| Brand | ROCKWILL |
| Series | RHB |
| Rated voltage | 550kV |
| Rated current | 4000A |
| Rated short-circuit breaking current | 63kA |
| Rated frequency | 50/60Hz |
| Parameter | Unit | Value | |
|---|---|---|---|
| Rated voltage | kV | 550 | |
| Rated current | A | 4000 | |
| Rated frequency | Hz | 50/60 | |
| Rated operating sequence | O-0.3s-CO-180s-CO | ||
| 1 min power frequency withstand voltage (RMS) | Phase-to-earth | kV | 740 |
| Across isolating distance | kV | 740 (+210) | |
| Phase-to-phase | kV | 740 | |
| Rated lightning impulse withstand voltage (peak) | Phase-to-earth | kV | 1675 |
| Across isolating distance | kV | 1675 (+315) | |
| Phase-to-phase | kV | 1675 | |
| Rated short-circuit breaking current | kA | 63 | |
| Rated short-circuit making current (peak) | kA | 158 | |
| Rated short-time withstand current (RMS) | kA | 63 | |
| Rated short-time duration | s | 3 | |
| Opening time | ms | 20 ± 3 | |
| Closing time | ms | 65 ± 15 | |
| CO (Close-Open) interval | ms | 45 ± 5 | |
| Mechanical life | times | 5,000 (between M1 and M2) | |
| Electrical endurance (rated short-circuit breaking operations) | times | 20 | |
| Rated SF6 filling pressure (20 °C) | Interrupter compartment | MPa | 0.6 |
| Support column | MPa | 0.4 | |
| SF6 alarm pressure (20 °C) | Interrupter compartment | MPa | ≤ 0.52 |
| Support column | MPa | ≤ 0.35 | |
| SF6 lockout pressure (20 °C) | Interrupter compartment | MPa | ≤ 0.48 |
| Support column | MPa | ≤ 0.32 | |
| Parameter | Standard Capability |
|---|---|
| Maximum installation altitude | ≤ 2,000 m (above mean sea level) |
| Ambient temperature range | –30 °C to +40 °C |
| Pollution level | Class IV (heavy pollution, per IEC 60815) |
| Wind load withstand capability | 34 m/s |
| Seismic withstand level | 0.5 g (AG5 equivalent) |
The RHB-550 is designed for 500 kV / 550 kV transmission systems and is suitable for the following applications:
live tank circuit breaker is a structural form of high-voltage circuit breaker, which is characterized by the use of ceramic insulation pillars to support key components such as arc extinguishing chamber and operating mechanism. The arc extinguishing chamber is usually arranged on the top or pillar of the ceramic pillar. It is mainly suitable for medium and high voltage power systems, with voltage levels covering the range of 72.5 kV to 1100 kV. live tank circuit breakers are common control and protection equipment in outdoor distribution devices such as 110 kV, 220 kV, 550 kV, and 800 kV substations.
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.
Login
