Description
Description of ZW8-12 Series Outdoor High-voltage Vacuum Circuit Breaker
The ZW8-12 Series Outdoor High-voltage Vacuum Circuit Breaker is a specialized outdoor high-voltage switching device engineered for three-phase AC 50Hz power systems, with a rated voltage of 12KV. It is primarily designed to safely interrupt and close load currents, overload currents, and short-circuit currents in rural power grids, urban power grids, and small-scale power systems, serving as a core component for grid stability and fault protection.
Adopting a three-phase common tank structure, the breaker houses three-phase vacuum interrupters within a metal cabinet, utilizing SMC insulating material to achieve reliable phase-to-phase and phase-to-ground insulation. This structural design not only enhances insulation strength but also ensures long-term stable operation in harsh outdoor environments.
The ZW8-12G variant, a combined circuit breaker integrating the ZW8-12 breaker with an isolating switch, offers flexible application as a section switch and supports both built-in and external PT configurations, with an optional self-contained power supply for enhanced adaptability. Equipped with the CT23 spring energy storage operating mechanism, the entire series provides both electric and manual operation modes to meet diverse on-site operation needs.
Parameter of ZW8-12 Series Outdoor High-voltage Vacuum Circuit Breaker
| order number | name | unit | data | |||
| 6.3KA | 12.5KA | 20KA | ||||
| 1 | rated voltage | kV | 12 | |||
| 2 | maximum operating voltage | kV | 12 | |||
| 3 | rated current | A | 630 | |||
| 4 | rated short-circuit breaking current | kA | 6.3 | 12.5 | 20 | |
| 5 | rated short-circuit closing current (peak) | kA | 16 | 31.5 | 50 | |
| 6 | rated peak current rating | kA | 16 | 31.5 | 50 | |
| 7 | rated short-time 1-minute withstand current | kA | 6.3 | 12.5 | 20 | |
| 8 | rated insulation level | Power frequency withstand voltage (dry type) | kV | 42 | ||
| lightning impulse withstand voltage (peak) | 75 | |||||
| 9 | rated operating sequence | Split-0.3S-Split-180S-Split | ||||
| 10 | institutional life | Next | 10000 | |||
| 11 | rated short-circuit breaking current switching cycles | Next | 30 | |||
| 12 | rated closing voltage of the operating mechanism | V | 110,220 | |||
| 13 | rated operating voltage | V | 110,220 | |||
| 14 | clearance between open contacts | mm | 11±1 | |||
| 15 | overtravel (length of contact spring compression) | mm | 3 | |||
| 16 | three-phase separation, asynchronous closing | ms | ≤2 | |||
| 17 | contact closing bounce time | ms | ≤2 | |||
| 18 | average breaking speed | m/s | 1.0±0.2 | |||
| 19 | average closing speed | m/s | 0.7±0.15 | |||
| 20 | time of opening | at the maximum operating voltage | S | 0.015-0.05 | ||
| at minimum operating voltage | 0.03-0.06 | |||||
| 21 | closing time | S | 0.025-0.05 | |||
| 22 | Resistance of each phase main circuit (Resistance of the main circuit of the combined circuit breaker) | μΩ | ≤120(≤200) | |||
| 23 | allowable cumulative thickness of dynamic and static contacts | mm | 3 | |||
Feature of ZW8-12 Series Outdoor High-voltage Vacuum Circuit Breaker
The ZW8-12 Series Outdoor High-voltage Vacuum Circuit Breaker boasts multiple competitive features that make it stand out in outdoor high-voltage applications. Firstly, its vacuum arc-extinguishing technology ensures efficient and reliable arc interruption, with no arc pollution, low noise, and long service life, adapting to frequent switching operations.
Secondly, the SMC insulating material enhances insulation reliability and weather resistance, enabling stable operation in extreme outdoor environments (high temperature, low temperature, humidity, dust) without frequent maintenance. Thirdly, the three-phase common tank structure optimizes spatial layout, making the product compact, lightweight, and easy to install and transport.
Fourthly, the CT23 spring energy storage operating mechanism offers dual operation modes (electric and manual), ensuring operational flexibility—electric operation for regular use, manual operation as a backup for power outages. Finally, the ZW8-12G combined variant integrates an isolating switch and optional PT configuration, realizing multi-functional integration (sectioning, voltage monitoring) and meeting diverse intelligent power distribution needs.
