What Issues Need To Be Considered For High-voltage Drop-out Fuses?

What issues need to be considered for drop out fuse?

1. The rated breaking current value of 11 kv drop out fuse should be greater than the larger short-circuit current of the transformer high-voltage system.

2. The rated current of 11kv drop out fuse can allow the transformer to carry periodic overload current under actual use conditions.

3. The time-current characteristics of 11kv drop out fuse manufacturer should adapt to the transformer impulse excitation current.

4. The time-current characteristics of 33kv drop out fuse are within the range of 10 seconds, and the pre-arcing current is small enough to ensure reliable protection of the transformer.

5. The time-current characteristics of 33kv fuse are coordinated with the load switch opening time triggered by cover drop out fuse, so that the breaking function between drop fuse and the load switch can be reasonably switched.

6. The coordination of selective protection can be guaranteed between drop fuse cutout and drop out expulsion fuse.

What are the inspection items for drop out fuse 22kv?

1. Check whether the rated value of drop out fuse 33kv is compatible with the matching of the fuse and the load current.

2. If drop out fuse cut out is used indoors, check whether the porcelain tube seal is intact and whether the contact between the conductive part and the static contact of the fixed base is tight.

3. If drop out fuse element is installed outdoors, check whether the contact of its conductive part is good and tight, whether the fuse itself is damaged, and whether the insulating tube is damaged.

4. Regularly check whether the porcelain insulation part is damaged and has discharge marks.

5. Check whether the installation angle of outdoor drop out fuse in transformer has changed, and whether the opening and closing operation is stuck or flexible.