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VTZ-12
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VTZ-12 Indoor High Voltage Vacuum Circuit Breaker


VTZ-12系列.jpg


1.General  Description

ZN28-12K fixed type indoor MV vacuum breaker (hereinafter :circuit breaker) is a component of 12KV&50HZ indoor switchgear which is accordance with GB1984-2003,JB3855-1996,DL403-2000 and  IEC6227100.

2.Applying  conditions:

Ambient temperature;-20----+40

Relative humidity:daily average ≤95%,monthly average ≤90%

Seismic intensity ≤8

Saturated vapor pressuredaily average ≤2.2kPamonthly average≤1.8kPa

Altitude:≤2000m;(Not including special requirement

Service environmentshould be avoided fire, explosion risk, serious pollution, chemical corrosion and violent vibration

1.Adopt module operating mechanism,integrated stored energy hand shank and reasonable whole structure.

2. Use module design to easy dis-assemble and replace broken parts.

3.Adopt Solid-closure technology in primary circuit to improve insulation and achieve free maintenance.

4.Long life,The circuit breaker meet M2 &E2.

5.Own excellent breaking property to make and break  inductance and capacitance.

6.suitable for KYN-28and XGN-12 and replace VD4-12 and HVX-12.

7.Fixed and handcart assembled unit to meet different requirement of switchgear and circuit breaker.

Equipped with fuse handcart,disconnector handcart and voltage transformer handcart.

3.Overall and assembled dimensions
















2. Assembled dimensions of Circuit breaker &switchgear

 1Assembled dimensions of VTZ Circuit breaker &switchgear(800mm width)

Rated currentA

630

1250

1600

Rated short   circuit breaking currentkA

202531.5

2531.540

31.540

Dimension of   fixed contact Dmm

φ35

φ49

φ55

5.Technical specification

1VTZ Technical specificationTable 1

                                                                          Table 1

No.

Item

Unit

Data

1

Rated voltage

kV

12

2

Rated frequency

Hz

50/60

3

Rated power frequency withstand voltage/1min

kV

42

4

Rated lighting impulse withstand voltage

kV

75

5

Rated current

A

630

1250

1600

2000

2500

3150

4000*

6

Rated short circuit breaking current            Rated short time withstand   current(4s)

kA

20







25

25






31.5

31.5

31.5

31.5

31.5




40

40

40

40

40

40







50

7

Rated short circuit making current(peak)    Rated withstand current(peak)

kA

50







63

63






80

80

80

80

80




100

100

100

100

100

100







125

8

Rated short circuit breaking times

Times

30,50 *

9

Rated duration of short circuit

s

4

10

Rated operating sequence


O-0.3s-CO-180s-CO *

11

Mechanical life

Times

30000

12

Rated single capacitor bank breaking current

A

400

13

Rated back to back capacitor bank breaking current

A

400

Remark:

 1.No.12 &No.13 nominal parameter are offered while user need.

 2.Switchgear should be equipped with forced cooling when rated current is 4000A.

 3.Rated short circuit breaking times are 50 times while Rated short circuit breaking current 31.5KA.

 4.Rated short circuit breaking times are 50 times while Rated short circuit breaking current 31.5KA.

 5.Rated operating sequence is O-180s-CO-180s-CO while Rated short circuit breaking current 40KA

 2Characteristic parameter after VTZ VCB assembly adjusted(table2)

                                                                      Table 2

No.

Item

Unit

Data

1

Clearance between open contacts

mm

9 ± 1

2

Contact travel

3.5 ± 0.5

3

Bounce time of contact closed

ms

≤ 2(1600A and under),≤ 3(2000A and above)

4

Non simultaneity of 3 phase contact opened&closed

≤ 2

5

Distance between phase

mm

210±1.5

275±1.5

6

Rated short circuit breaking current

kA

20~25

31.5

40

50

7

Contact force of contact closed

N

2200±200

3100±200

4500±200

6000±500

8

Average opening speed   

m/s

1.1±0.2(Contact opened~6mm)

9

Average closing speed

0.6±0.2

10

Opening time

ms

20~50

11

Closing time

30~70

12

Wearing for contract permitted

mm

≤3

13

 Resistance for   each main circuit 

μΩ

≤50(630A)≤45(1250~1600A)

≤35(2000A) ≤25(2500 and above)

6.Secondary connection diagram









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