Summary
ZW20B-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 conditions
1. 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.
Model
Technical specification
No.
|
Item
|
Unit
|
Data
|
1
|
Rated value
|
Rated voltage
|
kV
|
12
|
Rated frequency
|
Hz
|
50/60
|
Rated current
|
A
|
630
|
Rated withstand current(peak)
|
kA
|
50
|
Rated short-time withstand current(4s)
|
20
|
Rated short-circuit making current(peak)
|
50
|
Breaking times of rated current
|
times
|
1000
|
Making times of rated short-circuit breaking current
|
30
|
2
|
1min P.F
withstand voltage
|
Phase to phase, phase to earth
|
kV
|
42
|
Across open contacts
|
49
|
P.F withstand voltage for secondary loop
|
2
|
3
|
Lightning impulse
withstand voltage(peak)
|
Phase to phase, phase to earth
|
75
|
Across open contacts
|
85
|
4
|
Opening speed
|
m/s
|
1.2±0.2
|
5
|
Closing speed
|
0.8±0.2
|
6
|
Closing time
|
ms
|
20~60
|
7
|
Opening time
|
18~45
|
8
|
Contact close-bouncing time
|
ms
|
≤2
|
9
|
Three-phase opening/closing non-simultaneity
|
≤2
|
10
|
Each phase conductive loop resistance
|
μΩ
|
≤120
|
11
|
Rated power for energy storage motor
|
W
|
≯40
|
12
|
Rated voltage for energy storage motor
|
V
|
DC24/DC220
|
13
|
Rated close-operating voltage
|
DC24/DC220
|
14
|
Rated open-operating voltage
|
DC24/DC220
|
15
|
Rated pressure of SF6 gas (gauge pressure)
|
MPa
|
“0”
|
16
|
External creepage distance
|
cm/kV
|
3.8
|
17
|
External charged air insulation distance
|
mm
|
240±2
|
18
|
Phase-to-phase spacing
|
135±1.5
|
19
|
Mechanical life
|
times
|
10000
|
20
|
Net weight
|
kg
|
145
|
|
Main function features
1. 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