ZW20-12 outdoor AC high voltage demarcation vacuum circuit breaker
is a user demarcation switch. It is mainly composed of three parts:
ZW20-12 vacuum circuit breaker body, fault detection controller and
external voltage transformer.
Technical characteristics
Electrical connection through aviation socket and outdoor sealed
control cable, with fault detection function, protection control
function and communication function reliable judgment, detection of
zero sequence current and interphase short circuit fault current in
and out of the field, and automatic removal of single-phase ground
fault The main body switch of the short circuit fault between
phases and phases is vacuum extinguishing and SF6 gas insulation.
The box body refers to the gas seal of Toshiba, Japan,
explosion-proof, and the insulation structure technology has
excellent overall sealing performance. The SF6 gas filled inside
does not leak and is not affected by the outside world.
Environmental impact, the spring operating mechanism has been
miniaturized and performance optimized design, and the reliability
of the action is significantly improved compared with the
traditional domestic spring mechanism. The contact between the
shaft and the sleeve of the main circuit adopts a retractable
bracelet structure. The contact resistance of the circuit is small,
and the temperature rise is low. Reliable product performance is a
true maintenance-free product.
Normal service condition:
1. Altitude≤2000
2. Ambient temperature: -15℃~+50℃
3. Maximum water vapor pressure:24 hours ≤2.2kpa1 month ≤1.8kpa
4. Wind pressure:≤700pa(34m/s)
5. Earthquake intensity ≤8
6. Ice thickness ≤10mm
7. No fire, explosion danger, chemical corrosion, violent vibration
Technical Parameters
No. | Item | Unit | Parameter |
1 | Rated voltage | KV | 12 |
2 | Rated frequency | Hz | 50 |
3 | Rated current | A | 630 1250 |
4 | Power frequency withstand voltage(DryWet isolation fracture) | KV | 423448 |
5 | Lightning shock withstand voltage | KV | 75 |
6 | Rated short-circuit breaking current | KA | 2025 |
7 | Rated short circuit breaking current breaking times | times | 30 |
8 | Rated operating sequence | | O-0.3s-CO-180s-CO |
9 | Rated short-circuit closing current | KA | 50 63 |
10 | Rated short-time withstand current | 20 25 |
11 | Rated peak value of withstanding current | 50 63 |
12 | Rated short circuit duration | s | 4 |
13 | Mechanical endurance | times | 10000 |
14 | Contact allowable wear thickness | mm | 3 |
