allowed to use other materials to replace it. When replacing the packing fuse, pay attention to the packing.

3. Maintenance work in case of fuse failure is as follows:

(1) Remove the dust and check the contact condition of the contact point;

(2) Check whether the appearance of the fuse (remove the fuse tube) is damaged or deformed, and whether the porcelain parts have discharge flicker marks;

(3) Check whether the fuse and melt are matched with the protected circuit or equipment, and timely investigate if there is any problem;

(4) Check the N line in the TN grounding system and the grounding protection line of the equipment, and do not use fuses;

(5) During the maintenance and inspection of the fuse, the power supply shall be cut off according to the requirements of the safety regulations, and the fuse tube shall not be taken out with electricity.

Post time: Oct-22-2022