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CKVB-12/GD Vacuum Circuit Breaker

CKVB-12/GD type encapsulated medium voltage vacuum circuit breaker (CKVB-G for short) is a kind of product solely researched by Zhuhai Comking Electric Co., Ltd. based on domestic and overseas technology, it is mainly used in the control and protection of power plant, transformer substation and distribution system in 12kV electric power system; especially applicable for frequent operation or multiple breaking and closing circuit current sites under rated working current with excellent performance. This product can be equipped to switchgear like KYN28, XGN2, GG1A etc.

The conductive part of the circuit breaker and the ceramic vacuum arc extinguishing chamber are all cast in the polar column of the epoxy resin.
Using APG technology - epoxy resin casting, it especially prevents electric leakage.
-To avoid dust, moisture, small animal, condensation in arc chamber surface accumulation and
to prevent damp and dirty surroundings in vacuum arc extinguishing chamber from external factors,

to ensure extinguishing arc chamber in the high impedance state fully meet the requirements for use in GB/DL standards for grade II filthy conditions and realize the circuit breaker body maintenance free life, the shell of the vacuum arc extinguishing chamber is made of high strength aluminum oxide ceramic material, and the copper alloy contact is a cup and longitudinal magnetic field structure.
- big breaking capacity, stronger ability of arc
- high levels of insulation, long service life
L cut-off value is less than 5A, the average value is about 3.5A
Compact structure, reasonable layout

It’s operating performance and arc extinguishing chamber opening and closing performance is more consistent, it reduces intermediate transmission link, energy consumption and noise.

- More reliable switching operation

L distance can be smaller
- breaker can be loaded with car type switch cabinet, can also be a fixed type switch cabinet
- To storage, release, maintain the important function of components is used in heart strengthening treatment and surface bite processing.

- Body parts are more resistant to corrosion and abrasion.

- action is more reliable
- operation mode: manual, or electric
- electric operation power: AC / DC 220V, DC 110V
Anti jump, atresia, overcurrent tripping, pressure matching tripping device and secondary circuit optimization design has provided the powerful safeguard for the circuit breaker under reliable and safe operation, but also provides more choices and interface for the user in the protection and intelligent control and other aspects of the design.

The most optional device: two overcurrent trip + 1 or 3 pressure loss tripping overcurrent trip + 1 lock
Good performance, stable operation, long service life, less maintenance
No explosion hazard, no pollution, no noise, more environmentally friendly?


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Description

Unit

Parameter

Rated voltage

kV

12

Short-time withstand voltage

kV

42

Lighting impulse withstand voltage

kV

75

Rated frequency

Hz

50

Rated current

A

630

1250

1600

20002500

31504000

Pole centre distance

mm

150

210

150

210

275

210

275

275

275

Rated short-circuit breaking current

kA

25

31.5

25

31.5

25

31.5

25

31.5

40

40

31.5

40

31.5

40

31.5

40

40

Rated short-circuit making current

kA

63

80

63

80

63

80

63

80

100

100

80

100

80

100

80

100

100

Short-time withstand current(4s)

kA

25

31.5

25

31.5

25

31.5

25

31.5

40

40

31.5

40

31.5

40

31.5

40

40

Rated peak withstand current

kA

63

80

63

80

63

80

63

80

100

100

80

100

80

100

80

100

100

Operating sequence

Opening-0.3s –closing opening-180s –closing opening

Opening time

ms

2050

Arc time

ms

15

Closing time

ms

3070

Average closing speed

m/s

0.50.8

Average opening speed

m/s

0.91.2

Bounce time for contact’s closing

ms

2

Asynchronous time for contact’s closing / opening

ms

2

Allowable accumulated wearing thickness of moving/fixing contact

mm

3

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