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VTZG-24M
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VTZG-24M Indoor High Voltage Vacuum Circuit Breaker


VTZ-12PM.jpg

1.General  Description

 VTZG-24M series of indoor HV vacuum circuit breaker is with rated voltage of 24kV.three-phase AC 50 (60) Hz indoor HV switch equipment.The structure of this kind of circuit breaker is simple but with strong breaking capability:it is suitable

for application in the mining industry,substations and power transmission and distribution systems for controlling and protecting the switch. Especially suitable for the industry which requires frequently operations like metallurgy fietds,electric

arc steel plant to control and protect the equipment.This kind of vacuum circuit breaker can be assembled with truck which can be suitable for many kinds of switchgears  such as JYNI.GBC etc

2.Applying  conditions:

Ambient temperature;-10----+40

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

Seismic intensity ≤8

Saturated vapor pressuredaily average ≤2.2kPamonthly average≤1.8kPa

Altitude:≤1000m;(Not including special requirement

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

3. Structural characteristics:

1.The operating mechanism is introduced the technique of operating mechanism from Siemens VTZ vacuum circuit breaker. the operating mechanism is integrated with vacuum circuit breaker,with characteristics of short transmission routes,less chains and high transmission efficiency.

2.This operating mechanism adopts spring type.It can be operated by AC or DC.also can be operated by manual.

4. Technical specification

No.

Item

Unit

Data

1

Rated voltage

kV

24

2

Rated frequency

Hz

50/60

3

Rated power frequency withstand voltage/1min

kV

65

4

Rated lighting impulse withstand voltage

kV

125

5

Rated current

A

630

1250

1600

2000

6

Rated short circuit breaking current

kA

25

25



Rated short time withstand current(4s)


31.5

31.5

31.5

7

Rated short circuit making current(peak)

Rated withstand current(peak)

kA

63

63




80

80

80

8

Mechanical life

Times

10000

9

Rated duration of short circuit

s

4

10

Rated operating sequence


O-0.3s-CO-180s-CO

11

Rated short circuit breaking times

Times

20

12*

Rated single capacitor bank breaking current

A

400

13*

Rated back to back capacitor bank breaking current

A

400

14

Supply voltage of opening&closing circuit

V

AC/DC  220/110

15

Rated current of closing coil

A

DC220(0.89);DC110(1.91)

16

Rated current of opening coil

A

DC220(1.25);DC110(1.91)

17

Clearance between open contacts

mm

13 ± 1

18

Over-travel of contact

mm

3.5 ± 0.5

19

Opening &closing simultaneity of 3 phase contact

ms

≤ 2

20

Bounce time of contact closed

ms

≤ 3

21

Closing time

ms

≤ 100

22

Opening time

ms

≤ 50

23

Average closing speed

ms

0.75 ~1.25

24

Average opening speed   

m/s

1.15~1.85

25

Max DC component


40%





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