Customization Dead tank SF6 Gas Circuit-Breaker 362kV- 420kV
Key attributes
| Brand | ROCKWILL |
| Series | RHD |
| Rated maximum voltage | 362kV/420kV |
| Rated maximum current | 3150-5000A |
| Lightning impulse withstand voltage | 1175-1560kV |
| Rated peak withstand current | 100-158kA |
| Rated frequency | 50/60Hz |
Description
The RHD Series Dead-Tank SF6 Circuit Breaker is engineered for 'customized high-voltage power system solutions', covering standard voltage grades from RHD-362 to RHD-420 and supporting 'non-standard voltage customization' to precisely match your unique grid upgrade or construction needs. As a dead-tank type, its grounded tank isolates high-voltage components, ensuring superior insulation performance and safety-making it the go-to choose for demanding high-voltage scenarios.
Key features
- Superior Seismic Resistance：Adopting a low-center-of-gravity design, the breaker can withstand an earthquake intensity of up to 9 degrees, ensuring stable performance in seismic-prone areas--consistent with the RHD series' proven anti-seismic capability.
- Excellent Arc-Extinguishing Performance & Long Service Life：Leveraging the high arc-extinguishing efficiency of SF6 gas, the breaker achieves a rated short-circuit breaking current of ≥50kA. It boasts an electrical life of more than 20 operations and a mechanical life of up to 10,000 cycles, significantly reducing equipment replacement and maintenance costs.
- Low SF6 Gas Leakage Rate：The hermetic metal tank structure minimizes SF6 gas leakage, with an annual leakage rate of ≤1%--far below industry averages. This design not only avoids safety hazards from gas leakage but also reduces environmental impact.
- Modular Design & Flexible Expansion：It supports on-demand configuration of built-in current transformers (CTs), with up to 15 CTs available for measurement or protection purposes. The standardized module interface allows flexible combination to meet diverse substation design and layout requirements, especially suitable for space-constrained scenarios.
- Strong Environmental Adaptability：The breaker operates stably in extreme conditions: ambient temperature ranging from -40℃ to +55℃, maximum daily temperature difference of 32K, altitude up to 3,000m, and air pollution level up to Class IV. It also resists wind pressure of 700Pa (equivalent to 34m/s wind speed) and icing thickness of up to 20mm.
- Comprehensive Safety Protection：Equipped with anti-mis operation interlocking devices, it effectively prevents accidents caused by incorrect operations. Before delivery, the breaker undergoes lightning impulse tests to eliminate insulation discharge risks from production and assembly, ensuring reliable quality.
- Maintenance-Free Operating Mechanism：It adopts a spring-operated mechanism that is oil-free, gas-free, and maintenance-free. This mechanism delivers stable performance, low noise, and high reliability, reducing long-term operational workload.
Operation Mechanism
The enclosure has been verified to meet IP55 (dust-proof and water-jet resistant) and IK10 (impact-resistant) protection ratings, and is designed to operate across a wide temperature range from -40℃ to 55℃.
The cabinet adopts an integrated bending technique, offering an artistic appearance, high structural strength, and excellent impermeability. All internal components are sourced from internationally renowned brands, ensuring reliable quality and long-term stable performance.
Technology Parameters
| Rated maximum voltage | 362 kV | 420 kV |
| Rated maximum current | 3150···5000 A | 3150‑5000 A |
| Rated frequency | 50/60 Hz | 50/60 Hz |
| Lightning impulse withstand voltage | 1175/1290 kV | 1425/1560 kV |
| Rated short‑circuit breaking current | 40···63 kA | 50‑63 kA |
| Rated peak withstand current | 100~158 kA | 125‑158 kA |
| Creepage distance | mm/kV | 25‑31 mm/kV |
| Partial discharge | ≤10 pC | ≤10 pC |
| Opening time | ≤30 ms | ≤30 ms |
| Alarm/blocking pressure | 0.55/0.50 MPa | 0.55/0.50 MPa |
| Gas moisture content | ≤150 ppm(v) | ≤150 ppm(v) |
| Heater voltage | AC220 V | AC220 V |
| Voltage of energy‑store motor | DC110/220 V | DC110/220 V |
| 1min Power frequency withstand voltage | 510/585 kV | 630/720 kV |
| First open pole factor | 1.3 | 1.3 |
| Rated short‑circuit duration | 3 s | 3 s |
| Rated cable/line charging breaking current | 315···400 A | 400‑500 A |
| Rated making current (peak) | 100···158 kA | 125‑158 kA |
| Operation sequence | O‑0.3s‑CO‑180s‑CO | O‑0.3s‑CO‑180s‑CO |
| Breaking time | ≤60 ms | ≤60 ms |
| Closing time | ≤100 ms | ≤100 ms |
| Rated SF₆ gas pressure | 0.6···0.7 MPa | 0.6‑0.7 MPa |
| SF₆ annual gas leakage rate | ≤0.5% | ≤0.5% |
| Mechanical life | 10000 times | 10000 times |
| Voltage of control circuit | DC110/220 V | DC110/220 V |
| Applied standards | GB/T 1984 / IEC 62271‑100 | GB/T 1984 / IEC 62271‑100 |
362 kV Dead‑Tank SF₆ Circuit‑Breaker Drawings
Environmental Conditions
| Ambient temperature range | –40 to +55 °C (max daily variation 32 K) |
| Altitude above sea level | ≤ 3000 m |
| Pollution level | Class IV |
| Wind pressure | 700 Pa (≈ 34 m/s) |
| Ice accretion thickness | ≤ 20 mm |
| Seismic intensity | 9 degrees |
| Relative humidity (24h avg) | ≤ 95% |
| Relative humidity (monthly avg) | ≤ 90% |
| Water vapor pressure (24h avg) | ≤ 2.2 kPa |
| Water vapor pressure (monthly avg) | ≤ 1.8 kPa |
| Solar radiation | ≤ 1000 W/m² |
Application Scenarios
- Large Hub Substations：Ideal for 220kV+ key hub substations, the customized RHD breaker controls and protects main power circuits. Its non-standard voltage adaptability ensures seamless integration into existing or upgraded grid architecture.
- New Energy Grid-Connection Systems：Suitable for high-voltage grid connections in wind and solar power bases. Custom voltage ratings ensure reliable integration of renewable energy into the main grid, even in projects with unique voltage requirements.
- Industrial High-Voltage Power Systems：Perfect for heavy industries (metallurgy, chemicals) with specialized voltage needs. The breaker’s robust performance and customizability guarantee stable power supply for high-power industrial equipment.
Documentation Resource Library Dead Tank Circuit Breaker
FAQ for Dead Tank Circuit Breaker
Live tank breakers are well-suited for outdoor high-voltage distribution with a dispersed layout. Dead tank breakers flexibly adapt to both indoor and outdoor applications, especially in space-constrained substations or where compact installation is required.
The interrupter is typically installed inside the tank, resulting in a highly compact overall structure that enables efficient arc quenching within a limited space. Depending on the arc extinguishing principle and technical approach, the specific configuration of the interrupter may vary, but all designs include core components such as moving/stationary contacts, a nozzle, and insulating parts. During opening operation to interrupt the current, these components work together to achieve fast and reliable extinction of the arc.
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