Analysis And Measures For Common Defects Of Drop-out Fuses

Environmental adaptability defects
Temperature and humidity influence
In low-temperature environments, the melting tube may shrink, which can easily lead to seal failure. Statistics from a certain high-altitude region show that in a low temperature environment of -25 ℃, the failure rate of drop out fuse has increased by 70% compared to a normal temperature environment. At the same time, in environments where the relative humidity is consistently above 85%, the corrosion rate of metal components will be accelerated.

Animal infringement
The insulation damage caused by rodent bites accounts for 15% -20% of outdoor failures. Especially the biting of the fixed parts at the bottom of the melting tube may cause abnormal detachment of the melting tube.

5、 Defects in operation and maintenance management
Installation process issues
When the installation angle deviation of the fuse tube exceeds 5 °, the change in the force state of the fuse may cause misoperation. On site measurements show that inclined installation will increase the force on the fuse by 25% -30%, significantly shortening its service life.

Insufficient detection methods
Traditional visual inspection, limited by its own characteristics, can only examine the appearance of objects, while internal defects, hidden dangers, etc. are hidden outside its field of view and difficult to detect. According to the application data of infrared imaging technology, about 38% of potential overheating defects cannot be detected through routine inspections.

6、 Suggestions for response measures
Establish differentiated selection criteria based on operating environment

Promote the application of live detection technology (such as ultraviolet imaging, ultrasonic detection)

Develop a dynamic maintenance cycle and shorten it to 50% of the regular cycle in heavily polluted areas

Develop new composite material melting pipes to enhance their weather resistance and arc extinguishing performance.