ZW32-12 Outdoor Medium Voltage Vacuum Circuit Breaker
ZW32-12 Outdoor Medium VoltageVacuum Circuit Breaker
The ZW32-12 outdoor medium voltage vacuum circuitbreaker has a rated voltage of 12 KV. It is a kind of three phase outdoordistribution facility for 50 Hz Power.
The featuresinclude great stability and reliability, small size, light weight and longservice life. Besides it won’t burst into fire or blast. This breaker is mainlyused for the powerdistribution network, and the load current, overload current andshort-circuit current in the electric system. It is also suitable forprotecting and controlling the power distribution system in substations,industrial and mining companies, villages, as well as places where frequentoperations are needed. Typically, our product meets the requirements for upgradingpower grid in cities and rural places.
The ZW32-12 outdoor medium voltage vacuum circuit breaker comes with twokinds of operating mechanisms, namely spring type operating mechanism and permanentmagnetic operating mechanism.
Model name and its meaning
：：
ZW 32-12/T□630(1250)-20 G
Disconnector
（kA）Rated short-circuit breaking current (kA)
（A）Rated current (A)
（D-，S-）Mechanismtype (D-Motor driven, S-Manual)
Operating mechanism of energystoring spring
（kA）Maximum working voltage (kA)
Designing series number
Outdoor vacuum circuit breaker
Working environment
1. Altitude: ≤ 3000 m
2.Ambient temperature: -45℃～ 45℃
3. Wind speed: ≤ 35 m/s
4. Pollution class: Class IV(according to GB/T5582-1993)
5. Installation area: No flammable,explosive or chemically corrosive substances
| Table-1 Main technical parameters of circuit breaker | |||
| NO. | Item | Unit | Data |
| 1 | Rated voltage | kV | 12 |
| 2 | Rated frequency | Hz | 50 |
| 3 | Rated current | A | 630,1250 |
| 4 | Rated short-circuit breaking current | kA | 20 |
| 5 | Rated peak withstand current | kA | 50 |
| 6 | Rated short-time withstand current/duration | kA/S | 20/4 |
| 7 | Rated peak short-circuit making current | kA | 50 |
| 8 | Rated operating sequence |
| Opening-0.3s-closing and opening-180s-closing and opening |
| 9 | Mechanism endurance | Time | 10000 |
| 10 | Rated current breaking times | Time | 10000 |
| 11 | Rated short-circuit breaking current breaking times | Time | 30 |
| 12 | Power frequency withstand voltage (1 min, dry / wet, phase to phase / phase to earth and across open contacts) | kV | 34 42/49 |
| 13 | Lightning impulse peak withstand voltage (phase to phase / phase to earth and across open contacts) | kV | 75/85 |
| 14 | Secondary circuit power frequency withstand voltage (1 min) | V | 2000 |
| Table-2 Main technical parameters of operating mechanism | ||||
| NO. | Item | Rated voltage (V) | Rated current (A) | Working condition |
| 1 | Opening coil | DC24 | 7 | Reliable tripping: 65%-120% rated voltage |
| DC110 | 5 | |||
| DC220 | 3.5 | |||
| AC220 | 1.8 | |||
| 2 | Closing coil | DC24 | 7 | Reliable tripping: 65%-120% rated voltage |
| DC110 | 5 | |||
| AC220 | 3.5 | |||
| DC220 | 1.8 | |||
| 3 | Over current trip coil | 5 |
| |
| 4 | Energy storage motor | Rated voltage: DC/AC220V | Reliable tripping：85%-110% rated voltage | |
| 5 | Closed spring energy storing duration | Less than 10S |
| |
The graph of the circuit breaker's dimension and installation
：：
（The side view of the breakerwith insulated switch）
1、 Vacuum arc quenching room
2、 Upper insulating cover
3、 Lower insulating cover
4、 Insulating pull rod
5、 box
6、Operating mechanism
7、 Drive rod
8、、 Breaking & makingindicating board
9、Mutual inductor
10、Insulated switch
11、Current transformer
Switch
Controlling cable
Control box
Earthing cable
Installation of circuit breaker
