Factory Direct Dead tank SF6 circuit breaker-40.5kV to 72.5kV
Key attributes
| Brand | ROCKWILL |
| Series | RHD |
| Rated maximum voltage | 40.5kV/72.5kV |
| Rated maximum current | 1600-3150 A |
| Rated short-circuit breaking current | 25-50kA |
| Rated frequency | 50/60Hz |
Description
Product Overview
We are a leading manufacturer in China's dead tank circuit breaker industry, specializing in the research, development, and production of high-voltage switchgear. With decades of technical accumulation and continuous innovation, our products are trusted by major power projects worldwide.
The 40.5kV to 72.5kV dead tank SF₆ circuit breaker is a new generation of outdoor high-voltage electrical equipment developed with independent intellectual property rights. It is composed of inlet and outlet bushings, built-in current transformers, interrupters, a frame, and a spring operating mechanism. Its advanced technology and quality reliability have reached domestic leading and internationally advanced levels. The product is particularly suitable for cold climates and high-altitude regions.
Core Features
- Superior Electrical Performance：Exceptional breaking and closing capabilities with rapid arc extinction and long electrical lifespan (E2 class, >20 short-circuit operations), ensuring stable operation of power systems.
- Compact & Robust Dead Tank Design：Dead tank structure encloses all live parts in an SF₆-filled grounded metal tank, offering a low center of gravity, high seismic resistance, and adaptability to diverse installation environments with minimal footprint.
- Excellent Environmental Adaptability：Leveraging SF₆ gas's superior insulation and arc-quenching properties, the breaker operates reliably from –40°C to +55°C. Suitable for cold climates, high altitudes, and heavily polluted areas. reduces maintenance frequency and lifecycle costs, extending equipment service life.
- Enhanced Safety Features“”Equipped with comprehensive interlocking devices and insulation protection to prevent maloperations. SF₆ gas insulation eliminates internal discharge and flashover risks, safeguarding both personnel and equipment.
Technical Parameters
| Item | Unit | 40.5 kV |
|---|---|---|
| Rated maximum voltage | kV | 40.5 |
| Rated maximum current | A | 1600~3150 |
| Rated frequency | Hz | 50/60 |
| Lightning impulse withstand voltage | kV | 185/215 |
| Rated short-circuit breaking current | kA | 25~31.5 |
| Rated peak withstand current | kA | 80~100 |
| Creepage distance | mm/kV | 25~31 |
| Partial discharge | pC | ≤10 |
| Opening time | ms | ≤30 |
| Alarm/blocking pressure | MPa | 0.45/0.40 |
| Gas moisture content | ppm(v) | ≤150 |
| Heater voltage | V | AC220 |
| Voltage of energy-store motor | V | DC110/220 |
| 1min Power frequency withstand voltage | kV | 95/118 |
| First open pole factor | — | 1.5 |
| Rated short-circuit duration | s | 4 |
| Rated cable/line charging breaking current | A | 100~160 |
| Rated making current (peak) | kA | 80~100 |
| Operation sequence | — | O-0.3s-CO-180s-CO |
| Item | Unit | 72.5 kV |
|---|---|---|
| Rated maximum voltage | kV | 72.5 |
| Rated maximum current | A | 2000~3150 |
| Rated frequency | Hz | 50/60 |
| Lightning impulse withstand voltage | kV | 325/375 |
| Rated short-circuit breaking current | kA | 31.5~50 |
| Rated peak withstand current | kA | 100~125 |
| Creepage distance | mm/kV | 25~31 |
| Partial discharge | pC | ≤10 |
| Opening time | ms | ≤30 |
| Alarm/blocking pressure | MPa | 0.45/0.40 |
| Gas moisture content | ppm(v) | ≤150 |
| Heater voltage | V | AC220 |
| Voltage of energy-store motor | V | DC110/220 |
| 1min Power frequency withstand voltage | kV | 140/160 |
| First open pole factor | — | 1.5 |
| Rated short-circuit duration | s | 4 |
| Rated cable/line charging breaking current | A | 160~200 |
| Rated making current (peak) | kA | 100~125 |
| Operation sequence | — | O-0.3s-CO-180s-CO |
Service environment
- Ambient temperature: -40℃ ~ +55℃
- Humidity: Daily average humidity ≤ 95%, monthly average ≤ 90%
- Wind pressure: less than 700 Pa
- Above sea level: Maximum installation altitude: 3000m.
- Earthquake intensity: not more than 9 degrees.
- Air Contamination: III grade.
- If it needs to be installed in plateau areas with an altitude higher than 1,000 meters, it is essential to consult with the manufacturer to take necessary measures to strengthen insulation during the ordering process.
- When operating in an area with a temperature of -40℃, measures need to be taken to prevent SF6 gas from liquefying.
Application Scenarios
- Transmission & Distribution Substations：Suitable for 35kV to 72.5kV substations requiring compact layout, high seismic resistance, and reliable fault interruption.
- Cold Climate & High-Altitude Regions：Designed for reliable operation in extreme cold environments (–40°C) and high-altitude plateaus with reinforced external insulation.
- Heavy Industry & Mining：Class IV pollution design ensures reliable operation in industrial zones, mining areas, and coastal environments with high contamination levels.
- Seismic Zones：Low center of gravity from the dead tank structure provides inherent seismic resilience for earthquake-prone regions.
Documentation Resource Library Dead Tank Circuit Breaker
FAQ for Dead Tank Circuit Breaker
During the normal operation and interruption processes of a circuit breaker, SF₆ gas can decompose, producing various decomposition products such as SF₄, S₂F₂, SOF₂, HF, and SO₂. These decomposition products are often corrosive, toxic, or irritating, and therefore require monitoring.If the concentration of these decomposition products exceeds certain limits, it may indicate abnormal discharges or other faults within the arc quenching chamber. Timely maintenance and handling are necessary to prevent further damage to the equipment and to safeguard personnel health.
The leakage rate of SF₆ gas must be controlled at an extremely low level, typically not exceeding 1% per year. SF₆ gas is a potent greenhouse gas, with a greenhouse effect 23,900 times that of carbon dioxide. If a leak occurs, it can not only cause environmental pollution but also lead to a decrease in the gas pressure within the arc quenching chamber, affecting the performance and reliability of the circuit breaker.
To monitor the leakage of SF₆ gas, gas leakage detection devices are typically installed on tank-type circuit breakers. These devices help to promptly identify any leaks so that appropriate measures can be taken to address the issue.
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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