Operation precautions and operation and maintenance of polymer type fuse cutout

The protective property of polymer-type fuse cutout is also called melting property. When the current exceeds the specified value, it uses the heat generated by itself to fuse the melt and break the circuit. The function of polymer type fuse cutout in the circuit is over-current protection, which can also be called short-circuit protection. Next, let's take a look at the operation precautions and operation and maintenance of polymer-type fuse cutout. Here are some answers.

Here is the content list:

•  Precautions for the operation of polymer-type fuse cutout.

•  Operation and maintenance of polymer-type fuse cutout.

Precautions for the operation of polymer-type fuse cutout.

The polymer-type fuse cutout is operated by two persons (one person for supervision and one person for operation) but must wear insulated gloves that have passed the test, wear insulated boots, goggles, and use qualified insulated rods that match the voltage level. It is forbidden to operate polymer-type fuse cutout under thunder and lightning or heavy rain. In addition, in the opening operation, it is generally stipulated that the middle phase is pulled off first, then the leeward side phase, and finally the windward side phase is pulled off. When closing, the sequence of operations is reversed when opening the gate, first close the windward side phase, then close the leeward side phase, and finally close the middle phase. It is especially worth noting that moderate force should be used when pulling and joining the fusion tube.

Operation and maintenance of polymer-type fuse cutout.

To make the polymer type fuse cutout run more reliably and safely, in addition to strictly selecting qualified products and accessories (including fuses, etc.) produced by regular manufacturers by the requirements of the regulations, special attention should be paid to the following matters in the operation and maintenance management: Whether the rated current of the polymer type fuse cutout matches the melt and load current values properly, and it must be adjusted if it is not properly matched. Second, each operation of the polymer type fuse cutout must be done carefully and not carelessly. Especially for the closing operation, the moving and static contacts must be in good contact. Third, the standard melt must be used in the fuse tube. It is forbidden to use copper wire and aluminum wire to replace the melt, not to mention the use of copper wire, aluminum wire, and iron wire to tie the contacts. Fourth, the newly installed or replaced polymer type fuse cutout must be strictly checked and accepted, and the quality requirements of the regulations must be met, and the installation angle of the melt pipe must reach an inclination angle of about 25°. Fifth, the polymer-type fuse cutout should be patrolled regularly, and no less than once a month at night to check for discharge sparks and poor contact. If the polymer-type fuse cutout is discharged and accompanied by a hissing sound, arrange for treatment as soon as possible.

During the spring inspection, the polymer type fuse cutout should be checked as follows: First, whether the static and moving contacts are in good contact with each other, whether they are in good condition, and whether there are burn marks. Second, whether the rotating parts of the polymer type fuse cutout are flexible, rusty, or not rotating properly, whether the parts are damaged, and whether the spring is rusted. Thirdly, whether the melt itself has been damaged, whether it has become slack and weak due to excessive heat and elongation after long-term power-on. Fourth, check whether the upper and lower connecting leads of the polymer type fuse cutout are loose, discharged, or overheated.

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