SecoGear 24kV-27kV Air Insulation Switchgear
8
Technical specification for Earthing switch -Table 4
S/N
Specification
Unit
Data
1
Rated voltage
kV
24/27
2
Rated Work frequency withstand voltage (1min) in open condition of switch
kV
65
3
Rated Lighting impulse withstand voltage (peak value) in open condition of switch
kVp
125
4
Rated short-time withstand current (3s)
kA
31.5
5
Rated peak value withstand current
kAp
82
6
Rated short circuit making current
kAp
82
7
Centre distance between phases
mm
220/255
8
Electric endurance
Class
E1
9
Mechanical endurance
Times
2000
Resistance to internal arc faults
Arc release
All three primary compartments of SecoGear switchgear are
provided with pressure relief flaps, which will automatically open
and guide the pressurized gas to the rear side direction if an
internal arc fault occurs in an affected compartment
The pressure relief protects damage to switchgear components
and the risk of injury to personnel, which may endanger an
operator or extend the arc fault effect to the entire switchgear
lineup. The relief flap is fixed by 3-M8 steel bolts and the other
side is fixed by plastic M6 screw, The M6 screw will be broken
and flap will open along weakness area( No bend area and part
with oblong holes) when pressure increase quick by internal arc
31.5kA/1s
Keylock (Optional)
The use of key interlocks is to realizing the interlocking logics between units of switchgear, Also the functional truck can be locked in
the racked-out position and the relevant lock key can only be removed with the functional truck in disconnect position. The earthing
switch closing and opening operations can be locked by means of keys. The latter can only be removed with the earthing switch in an
opposed position to the lock to be made.
