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The 27.5kV single pole vacuum circuit breaker—also known as the Model ZW7 single phase circuit breaker—is primarily utilized in railway power supply systems. This product is characterized by its single-pole configuration, compact size, and lightweight design. Anqiang's single phase circuit breakers are widely exported to regions including Europe, Southeast Asia, and Russia. Owing to the unique operational characteristics of vacuum circuit breakers, they are particularly well-suited for applications requiring frequent switching operations as well as for oil-free retrofit projects.
|
Parameter Name |
Numerical Value |
|
Rated Voltage |
27.5KV |
|
Rated Frequency |
50 Hz |
|
Rated Current |
630/1250/1600/2000/2500 A |
|
Rated Short-Circuit Breaking Current |
20/25/31.5 KA |
|
Rated Short-Circuit Making Current (Peak) |
50/63/80 KA |
|
Rated Dynamic Stability Current (Peak) |
50/63/80 KA |
|
Rated Thermal Stability Current (RMS) |
20/25/31.5 KA |
|
Rated Short-Circuit Breaking Current Time |
30 times |
|
Rated Thermal Stability Time |
4 s |
|
Rated Operating Sequence |
CO-0.3S-CO-180s-CO |
|
Mechanical Life |
10000 times |
|
Permissible Contact Wear Thickness |
4 mm |
|
Secondary Circuit 1-Minute Power-Frequency Withstand Voltage |
2 KV |
|
Weight |
500/750 Kg |
|
Name |
Numerical Value |
|
Clearance between open contacts |
18±1 mm |
|
Contact over-travel |
4 ±1 mm |
|
Interphase center distance |
700±1 .5mm |
|
Bouncing time of closing contact |
≤5ms |
|
Three-phase on-off asynchrony |
≤2ms |
|
Opening time |
≤50ms |
|
Closing time (electric closing) |
≤100ms |
|
Average opening speed |
1.4-1.8m/s |
|
Average closing speed |
0.9-1.1 m/s |
|
Resistance of each phase conductive circuit |
≤50 μΩ |
Unlike the three-phase ZW7 model, the ZW7 single pole vacuum circuit breaker consists of a vacuum interrupter, composite silicone rubber or porcelain insulating pillars, a compact spring operating mechanism housing, built-in or external current transformers (CTs), and upper and lower outgoing terminals. The entire unit features excellent sealing performance, a compact size, and light weight, facilitating easy installation on utility poles or towers.
1. Overseas railway projects utilizing 27.5kV power systems;
2. Power supply for ground-level and elevated sections of urban rail transit systems operating at 27.5kV;
3. Feeder switches for traction substations, sectioning posts, and switching stations in electrified railways.
Address
Jinlu Industrial Zone, Beibaixiang Town, Yueqing City, Wenzhou City, Zhejiang Province, China
