What is a drop out fuse cutout?
Drop-out fuses and load-drop fuses are outdoor high-voltage protection devices installed on the high-voltage side of distribution transformers or distribution line branches. They are used for short circuits, overload protection, load current breaking, etc. Transformers and circuits.
The drop-out fuse consists of an insulating base, a static contact, a moving contact, and a fuse tube. The static contacts are installed at both ends of the insulating bracket, and the moving contacts are installed at both ends of the fuse tube. The fuse tube is composed of an inner arc extinguishing tube and an outer phenolic paper tube or epoxy glass cloth tube. The load-dropping fuse is equipped with a spring auxiliary contact and an arc extinguishing cover to realize load switching.
How does a differential pressure drop out fuse cutout work?
When a drop-out fuse operates normally, the tension in the fuse creates the closed position of the fuse tube. When a system fault occurs, the fault current will quickly melt the fuse and form an arc. The arc extinguishing tube is heated by the arc, releasing a large amount of gas, generating high pressure in the tube, and forming a longitudinal spray along the tube. The arc quickly lengthens and extinguishes. After the fuse melts, the downward-moving contacts lose tension and flip downward, releasing the fuse tube from the lock, and allowing it
Selling points of drop out fuse cutout
1、High mechanical intensity
High mechanical intensity, reliable structure,
provides a guarantee for the safe operation of the line.
2、Good pollution resistance performance
Strong anti-pollution ability, wide range of application
it does not require annual cleaning and maintenance in
polluted Areas.
3、Acid and alkalis resistance
Heat-proof aging and electricity resistance;
Seal well to ensure internal insulation without damping.
4、Good brittle resistance
Strong earthquake resistance, Avoid fracture accidents
5、Easy to install
Large diameter ring pull design. Installation and operation more Convenient
Technical information of drop out fuse cutout
NDRW12 series drop out fuse cutout 10-15KV
Rated voltage: 10-15KV
Rated current: 100A, 200A
Breaking current: 8/10 kA
Power frequency withstand voltage (kV): 40kV
Size (cm): 42 x 37 x 13.5
NDRW12 series drop out fuse cutout 15-24KV
Rated voltage: 15-24KV
Rated current: 100A, 200A
Breaking current: 10/12 kA
Power frequency withstand voltage (kV): 45kV
Size (cm): 52 x 37 x 13.5
NDRW12 series drop out fuse cutout 24-27KV
Rated voltage: 24-27KV
Rated current: 100A, 200A
Breaking current: 10/12 kA
Power frequency withstand voltage (kV): 45kV
Size (cm): 52 x 38 x 17
NDRW12 series drop out fuse cutout 33-36KV
Rated voltage: 33-36KV
Rated current: 100A, 200A
Breaking current: 10/12 kA
Power frequency withstand voltage (kV): 45kV
Size (cm): 62 x 38 x 17
The application of drop out fuse cutout
1、Protection of Transformers
Transformers are vital for adjusting voltage levels between high-voltage transmission lines and lower-voltage distribution lines. drop-out fuse cutout protect these transformers from currents exceeding their capacity, which can cause overheating and failure.
2、Line Protection
drop-out fuse cutouts safeguard distribution lines from overcurrents caused by faults like line-to-ground contacts or short circuits, ensuring a stable and reliable power supply.
3、Equipment Safety
Beyond transformers and lines, drop-out fuse cutouts are integral to protecting a variety of electrical equipment from overcurrent damage, thus ensuring longevity and reducing maintenance costs.
Precautions for drop out fuse cutout
1、Proper Sizing and Selection: Ensure correct sizing to match the system’s operating current and specific equipment protection needs.
2、Regular Inspections: Periodic checks for wear, damage, or contamination to maintain system integrity.
3、Safe Handling Practices: Only qualified personnel should handle high voltage fuses, using proper safety equipment and procedures.
4、Environmental Considerations: Installations should account for local conditions like temperature extremes and moisture to ensure reliable operation.
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