DNK Outdoor High Voltage Drop-out Fuse Cut-out Description

 

 

 

SSOC(NCF)1 outdoor AC high voltage falling fuse series are the devices for overcurrent protection.The fuse installed on the distribution transformer or pole of power line serves as device for overload protection and switch on/off the load current.The fuse is composed of a main insulating and conducting structure and an arcing tube.The stationary contacts are fixed at both ends of the fuse tube composed of an arcing tube inside and an phenolic paper tube or epoxy glass tube outside.Equipped with a arcing chamber and elastic auxiliary contacts to interrupt load current and cappacitor current the SSOC(NCF)3 fuse is able to switch on/off the load current.

 

 

 

Principle

 

 

 

In operation the fuse tube with tightened fuse is at position "close".The fuse is melted quickly with fault current when system suffers from failure.Heated by arc the tube gives off gas which blows longitudinally along the tube and increases the pressure inside.As a result,the arc will be distinguished radically.After the fuse is belown out the lower moving contact will turn downward due to the loss of tension to lock the mechanism and release the fuse tube.The fuse tube will fall down to realize a clear breaking.When it is necessary to pull the load,use the insulating rod to draw away the moving contact.At this time,the main moving and static contacts are still in contact.Continue to draw away the moving contact by the insulating rod,the auxiliary contacts will be separated,the electric arc will be produced between the contacts and elongated in the narrow slot of arc chamber.At the same time,the arc chamber will produce gas to extinguish the arc when the current passes zero.

 

 

 

Advantage:

 

 

 

1.Composed of intergral beryllium bronze silver-plated sheets the conducting parts at both ends presents strong mechanical elasticity,no spark while switching off and improves evidently the conducting capacity,contact stability and reliability of the fuse.  

 

2.Made of high conductive copper material and silver-plated on the surface for preventing from oxidation the surface the structure presents reasonable arrangement,large conductive contact area,low resistance.Discharge current capacity more than 1000A. 

 

3.Applying the superior insulating material of electrical porcelain,large creepage-distance and suitable for different environments,the design of structure is optimized for preventing efficiently the insulator from touching of bird.With tower-shaped structure,the fitting is poured and casted by USA white concrete without any swelling can withstand electrodynamic force produced by strong fault current and the impact produced by switching on. 

 

4.With thin sheet copper silver-plated structure,the cap ends of fuse tube will be penetration when heated by arc gives off the gas,presenting the effect of exhausting gradually gas of two-end.  

  

5.Package with the foem inside,carton outside,the suface will be prevented from oxidation for ensuring a long time maintain.