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XNZW32-12 Outdoor Pole-Mounted High Voltage Vacuum Circuit Breaker


XNZW32-12 outdoor pole-mounted high voltage vacuum circuit breaker is a type of 12kV, 50Hz and three-phase switch equipment. It is mainly used for switch on and switch off load current, overload current and short-circuit current in electrical power system. It can protect and control the power distribution system of transformer substations and industrial and mining enterprises, especially rural power network and occasions demanding frequent operations.

This series of circuit breaker is manufactured in conformity with GB1984 “AC High Voltage Circuit Breaker” (applicable state standards of the People's Republic of China) and IEC60056 “High Voltage AC Circuit Breaker” (applicable International Electrotechnical Commission standards). 

Product introduction


Working Conditions:
1. Normal conditions
Ambient temperature: -40℃~+40℃ 
Altitude: not higher than 2000m
Surrounding air can be polluted by dust, smoke, corrosive gas, vapor or salt mist
Wind pressure: not higher than 700Pa (=wind speed 34m/s)
Pollution grade: ≤IV
Working site: no fire, explosion, and chemical corrosion; no frequent severe vibration
Earthquake intensity: not higher than 8°
2. Special conditions:
This series of circuit breaker can also be used in other different conditions, after consistent agreement between client and manufacturer.



Technical parameters:
No.
Items
Units
Values
1
Rated Voltage
kV
12
2
Rated Insulation Level
1min Power Frequency Withstand Voltage
kV
42/48
Lightning Impulse Withstand Voltage
kV
75
3
Rated Frequency
Hz
50
4
Rated Current
A
630          
1250
5
Rated Short Circuit Breaking Current
kA
16    
20
25
6
Rated Short Circuit Making Current (Peak Value)
kA
40
50
63
7
Rated Peak Withstand Current
kA
40
50
63
8
Rated Short Time Withstand Current
kA
16
20
25
9
Rated Short Time Duration
S
4
10
Breaking Times of Rated Short Circuit Breaking Current
Number of Times
30
11
Rated Operation Sequence
 
O-0.3s-CO-180s-CO
12
Mechanical Life
Number of Times
10000
13
Tripping Current of Overload Current
A
5
14
1min Power Frequency Withstand Voltage of Secondary Circuit
kV
2
15
Erosion Thickness Limit of Moving and Fixed Contacts
mm
3
16
Weight
kg
103/138 (with disconnector)


Mechanical parameters:
No.
Item
Unit
Value
1
Contacts Overtravel
mm
2±0.5
2
Clearance Between Open Contacts
mm
9±1
3
Average Closing Speed
m/s
0.6±0.2
4
Average Opening Speed
m/s
1.2±0.2
5
Contact Bouncing Time While Closing
ms
≤2
6
Three Phases Non-Simultaneity While Closing
ms
≤2
7
Three Phases Non-Simultaneity While Opening
ms
≤2
8
Opening Time
ms
25-60
9
Closing Time
ms
20-65
10
Major Loop Resistance of Each Phase
Without Disconnector
μΩ
<80
With Disconnector
μΩ
<130
11
Center Distance of Phases
mm
340±2


Technical parameters of Spring Operating Mechanism: 
No.
Items
Rated Voltage (V)
Rated Current (A)
Normal Working Range
1
Opening Coils
DC24
7
DC65% or AC85%-120% rated voltage allows tripping, below 30% rated voltage allows no tripping
DC110
5
DC220
1.8
AC220
3.5
2
Closing Coils
DC24
7
DC80% or AC85%-120% rated voltage allows tripping
DC110
5
DC220
1.8
AC220
3.5
3
Tripping Coil of Overload Current
5
90% rated current allows no tripping, 110% rated current allows tripping
4
Energy Storage Motor
Rated Voltage: DC/AC220V
Rated Power: 40W
85%-120% rated voltage allows operating
5
Energy Storage Time of Closing Spring
<10s


Technical parameters of disconnector:
No. Items Units Values
1 Rated Voltage kV 12
2 Rated Insulation Level 1min Power Frequency Withstand Voltage kV 42
Lightning Impulse Withstand Voltage kV 75
3 4s Rated Short Time Withstand Current A 20
4 Manual Operation Torque Nm ≤200
5 Contact Knife Instant Touch Position Offset mm 2
6 Clearance Between Disconnector Ports Mm ≥200
7 Current-Carrying Part’s Insulation Distance to Ground mm ≥200

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