| Brand | ROCKWILL |
| Series | RHB |
| Rated voltage | 123kV/145kV |
| Rated current | up to 4000kA |
| Rated peak withstand current | up to 158 kA |
| Rated frequency | 50/60Hz |
The Live tank SF6 gas circuit breaker (equipped with CT - type spring operating mechanism) is an outdoor three - phase AC 50HZ high - voltage power transmission equipment.It is used to interrupt and close the rated current, interrupt the fault current, or switch the circuit, so as to achieve the control and protection of the power transmission line.
This circuit breaker can not only perform single - pole opening, closing, and fast auto - reclosing operations, but also, through the electrical interlocking among the three poles, conduct three - pole opening, closing, and fast auto - reclosing operations.The circuit breaker adopts the Live tank SF6 gas circuit breaker principle and has the characteristics of simple structure, low required operating power, high reliability, easy installation, and low noise.
Three-phase post porcelain insulator with common single-spring mechanism, compact outdoor layout.
SF₆ serves as insulation & arc-quenching medium; three poles gas interlinked for stable performance.
Fitted with pointer density relay for real-time gas pressure & density monitoring.
Self-blast arc extinction reduces operating power and boosts mechanical efficiency.
Customized design available per client’s specific project demands.
Each pole column is an airtight unit. From top to bottom, the pole columnis composed of the upper outgoing line plate, arc quenching chamber,lower outgoing line plate, supporting porcelain bushing, insulating tie rod,direct - acting seal, and mechanism operation shaft.
| Item | Unit | Parameter | |
|---|---|---|---|
| Rated voltage | kV | 123 | 145 |
| Rated frequency | Hz | 50/60 | |
| Rated current | A | up to 4000 | |
| 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 | 230 | 275 |
| Power-frequency withstand voltage, 1 min across open contacts | kV | 265 | 315 |
| Rated lightning impulse withstand voltage, 1.2/50 μs | kV | 550 | 650 |
| Rated lightning impulse withstand voltage, 1.2/50 μs, across open contacts | kV | 650 | 750 |
| 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 capacity | pC | <5 | |
| SF₆ leakage rate per year | — | <0.5% | |
| Maintenance cycle | Year | 30 | |
Ambient temperature: -25℃ ~ +40℃
Altitude: <1000m
Wind speed: <34m/s
Daily temperature difference: <25℃
Solar irradiance: <0.1w/cm²
Monthly average relative humidity: <90%
Ice-coating thickness: <10mm
Seismic acceleration resistance: Horizontal <0.2g, vertical <0.1g
Installation location: Outdoor
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.
A live tank breaker relies on porcelain columns, air, or composite insulating materials for phase-to-ground insulation. A dead tank breaker uses SF₆ (or other insulating gases) inside a sealed metal tank, providing high insulation strength unaffected by external humidity or contamination.
A live tank breaker (also called a porcelain column breaker) mounts its core components on top of porcelain insulators with an open, visible layout. A dead tank breaker encloses all core parts — including the arc extinguishing chamber and current path — inside a grounded metal tank, achieving a highly integrated and compact structure.
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