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Mingde Electrical (Shanghai) Co., Ltd.

Vacuum Circuit Breaker, Switchgear, Earthing Switch manufacturer / supplier in China, offering Vmd 40.5 Kv -1250A Handcart Vacuum Breaker Embedded Pole Types, Pole Mounted 17.5kv-1250A 50Hz Vs1 Vacuum Circuit Breaker, Spout MD/250 with APG Technology and so on.

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Supplier Homepage Company Show Main Products EK6 12/40.5

Main Products

EK6 12/40.5 [Jan 15,2016]
EK6 12/40.5

1. Summary

Earthing switches of series EK6 are determined for indoor in stallation and conform to the requirements of GB1985 and IEC 62271-102. They are fitted with snap-action operating mechanisms for positive high-speed closing and sufficiently dimensioned to conduct the rated short-circuit making current when closed under load. The speed of the snap-action closing operation is independent controls. The earthing switches are supplied as kits with a pre-assem bled active part and correspon ding earthing con tacts supplied loose. Correct in stallation of these parts in a switchgear panel results in a functioning earthing switch. Routine tests toGB1985 and IEC 62271-102 are to be carried out at site accordingly. 

2.  Normal Using Ambient Conditions

(a) ambient air temperature: upper limit  +40ºC;lower limit - 25ºC  
Remark: allow to store and transport under - 30ºC
(b) altitude limit: under 1000m
(c) relative humidity: under 90%
(d) earthquake intensity : not higher than class VIII
(e)the place should be without fire,explode danger, serious dust, chemical corrosion and strong shork.


3. Technical Parameters

 

ModelRated
voltage 
(kV)
Highest
working
voltage 
(kV)
4S rated short
time withstand
curren(kA)
Rated dynamic
stable current
(peak value)
(kA)
Making
current
(peak value)
(kA)
Pole
centers
(mm)
Making
speed
(m/s)
Main circuit
contact
resistence
(μΩ)
EK6-12/31.5-210101231.58080210>6<120
Ek6-40.5/31.5-2803540.531.58080280>6<120

Remark: the pole centers can be changed according to customers' requirement
 

4. Product Model and Meaning

6.Struction and Function
5. Outline Dimension Drawing


         Earthing switches of series EK6 have three pairs of earthing blades which are located on the operating shaft and are freely movable. The pairs of earthing blades are electrically connected to each other by a shortcircuiting bridge and to earth potential at the bearing brackets by two stranded copper conductors. Driver levers and toggle springs located between the bearing brackets are used to transmit the force during the switching process. Fixing the active part on a torsionally rigid switchgear panel wall or cross beam provides it with the necessary stability. 
         The earthing contacts designed to suit the relevant switch type are to be bolted to the conductor bars supported on suitable insulating parts, e.g. pintype insulators, on the opposite side and parallel to each other, and the position adjusted until it conforms to that show in the dimensional drawings. The earthing switch has a snap action closing mechanism which functions independently of the rotation of the drive shaft. The switching speed and torque achieved in this process are independent of the actions of the operating mechanism.
          In the opening process, in contrast, the toggle springs have no effect on the speed of contact separation. A ring lever or suitable manual or motorized operating mechanism with the necessary torque for the type of switch and an operating angle 90° can be fitted for operation of the switch.
          Note: Always open earthing switches by turning until the stop is reached.