| Thương hiệu | ROCKWILL |
| Chuỗi | RHB |
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.
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.
| 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 |
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)
Sản phẩm series LW10B \ lLW36 \ LW58 trong sách mẫu là các công tắc đường dây sứ SF₆ dựa trên cải tiến của series ABB'LTB, với phạm vi điện áp từ 72.5kV-800kV, sử dụng công nghệ dập hồ quang tự cung cấp năng lượng Auto Buffer ™ hoặc công nghệ dập hồ quang chân không, tích hợp cơ chế hoạt động bằng lò xo/động cơ, hỗ trợ các dịch vụ tùy chỉnh đa dạng, bao gồm toàn bộ mức điện áp từ 40.5-1100kV, với thiết kế mô-đun nổi bật và khả năng tùy chỉnh mạnh mẽ, phù hợp cho các dự án yêu cầu thích ứng linh hoạt với các kiến trúc lưới điện khác nhau. Sản xuất tại Trung Quốc, với tốc độ phản hồi dịch vụ toàn cầu nhanh chóng, hiệu quả logistics cao, và độ tin cậy cao với giá cả hợp lý.
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