product overview
zjw series dc earthing switch can be installed in the dc bus of extra high voltage converter station and high voltage side and neutral point of filter. it is mainly used in reliable earthing of high voltage busbar under maintenance, converter valve, smoothing electric reactor and other electrical apparatus and provide a satisfactory and safe working environment for equipment under maintenance and maintainers.
the dc earthing switch adopts folded plug-in type and its folded process adopts structure of gear and rack. after closing, support rod is located in middle gear. during motor process, balance of gravitational potential energy adopts the method of combined balancing weight and balance spring, whose operation is light and flexible. the earthing fixed contact finger adopts rose-type structure, which benefits to performance improvement of power and dynamic stability.
structure and characteristics
1. adopts single arm folded structure and can effectively reduce floor space
2. fixed contact can directly hang on pole busbar, teh structure is simple and product performance is stable
3. the folded process adopts gear and rack structure, so its operation is reliable and stable.
4. in closing position, support bar and rod of earthing switch form triangle form, improving rigidity and stability of product.
main technical parameters
|
item |
unit |
parameters |
|
type |
|
zjw2-1120 |
|
rated dc voltage |
kv |
1120 |
|
60min dc withstand voltage |
kv |
1600 |
|
rated lightning withstand voltage（peak value 1.2/50ms） |
kv |
2700 |
|
rated switching impulse voltage（peak value 250/2500ms） |
ka |
2100 |
|
rated short-time withstand current（3s） |
ka |
25 |
|
rated peak withstand current |
ka |
63 |