Vacuum Interrupters

TD14-12/1250-20BQ     TD14-12/1250-25BQ
TD14-12/1250-20DQ     TD14-12/1250-25DQ
TD14-12/1250-20FQ     TD14-12/1250-25FQ
TD14-12/1250-20HQ     TD14-12/1250-25HQ
Vacuum Interrupters for Circuit Breaker Applications
Rated parameters of vacuum interrupter

№	Parameter item	Unit	Value
1	Rated voltage	kV	12
2	Rated power-frequency withstanding voltage	kV	42
3	Rated lighting impulses withstanding voltage	kV	75
4	Rated frequency	Hz	50
5	Rated current	A	1250
6	Rated peak withstanding current	kA	50	63
7	Rated short-time withstanding current	kA	20	25
8	Rated duration of short-circuit	s	4
9	Rated short-circuit breaking current	kA	20	25
10	Rated short-circuit making current	kA	50	63
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	630
14	Mechanical life	Time	10000

Mechanical parameters of vacuum interrupter:

№	Parameters	Unit	Value
1	Rated contact distance	mm	9±1
2	Contact closing force due to bellows and atmosphere	N	120±50
3	Counterforce of contact	N	180±50
4	Circuit resistance at low limit of rated contact force	μΩ	≤25
5	Contact erosion permission length	mm	﹤3
6	Moving part weight	kg	1.0 ①
Note ① TD14-12/1250-20FQ、TD14 -12/1250-25FQ: 1.3

Mechanical parameters of Vacuum Interrupters for Circuit Breaker Applications:

№	Parameter item	Unit	Value
1	Average breaking speed	m/s	1.0±0.3
2	Average closing speed	m/s	0.55±0.15
3	Rated operation pressure of contact	N	2000±200
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