Vf2 12kv Type Embedded Pole Indoor Vacuum Circuit Breaker

1 Overview
VF2-12 TYPE vacuum Circuit breaker , indoor high voltage switchgear suitable for 11/12kV. Threephase power system with 50Hz/60hz frequency in order to protect and control electrical appliances, and especially suitable for frequent operation at rated current or incessant open circuit due to unique advantages of vacuum circuit breaker. 
Spring operating mechanism and breaker body parts adopt integration design. Thank for this design, breaker not only can be a fixed installation unit, but also can be a withdrawable unit with a specially pushing framework. For meet the requirement of XGN2, GG1A cabinet, the fixed type breaker can be install additionally interlock. 












2 Operating environment condition

A) Normal operating environment condition
Highest temperature: +40ºC
Lowest temperature: -15ºC
B) Environment humidity
Daily mean relative humidity: ≤95%
Monthly mean relative humidity: ≤90%
Daily mean saturated vapor pressure: ≤2.2×10-3 MPa
Monthly mean saturated vapor pressure: ≤1.8×10-3 MPa
C) Altitude: Below 1000m area; 
D) Earthquake intensity: No more than 8 degree; 
E) The product shall be away from weep, fire and explosion, chemical corrosion and strenuous vibration place. 

3. Main specifications and technical parameters
 
4 Product structure

4.1Body structure

The VF2-12 Type VCB with Embedded poles for better interrupter function.


Spring operating mechanism and main parts adopt integration desigh, primary
Conductive circuit install in tube located in the rear of breaker and the mechanism is
In the front of breaker, which the tube is apopt epoxy resin as material and used
Advanced APG technology for forming. Thank to this material, vacuum interrupter
Can avoid harmful effect from external factor. 
Primary conductive circuit current route of breaker at closing position as follow: (refer to Pic 2): Current flows from upper outlet holder 27 through upper support 26
Fixed on the upper part of arc extinguish chamber to fixed contact in the vacuum
Interrupter, then through moving contact and conductor clasp, flexible joint to
Lower support 30, to lower outlet holder 31 into a complete conductance circuit. 


The VF2-12 Type VCB with Embedded poles for better interrupter function.


While being delivered from the factory, Proofdust insulating tube cover is install on all current level 's breaker. While start to use, it is not necessary to remove while the current is equal to 1250A or less than 1250A, but it must be remove, if the current up to 1600A or pass 1600A. 

4.2 Operating mechanism
Operating mechanism is in the form of spring storage energy. It including closing cell, opening cell (composed of trip solenoid which also under our production PLS search: "OPEN-CLOSE SOLENOID" in my web ), aux switch, indicator device and
So on. In the front of it, there are closing/opening button, manual storage energy operatin hole, indicator of storage-energy situation, indicator of closing/opening
And so on. 

4.3 Stored energy operation

While start to closing, the need power is come from closing spring's stored-energy activity. This activity not only can be finished by motor, but also can be used manual operating by handle Stored energy operation: Used motor 16 for Stored or manual operating by anticlockwise wing handle.

"Already stored " and switchover aux switch for cut motor's Power Supply, after it, 
The breaker is in closing preparation state. 

4.4Closing operation

While clsoing operaitng, the closing coil can be move by press "closing"button or remote manipulation, this activity can driving stored energy retaining shaft 19 rotate, 
And as so to retaining stand 9 release roll wheel 8. Closing spring shrink and through
Crank (5, 21) driving stored energy shaft 7 and cam 22 fixed on shaft rotate, cam's
Rotate movement driving connection rod mechanism(34, 36, 37, 38, 39) to drive
Insulating pull rod 33 and move contact entry into closing position, and compress disc spring 32, for keep the contact pressure of contact wanted. After closing activity finished, closing retaining stand 38 and semiaxis keep in closing position, meanwhile store energy indicator and stored energy aux switch recovery motor's supply circuit connecting. It will be entry storedenergy state again, if external power source connecting, and connection plate 44 driving closing/opening indicator and show "Closing", main aux switch switchover by transmission connection rod pulling. 

4.5 Opening operation

This activity can be realize by press "Opening" button, or connect external power
Source to drving opening trip coil or overcurrent trip solenoid (which also under our production PLS search: "OPEN-CLOSE SOLENOID" in my web ) as so to unlock closing
Retaining stand 38 from semiaxis 41 for reach to opening. The contact spring and
Energy of opening spring 35 driving vacuum interrupter 28 's fixed and move contact separate. In the rear stage of openning process, the hydrolic will absorb the leaving energy and limit the separate position. Connection plate 44 driving closing/opening indicator and show"Opening", meanwhile counter implements counting, main aux switch Switchover by transmission connection rod pulling. 



VF2-12 series vacuum breaker offers complete function for Over-current Protection.

PLS contact me for further information of VF2-12

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