|4||1min Power frequency
|5||Lightning impulse withstand voltage||kV||75||125/150|
|6||Rated short circuit breaking current (peak)||kA||80||63|
|7||Rated active load and close circuit breaking current||A||63||50|
|8||Rated transferring current||A||1700||1200|
|9||Rated short circuit making current (peak)||kA||80||63|
|10||Rated cable(line) charging breaking current||A||50 and 10|
|11||Cable charge breaking current in earthing fault||A||20||20|
|12||Rated withstand current (peak)||kA||80||63|
|13||Short time withstand current (2s)||kA||31.5||25|
1-External case 2-Load break switch 3-Mechanism room
Primary loop of FLBS indoor load break switch and its combination is sealed in a epikote casted insulate unit by APG technology,this insulate unit has features of good insulating property, dust and dirts proof, insulate unit contains upper and lower insulatecovers, inside charged 0.4bars pressure SF6 gas, the partial siding of lower cover is very thin, its a protective measure and will burstout in the malfunction, the over pressed gas is released to protect the equipment.
Sf6 load break switch and its fuse combination has open,close and earth three working position.
FLBS load break switch adopts SF6 gas as the medium of arc extinction, when switch on and off, arc occurs and will spin under the and its fuse combination works with spring type operating mechanisms A and K,AFL-12D load break switch equipped with the K spring operating mechanism is applied as the incoming control unit, while that equipped with A mechanism is applied as the outgoing protective unit and transformer unit.
1) “K” Type Spring Operating Mechanism
Working principle of K type spring operating mechanism is spring press and release ( see fig 1. its in off position)
A) Earthing operation
Driven by the handle, upper crank arm 4 rotates and presses spring 2 to store energy, when the max energy reached continue rotatethe crank arm, the energy storage spring starts to release energy and drive the upper trigger, enables the connecting bar to drive thecrank arm, crank armrotates and drives the moving contactor for earthing.
B) 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 armrotates and drives the moving contactor and load break switch turns on.
C) 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.
2) A” Type $pring Mechanism
Working principle of A type mechanism is same as K type, in addition, it has fuse striker unbuckle function. For A type mechanism,electromagnetic unbuckle is also available on customers requirement.(see fig 2)
A) Switch on operation
Driven by the handle, lower crank arm 1 rotates to presse 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 lowerroller wheel unbuckled,and release the switch on spring and load break switch turns on.
B) Switch off operation
Press the switch off button or push the unbuckle pin 2 by the fuse striker, release the spring and load switch turns off.
C) Earthing operation
Earthing operation of A type mechanism ¡s same as that of K type.
3) K type and A type operating mechanism can be operated manually or motorized on request.
***Notice: only when the load break turns off, can turning on and earthing operation be done.
Packing & Delivery
Zhejiang Farady Powertech Co.,Ltd