|ZW20B-12 Type Outdoor HV AC Vacuum Circuit Breaker|
SummaryZW20B-12 type outdoor HV AC vacuum circuit breaker is used to make and break load current, overload current and short-circuit current in the power system with rated voltage 12kV, three-phase AC 50/60Hz. It is applicable to substations, industrial and mining enterprises, unban and rural electric power networks, especially to the occasions with frequent operation and automatic power distribution networks for power network control and equipment protection. The product conforms to the standards of IEC62271-100 & GB1984: AC high voltage circuit breaker, IEC60694 & GB/T11022: HV general technical requirement of switch and control apparatus.
Ambient conditions1. Altitude: ≤3000m;
2. Ambient temperature: -30℃～+45℃；diurnal temperature rang ≤25℃;
3. Wind speed: ≤35m/s;
4. Earthquake intensity: ≤grade 8;
5． Relative humidity: monthly average ≤90%; daily average ≤95%;
6． Ice thickness: ≤10mm
7. Pollution degree: ≤Ⅳ(GB5582);
8. Applicable occasions: no fire and explosion danger, no chemical corrosion and no frequent severe vibration.
Main function features1. Three phases in a common fully sealed body, vacuum arc-extinguishing, N2 gas as external insulation;
2. Built-in silicon rubber cover can ensure the standard of 42kV withstand voltage under the natural conditions. Filling in N2 gas, insulation margin is more fully;
3. Simple and convenient for the users to adjust the CT ratio directly by a change-over switch;
4. Hoisting installation or seat installation is convenient for the switch;
5. The automation interface can be provided with the swich as long as it’s equipped with aviation plugs.
6. The switch can realize the function of recloser after equipped with external PT and reclosing controller.
Outline and installation dimension