12kv SF6 load break switch
Model No.: FLN36-12
FLN36-12kV SF6 load break switch is a switch equipment for medium voltage switchgear, using SF6 gas as arc extinguishing and insulating medium.There are three working positions:open, closed, earth position in the switch. The compact size, easy installation, and fine adaptability to environment make the switch suitable for many different applications.
It can be divided into two types: FLN36-12D ( K type single spring operating mechanism ),FLRN 36-12D (A type double spring operating mechanism). The latter type could be equipped with fuse combination, having control and protecting function, which can be used for power supply and substation as a protecting and control device, especially suitable for ring main unit, cable distribution box and switching substation.
Manual operating mechanism
K type spring dual-function operating mechanism: as a inlet control unit, the working principle of K type spring operating mechanism is spring press and release.
Earthing operation: driven by the handle, upper crank arm rotates and presses spring 2 to store energy, when the max energy reaches continue rotate the rank arm, the energy storage spring starts to release energy and drive the upper trigger, enables the connecting bar to drive the crank arm, crank arm rotates and drives the moving contactor for earthing.
Switch on operation: driven by the handle, lower crank arm 1 rotates, presses spring 2 to store energy, when the energy released, it drives the trigger 8, enables connecting bar to drive the crank arm, crank arm rotates and drives the moving contactor and load break switch turns on.
Switch off operation: rotate the main shaft crank arm counterclockwise by the handle, release the energy storage spring and the load break switch turns off.
A type spring dual-function operating mechanism: as a outlet control unit.
Working principle of A type mechanism is same as K type, in addition, it has fuse striker trip function. For A type mechanism. Electromagnetic trip is also available for customers requirement.
Switch on operation: driven by the handle, lower crank arm 1 rotates to press switch on spring 12 and switch off spring 8 at the same time, to provide sufficient energy required by switching off. When the lower crank arm 1 buckles the pin and drives trigger to move, it makes the lower roller wheel tripped, and release the switch on spring and load break switch turns on.
Switch off operation: press the switch off button or push the trip pin 2 by the fuse striker, release the spring and load switch turns off.
Earth operation: earthing operation of A type mechanism is the same as that of K type.
Motorized operating mechanism
Motor operation can be added to both types of operating mechanisms, which means it can be operated manually or motorized.
Operating voltage: DC48V AC/DC 110V 220V
Technical Parameter of FLN36-12
1.Ambient temperature:-40℃ ~+40℃
2.Relative humidity：Daily average ≤ 95%
Monthly average ≤ 90%
3.Altitude: ≤ 2000m
4.Earthquake intensity：≤ 8 degree
5.No corrosive gas,no combustible gas,no steam and shake.
*Annual leakage rate ≤ 0.1%
*Special conditions：When the altitude ＞ 2000m,please indicate in order to adjust the designing scheme.
MAIN TECHNICAL SPECIFICATION UNIT FLN36-12D/T630-20 Load break switch FLRN36-12D/125-50LBS + Fuse-combination units Rated voltage kV 12 12 Rated frequency Hz 50 50 Rated current A 630 125 Short-duration（1min） power frequency withstand voltage kV 42 42 Lightning impulse withstand voltage kV 75 75 Rated power frequency withstand voltage（5min） kV 24 24 Rated short-time withstand current(Load break switch/3s) kA 20 20 Rated short-time withstand current(Earthing switch/2s) kA 20 20 Rated peak withstand current(Load break switch) kA 50 50 Rated peak withstand current(Earthing switch) kA 50 50 Rated short-circuit making current(Load break switch) kA 50 125 Rated short-circuit making current(Earthing switch) kA 50 50 Rated closed-loop dropout current A 630 Rated active load breaking current A 630 Rated cable-charging breaking current A 10 10 Rated short-circuit breaking current kA 50* Rated transfer current A 1750* Fuse type XRNT-12kV/125A* Fuse impact output energy J 1±0.5 Mechanical endurance LBS/Earthing switch Time 5000/2000 5000 Air insulation distance of charged body and ground mm ≥ 125 ≥ 125 SF6 Gas pressure(Relative pressure at 20℃ ) bar 0.4 0.4 Opening and Closing simultaneity ms ≤ 2 ≤ 2 Main circuit resistance μΩ ≤ 65 ≤ 65
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