Vacuum Interrupters

TD-18/-120AQ   Vacuum interrupter
Specifications of Vacuum Interrupter

№	Parameter item	Unit	Value
1	Rated voltage	kV	18
2	Rated frequency	Hz	50
3	Rated lighting impulses withstanding voltage (fracture)	kV	115
4	Rated short-time power-frequency withstanding voltage (fracture)	kV	63
5	Rated current	A
6	Rated short-time withstanding current	kA	120
7	Rated peak withstanding current	kA	329
8	Rated short-circuit breaking current	kA	120
9	Rated short-circuit making current	kA	329
10	Rated duration of short-circuit	s	4
11	Rated operating sequence
12	Breaking times of short-circuit current	Time	2
13	Rated out-of-synchronism symmetric breaking current	kA	120×(50％)
14	Percentage of DC component in rated short-circuit breaking current	%	76
15	Shelf life	a	20
16	Arcing time	ms	≤30
17	Mechanical life	Time	10000

Mechanical parameters of vacuum interrupter:

№	Parameter item	Unit	Value
1	Rated contact gap	mm	13±1
2	Contact closing force due to bellows and atmosphere	N	650±100
3	Counterforce of contact	N	700±100
4	Circuit resistance at low limit of rated contact force	μΩ	≤8
5	Contact erosion permission length	mm	3
6	Moving part weight	kg	12

Mechanical parameters of Vacuum Interrupters for Circuit Breaker Applications

№	Parameter item	Unit	Value
1	Average breaking speed	m/s	1.8±0.1
2	Average closing speed	m/s
3	Rated operation pressure of contact	N	43000±1000
4	Bounce duration of contact closing	ms	≤2
5	Rebound amplitude of breaking contact	mm	≤1.5
6	Out of simultaneity of contact closing and opening	ms	＜1