Vacuum Interrupters

BD-12/630-12.5 Ceramics vacuum interrupter
Rated parameters of vacuum interrupter

№	Parameter item	Unit	Value
1	Rated voltage	kV	12
2	Rated power-frequency withstanding voltage	kV	42 ①
3	Rated lighting impulses withstanding voltage	kV	75 ①
4	Rated frequency	Hz	50
5	Rated current	A	630
6	Rated peak withstanding current	kA	31.5
7	Rated short-time withstanding current	kA	12.5
8	Rated duration of short-circuit	s	4
9	Rated short-circuit breaking current	kA	12.5
10	Rated short-circuit making current	kA	31.5
11	Breaking times of short-circuit current	Time	30
12	Rated operating sequence		O-0.3s-CO-180s-CO
13	Rated single capacitor bank breaking current	A	400
14	Mechanical life	Time	10000
Note:①Value in transformer oil or equivalent insulation equipment

Mechanical parameters of vacuum interrupter:

№	Parameter item	Unit	Value
1	Rated contact gap	mm	9±1
2	Contact closing force due to bellows and atmosphere	N	100±50
3	Counterforce of contact	N	110±50
4	Circuit resistance at low limit of rated contact force	μΩ	≤40
5	Contact erosion permission length	mm	3
6	Moving part weight	kg	0.6

Mechanical parameters of Vacuum Interrupters for Switch Disconnector Applications
Mechanical parameters of vacuum circuit breaker:

№	Parameter item	Unit	Value
1	Average breaking speed	m/s	1.0±0.2
2	Average closing speed	m/s	0.6±0.2
3	Rated operation pressure of contact	N	1100±100
4	Bounce duration of contact closing	ms	≤2
5	Rebound amplitude of breaking contact	mm	Undetermined
6	Out of simultaneity of contact closing and opening	ms	﹤1