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CKVB-12/Z Lateral Vacuum Circuit Breaker

CKVB-12 circuit breaker is a kind of fixed switch equipment installed indoor under three phase AC 50Hz, rated voltage up to 24kV. It is mainly used in the control and protection of power plant, transformer substation and distribution system, it is also applicable for network power supply and distribution, breaking important load and frequent operation site.

controller functions

1.     Three phase arc-extinguish chamber is installed longitudinally and volume is smaller.

2.     Energy-stored drive mechanism is drive by gear, the process of energy-stored is stable, low noise and high efficiency.

3.     It is easy to equip with other switchgear and varies of load break switch in one switchgear. 



 

Working Condition

1Ambient air temperature: -25+40

2Ambient humidity:

----relative average daily humidity: ≤95%

----relative average daily water vapor pressure: ≤2.2kPa

----relative average monthly humidity: ≤90%

----relative average monthly water vapor pressure: ≤1.8kPa

3Altitude: ≤1000m

4 Earthquake intensity: ≤magnitude 8

5 Ambient air doesn’t obviously pollute by dust, smoke, corrosive or combustible gas, vapors or salt spray.

(Exceeding above working condition is available as customized product) 

 

 Standard:

----GB1984-2003

----IEC60056-2001

----GB/T16927-1997

----GB/T 4473-2008

----DL/T403-2000

----JB/T3855-2008

 

Description

Unit

Parameter

Rated voltage

kA

12kV / 24Kv

Rated short-time withstand voltage

phase-to-phase phase-to-earth

kA

65

open contact

kA

79

Rated lighting impulse withstand voltage

phase-to-phase phase-to-earth

kA

125

open contact

kA

145

Rated frequency

Hz

50

Pole centre distance

mm

210mm / 230mm / 250mm / 275mm

Rated current

A

630

1250

Rated short-time withstand current(4s)

kA

25

31.5

25

31.5

Rated peak withstand current

kA

63

80

63

80

Rated short-circuit breaking current

kA

25

31.5

25

31.5

Rated short-circuit making current

kA

63

80

63

80

Rated breaking cable charging current

A

25

Rated capacitor bank inrush making current

kA

12.5

Rated single capacitor bank breaking current

A

630

Rated back to back capacitor bank breaking current

A

400

Operating sequence

/

Opening-0.3s-Closing/Opening-180s-Closing/Opening

Mechanism life

times

20000

Opening times for rated current

Times

20000

Opening times for rated short-circuit current

times

50

Clearance between open contacts

mm

13±1

Overtravel

mm

4±1

Average closing speed

m/s

0.81.2

Average opening speed

m/s

1.11.7

Closing time

ms

3570

Opening time

ms

2050

Bounce time for contact’s closing

ms

2

Asynchronous time for three-phase contacts closing / opening

ms

1

Allowable accumulated wearing thickness of moving/fixing contact

mm

3

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