2. Product reference standard

Shall be in accordance with standards in GB198489 Alternating Current High
Voltage Breaker, JB38551996 3.6~40.5kV Indoor Alternating Current High Voltage Vacuum Breaker, and DL4031999 Specification for Order of 10~35kV Indoor High Voltage Vacuum Breaker, and subject to relative requirements in IEC56 (87 publication). 

3 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. 

4. Main specifications and technical parameters

NO	Item	Unit	Technical Data
1	Rated voltage	KV	12
2	1 min power frequency withstand voltage		42
	Lighting impulse withstand voltage(peak value)		75
3	Rated Frequency	Hz	50
4	Rated current	A	630, 1250, 1600, 2000, 2500, 3150, 4000
5	Rated short time withstand current	KA	20, 25, 31.5, 40
6	Rated withstand current(peak)		50, 63, 80, 100
7	Rated short-circuit opening current		20, 25, 31.5, 420
8	Rated short-circuit closing current		50, 63, 80, 100
9	Rated duration of short-circuit	S	4
10	Contact's clearance		3.5±0.5
11	Contact's travel		9±1/11±1
12	Average opening speed	M/s	1.1±0.2
13	Average closing speed	M/s	0.6±0.2
14	Opening time	Ms	35-60
15	Closing time	Ms	20-45
16	Mechanical life	Times	30000
17	Rated operating order		O-0.3S-CO-180S-CO(<40KA) O-180S-CO-180S-CO(≥40KA)

5 Product structure and operating principle

5.1 Body structure


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. 

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. 

5.2 Operating mechanism(refer to Pic 1, Pic 2)

Operating mechanism is in the form of spring storage energy. It including closing cell, opening cell (composed of one or some trip coil), 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. 

5.2. 1 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. If use motor stored, the sprocket transmission system(14, 23, 18) is driven by Motor outputshaf 15, if use manual operating, the sprocket transmission system(14, 23, 18) is driven by worm(11, 13). 
While the sprocket rotating, pin 2 push the slide4 fixed on wheel 6 move so that let stored energy shaft 7 rotate, so as to execute stored energy through stretching closing spring via crank(5, 21). While reach stored energy position, the limited rod3 press slide 4so as to separate stored energy shaft from sprocket transmission system, stored
Energy retaining stand 9 prop roll wheel 8 for keep stored energy position. 
Meanwhile connection plate 24 fixed on stored energy shaft driving indicator show
"Already stored " and switchover aux switch for cut motor's power supply, after it, 
The breaker is in closing preparation state. 

5.2. 2 Closing 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. 


5.2. 3 Opening operation

This activity can be realize by press "Opening" button, or connect external power
Source to drving opening trip coil or overcurrent trip coil 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. 


5.3 Fool proof interlock

VS1 series vacuum breaker offers complete function for fool proof operation
(Refer to Pic 3 and Pic 4)
1. After closing operating finished, closing interlock bend plate 1 downward moving
To buckle closing bend plate 2, the breaker can not closing again before opening. 
2. After closing finished, If the closing electrical sign not remove in time, inner anti-pumping control circuit will cut off closing circuit for avoid