ZW20-12FOUTDOOR HIGH VOLTAGE VACUUM DEMARCATION CIRCUIIT BREAKER

Short Description:

ZW20-12F outdoor high voltage vacuum demarcation circuit breaker (watchdog switch) is an outdoor power distribution device with a rated voltage of 12kV and a three-phase AC 50Hz.When the user’s internal fault occurs in the T-type wiring of the 12kV distribution line, or although it occurs inside the user’s incoming switch, but its protection action time limit and the substation’s outgoing switch protection are improper, it will cause the substation’s outgoing switch protection to open. If the fault is permanent and the substation recloses unsuccessfully, an accident in the medium voltage user’s field will cause the entire distribution trunk to be out of power. This common spread accident in the power grid will cause significant losses to society. ZW20-12F outdoor high voltage vacuum demarcation circuit breaker (watchdog switch) is installed at the responsibility demarcation of the overhead power distribution line. The front end of the user’s incoming line will automatically remove the single-phase ground fault and inter-phase short-circuit fault within the user to avoid Faults in the user’s world spread to the main transmission line to ensure the safety of electricity use for non-faulty users and improve the reliability of electricity use

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Product Overview

ZW20-12F outdoor high voltage vacuum demarcation circuit breaker (watchdog switch) is an outdoor power distribution device with a rated voltage of 12kV and a three-phase AC 50Hz.

When the user’s internal fault occurs in the T-type wiring of the 12kV distribution line, or although it occurs inside the user’s incoming switch, but its protection action time limit and the substation’s outgoing switch protection are improper, it will cause the substation’s outgoing switch protection to open. If the fault is permanent and the substation recloses unsuccessfully, an accident in the medium voltage user’s field will cause the entire distribution trunk to be out of power. This common spread accident in the power grid will cause significant losses to society.

ZW20-12F outdoor high voltage vacuum demarcation circuit breaker (watchdog switch) is installed at the responsibility demarcation of the overhead power distribution line. The front end of the user’s incoming line will automatically remove the single-phase ground fault and inter-phase short-circuit fault within the user to avoid Faults in the user’s world spread to the main transmission line to ensure the safety of electricity use for non-faulty users and improve the reliability of electricity use

Main Technical Parameters

No.	Item		Unit	Data
1	Rated voltage		kV	12
2	Rated frequency		Hz	50
3	Rated current		A	630	1000
4	Rated short-circuit breaking current		kA	20	25
5	Rated peak withstand current		kA	50	63
6	Rated short-time withstand current		kA	20	25
7	Rated short circuit switching current		kA	50	63
8	Rated operation sequence			open-0.3s-close open-180s-close open
9	Mechanical life		Times	10000
10	Rated current breaking times		Times	10000
11	Rated short-circuiit breaking times		Times	30
12	Frequency withstand voltage 1 min	interphase, to earth	kV	34
		interphase, to earth/Fracture	kV	42/48
13	Lightning impulse withstand voltage	interphase, to earth/Fracture	kV	75/85
14	Secondary circuit 1 min power frequency withstand voltage		V	2000
15	Weight		kg	140
16	Contact opening distance		mm	9
17	Contact contacting stroke		mm	3
18	Average opening speed		m/s	1.2±0.2 ⁺¹-0.5
19	Average closing speed		m/s	0.6±0.2 ⁺¹-0.5
20	rated operation voltage		V	AC/DC220
21	SF6 gas rated pressure (gauge pressure)		MPa	0