252kV outdoor self-energy power high voltage SF6 circuit breaker
Key attributes
| Brand | ROCKWILL |
| Series | RHB |
| Rated voltage | 252kV |
| Rated current | up to 5000A |
| Rated peak withstand current | up to 158 kA |
| Rated frequency | 50/60 HZ |
Description
RHB-252kV outdoor self-energy SF₆ live tank circuit breaker is developed for 252kV, 50Hz AC three-phase power grid, used for grid connection, circuit switching as well as overload & short-circuit protection of transmission lines and transformer stations.
Adopting SF₆ as insulating & arc-quenching medium, it is equipped with self-blast double-action interrupter and optimized spring operating mechanism.
Featuring outstanding breaking performance, low operating energy consumption, low running noise and high operational stability, all technical parameters comply with IEC & GB standards.
The whole set applies three-phase post porcelain insulator layout with one shared spring mechanism for triple-pole mechanical linkage.
This integrated linkage design simplifies mechanical structure, improves synchronous operation accuracy of three poles and avoids independent single-pole malfunction effectively.
Main Characteristics
Self-blast Arc Extinguishing Structure：Double-action arc-quenching chamber guarantees stable breaking performance under various load and fault current conditions.
Low Drive Power & Long Mechanical Life：Small required operating work; mechanical service life reaches over 10,000 switching cycles for long-term outdoor running.
High-performance Integral Arc Contact：Integral sintered copper-tungsten arc contact features excellent high-temperature resistance and anti-ablation capacity, capable of enduring more than 20 rated short-circuit breaking cycles.
Excellent Air-tightness & Insulation Performance：Precision sealing design ensures annual SF₆ leakage rate＜0.5%; strict internal drying treatment keeps gas moisture far below standard requirement; specific creepage distance above 31mm/kV for superior outdoor anti-pollution insulation.
Premium Interrupter Raw Materials：Lightweight zinc alloy valve sheet stabilizes internal airflow; imported PTFE composite nozzle greatly improves arc ablation resistance and reliable arc extinction.
High-quality Matching Parts：Pointer-type SF₆ density relay and secondary electrical components adopt well-known joint-venture/imported brands for stable on-line gas monitoring and high running reliability.
High-strength Spring Operating Mechanism：Core structural parts made of high-strength forged alloy steel with good wear resistance, low failure rate under frequent operation.
Main technical parameters
| Rated voltage | kV | 252 |
| Rated frequency | Hz | 50/60 |
| Rated current | A | up to 5000 |
| Rated short-time withstand current, up to 3 s | kA | up to 63 |
| Rated peak withstand current | kA | up to 158 |
| Rated short-duration power-frequency withstand voltage, 1 min | kV | 460 |
| Power-frequency withstand voltage, 1 min across open contacts | kV | 530 |
| Rated lightning impulse withstand voltage, 1.2/50 μs | kV | 1050 |
| Rated lightning impulse withstand voltage, 1.2/50 μs, across open contacts | kV | 1200 |
| Rated filling pressure (abs. at 20 ℃) circuit-breaker | MPa | 0.6 |
| Minimum functional pressure (abs. at 20 ℃) circuit-breaker | MPa | 0.5 |
| Temperature range (ambient) | ℃ | -30～+40 |
| Type of installation | — | outdoor |
| Partial discharge | pC | ＜5 |
| SF₆ annual leakage rate | — | ＜0.5% |
| Maintenance cycle | Year | 30 |
Outline Dimension Drawing
Order Instruction
Circuit breaker model & specification
Rated electrical parameters: rated voltage, rated current, short-circuit breaking current
Service ambient condition: ambient temperature, installation altitude, pollution grade
Control parameters: energy storage motor voltage, opening/closing coil rated voltage
Primary terminal wiring direction
Spare parts and special tools (ordered separately as required)
Documentation Resource Library SF6 circuit breaker
FAQ for SF6 circuit breaker
ABB’s high-voltage live-tank vacuum breakers are reliable but costly with long lead times. Hitachi Energy is mature yet lacks local high-voltage track records and smart features. Schneider Electric excels in 40.5kV distribution but is limited in voltage range and extreme performance. In contrast, Rockwill offers up to 363kV SF₆-free vacuum solutions with fast local service and spare parts delivery. Featuring robust mechanisms, full smart functions, and superior resistance to extreme cold, heavy salt fog, and short-circuit currents, our breakers ensure long maintenance-free service and lower LCC.
Q:Can Rockwill custom-engineer or modify Live tank Vacuum circuit breaker specifications to meet project-specific requirements?
A:
Rockwill provides comprehensive customized design and parameter modification for live tank vacuum circuit breakers to meet diverse project requirements. Backed by our professional R&D team, we flexibly adjust product structures, technical parameters and environmental adaptability, delivering exclusive tailored solutions in line with various on-site conditions and project standards.
In a live tank breaker, the arc chamber is mounted at the top or side of the column, exposed to ambient air. In a dead tank breaker, the arc chamber is placed inside the metal tank, fully sealed.
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