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 |
Appearance And Installation Dimensions3