12kv Alternator Used Vacuum Circuit Breaker

Product Description

VIB-12F series indoor high voltage alternator vacuum circuit breaker


General Description
VIB-12F series indoor high voltage alternator vacuum circuit breaker(hereinafter referred to as alternator vacuum circuit breaker) is three-phase AC,50(60)Hz indoor power distribution equipment with 12kV rated voltage.VCB applied one-piece design of operating mechanism and vacuum circuit breaker which can be installed in both KYN28A-12 central alternator switchgear and fixed switchgear.Vacuum circuit breaker can control&protect alternator by used in exit of alternator. Alternator vacuum circuit breaker conforms to GB/T14824-2008 of<high voltage alternator vacuum circuit breaker>,and it passed complete type test of standard required system source.

Applying ambient conditions and width of matched switchgear
Ambient temperature:max +40ºC,min -15ºC
The height above sea leval:≤1000m
Relative humidity:daily average relative humidity≤95%,monthly average relative humidity≤90%
Saturated vapour pressure:daily average value≤2.2kPa,monthly average value≤1.8kPa
For special applied conditions,please consult with manufacturer
Width of matched switchgear :1000mm

Main technical  parameters 

No.	Name			Unit	Data
1	rated voltage			kV	12
2	rated frequency			Hz	50/60
3	rated insulation level	1 min power frequency withstand voltage	pole to ground,   between poles	kV	42
			between port		50
		rated lighting impluse withstand voltage	pole to ground,   between poles		75
			between port		85
4	rated current			A	1250	3150	4000
5	rated short circuit breaking current rated thermal stability current(virtual value)			kA	40	40	50
6	rated short circuit closing current(peak value) rated dynamic stability current(peak value)			kA	110	110	137
7	rated short-time withstand current duration			s	2
8	DC component of rated short circuit breaking current			%	75
9	rated out-of-step symmetry breaking current			kA	20(DC%≤20%)
10	rated out-of-step dissymmetric breaking current			kA	20(DC%≤75%)
11	rated out-of-step symmetry breaking current(peak value)			kA	28.3		35.4
12	rated loading current opening time			cycle	50
13	breaking operations of rated short circuit breaking current			cycle	5
14	system resource TRV	expected TRV rising rate		kV/μs	2
		peak voltage		kV	22
		coefficient of first opened phase			1.5
15	rated operating sequence				CO-30min-CO
16	mechanical endurance			cycle	10000

Mechanical Characteristic parameter

No.	Name	Unit	Data
1	contact clearance	mm	11±1
2	contact stroke	mm	3.5±0.5
3	contact bouncing duration closing operation	ms	≤2
4	out of simultaneity of  CO operations of three pole	ms	≤2
5	average opening speed	m/s	1.45±0.25(contact opened 6mm)
6	average closing speed	m/s	1±0.2(4mm before contact closing)
7	opening time	ms	20~50
8	closing time	ms	35~70
9	allowed wear thickness of moved and fixed contact	mm	≤3
10	main circuit resistance of each phase	μΩ	≤35(1250A)≤25(3150,,4000A)

Overall outline drawing 

rated current(A)	1250	1250	4000
rated short circuit breaking current(kA)	40	40	50
matched diameter size of fixed contact	φ79	φ109
matched size of fixed&moving contact is 15~25mm Min,the primary distance between phases is 275mm
recommended matched size of switchgear room is1000mm

                                                                            withdrawable type of 275mm


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