ZW32-35kV/630A Outdoor High Voltage Vacuum Circuit Breaker | 35kV Overhead Line Core Distribution Equipment
1 Overview
ZW32-35kV/630A Outdoor High Voltage Vacuum Circuit Breaker (i.e. ZW32-40.5 type) adopts uniquely designed integrated solid-sealed poles and high-reliability operating mechanism, serving as the core distribution equipment for medium-voltage overhead line power grids. This circuit breaker is mainly used for making and breaking load current, overcurrent and short-circuit current, widely applied in power system distribution network renovation, industrial park power supply, residential community distribution, wind power and photovoltaic grid connection and other scenarios, providing reliable guarantee for safe and stable operation of the power grid.
This model product has the following core advantages, suitable for various outdoor complex power supply environments, meeting the distribution needs of different users:
- Extremely high reliability: Integrated solid-sealed pole design effectively isolates outdoor dust and moisture, avoids aging of internal components, reduces fault occurrence rate, suitable for harsh outdoor working environments (pollution level Class IV).
- Full-life maintenance-free: Optimized structural design reduces wearing parts, eliminates the need for frequent maintenance, significantly reduces user operation and maintenance costs, improves distribution efficiency.
- High mechanical and electrical life: Mechanical life up to 10000 times, rated short-circuit current breaking times 30 times, long-term stable operation not easily damaged, extends product service life.
- Compact and easy to install: Small overall size, light weight (approx. 450kg), no complex installation equipment required, saves installation space and construction costs, suitable for various outdoor pole-mounted installation scenarios.
1.1 Service Conditions
- Ambient air temperature: -30degC to +60degC;
- Altitude: not exceeding 3000m;
- Wind speed not exceeding 34m/s;
- Vibration or earth movement from external sources is negligible;
- Pollution level: Class IV;
- Storage temperature: -40degC to +85degC.
1.2 Technical Parameters
Circuit Breaker Main Technical Parameters
| No. |
Item |
Unit |
Value |
| 1 | Rated Voltage | kV | 40.5 |
| 2 | Rated Current | A | 1250/1600 |
| 3 | Rated Frequency | Hz | 50 or 60 |
| 4 | Power Frequency Withstand Voltage 1min (Wet/Dry)
Between phases, to earth / across gap | kV | 80 / 95/95 |
| 5 | Lightning Impulse Withstand Voltage (Peak)
Between phases, to earth / across gap | kV | 185 |
| 6 | Rated Short-circuit Breaking Current | kA | 25/31.5 |
| 7 | Rated Short-circuit Making Current (Peak) | kA | 63/80 |
| 8 | Rated Peak Withstand Current | kA | 63/80 |
| 9 | 4S Short-time Withstand Current | kA | 25/31.5 |
| 10 | Rated Operating Cycle | - | Open-0.1s-Close-Open-3s-Close-Open-6s-Close-Open-60s Recovery |
| 11 | Rated Short-circuit Current Breaking Times | times | 30 |
| 12 | Mechanical Life | times | 10000 |
| 13 | Mechanism Control Voltage | V | AC/DC220V |
| 14 | Secondary Circuit 1min Power Frequency Withstand Voltage | kV | 2 |
Circuit Breaker Main Mechanical Parameters
| No. | Parameter Name | Unit | Data |
|---|
| 1 | Contact Gap | mm | 16±1 |
| 2 | Contact Overtravel | mm | 4±0.5 |
| 3 | Opening Speed | m/s | 1.4-1.8 |
| 4 | Closing Speed | m/s | 0.4-0.8 |
| 5 | Contact Closing Bounce Time | ms | ≤5 |
| 6 | Phase Center Distance | mm | 600±2 |
| 7 | Three-phase Opening/Closing Non-synchronism | ms | ≤2 |
| 8 | Each Phase Conductive Circuit Resistance | μΩ | ＜80 |
| 9 | Closing Time | ms | 25～45 |
| 10 | Opening Time | ms | 20～45 |
| 11 | Weight | kg | approx. 450 |
2 Circuit Breaker Structure and Working Principle
The ZW32-35kV/630A outdoor high voltage vacuum circuit breaker (ZW32-40.5 type) mainly consists of integrated solid-sealed poles, current transformers, operating mechanism and enclosure. This model circuit breaker is of compact design, with the enclosure made of high-quality stainless steel, featuring excellent corrosion resistance and aging resistance. Current transformers can be selected with different ratios and accuracy classes according to user needs, facilitating matching with relay protection and intelligent distribution terminals (FTU).
Working principle: The operating mechanism drives the moving contact of the vacuum interrupter through connecting rods to achieve circuit making and breaking. The vacuum interrupter adopts advanced solid-sealing technology, integrally casting the vacuum interrupter and insulating pole, significantly improving insulation performance and mechanical strength. During opening, the mechanism drives the contacts to separate rapidly, and the arc is quickly extinguished in the vacuum medium; during closing, the contacts are pressed tightly to ensure low-resistance conduction. The integrated poles combined with the maintenance-free mechanism ensure long-term reliable operation of the ZW32-35kV/630A circuit breaker in outdoor environments.
This product fully complies with GB/T 1984-2014 "High-voltage AC Circuit Breakers" and IEC 62271-100 standards, making it the preferred protection equipment for 35kV overhead lines, substation incoming/outgoing lines and user distribution projects.
ZW32-35kV/630A Outdoor High Voltage Vacuum Circuit Breaker | 35kV Overhead Line Core Distribution Equipment
