| Brand | ROCKWILL |
| Model NO. | EHV Dead tank SF6 circuit breaker source manufacturer-800kV |
| Rated voltage | 800kV |
| Rated normal current | 5000A |
| Rated frequency | 50/60Hz |
| Series | RHD |
800kV Dead Tank SF6 Circuit Breaker is a high-performance ultra-high voltage device designed for critical power transmission systems. Featuring a robust dead tank structure, its live components are sealed in an SF6 gas-insulated metal casing, delivering superior arc extinction efficiency and dielectric strength to rapidly interrupt fault currents and ensure grid stability.
The low-center-of-gravity design enhances seismic resistance, adapting to extreme climates and rugged terrains. Integrated with bushings and current transformers, it supports multi-function control for real-time measurement and protective switching.
With a mechanical/electrical lifespan exceeding 30 years and a fully sealed design, maintenance frequency is minimized, cutting operational costs. Equipped with anti-misoperation interlocks and dual-insulation safeguards, it prioritizes personnel safety and system reliability. Ideal for UHV grids, power plants, and industrial applications, this breaker sets a benchmark for efficiency and durability in 800kV high-stress environments.
Exceptional Arc Extinction and Insulation: Using SF6 gas as the medium, it enables rapid arc extinction and has strong insulation properties. It can quickly interrupt fault currents, ensuring stable operation under high - voltage conditions.
Robust Dead - tank Structure: With a dead - tank design, the live parts are sealed in a metal tank, providing resistance to vibration, dust, and moisture, and enabling adaptation to harsh environments.
Integrated Functional Configuration: Integrates components such as bushings and current transformers, with functions like measurement and protection, simplifying the system layout.
Long Service Life and Low Maintenance: Boasts long mechanical and electrical service lives. The sealed structure reduces component aging, resulting in a long maintenance cycle and low costs.
Multiple Safety Guarantees: Equipped with anti - misoperation interlocking devices and multiple insulation protections to ensure the safety of personnel and equipment.
| Rated voltage |
kV |
800kV |
||
| Rated current |
A |
5000 |
||
| Rated frequency |
Hz |
50/60 |
||
| Rated short - circuit breaking current |
kA |
50kA、63kA |
||
| Rated short - time withstand current and duration |
kA/s |
50/3 |
63/2 |
|
| Rated peak withstand current |
kA |
135 |
171 |
|
| Rated short - circuit making current |
kA |
135 |
171 |
|
| Number of breaks |
2 |
|||
| Rated lightning impulse withstand voltage (peak value) |
To ground |
kV |
2100 |
|
| Break |
2750 |
|||
| Rated switching impulse withstand voltage (peak value) |
To ground |
kA |
1550 |
|
| Break |
1950 |
|||
| Rated short - time power - frequency withstand voltage (effective value) |
To ground |
kA |
960 |
|
| Break |
1420 |
|||
| Ambient air temperature upper limit | +40 °C |
| Ambient air temperature 24-hour average | +35 °C |
| Ambient air temperature lower limit | –25 °C |
| Altitude above sea level | ≤ 1000 m |
| Relative humidity (24-hour average) | ≤ 95% |
| Relative humidity (monthly average) | ≤ 90% |
| Water vapor pressure (24-hour average) | ≤ 2.2 kPa |
| Water vapor pressure (monthly average) | ≤ 1.8 kPa |
| Solar radiation | ≤ 1000 W/m² |
| Pollution level | Level III |
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.
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.
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.
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