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This guide explores SF6 circuit breakers, including their working principle, advantages, applications in high-voltage systems, comparison with alternative technologies, and key considerations for selecting SF6 solutions for transmission networks, substations, and industrial applications.
High Voltage Circuit Breakers
Electric Type
Normal Type Circuit Breaker
SF6
Fixed
MCCB
| Availability: | |
|---|---|
| Quantity: | |
| No. | ITEM | UNIT | VALUE |
| 01 | Rated voltage | XV | 12 |
| 02 | Rated frequency | Hz | 50 |
| 03 | Rated current | A | 630, 1000 |
| 04 | Rated short-circuit breaking current | KA | 12. 5,16,20,25 |
| 05 | Rated peak withstand current (peak) | kA | 31. 5,40,50,63 |
| 06 | Rated short-time withstand current (43) | kA | 12. 5,16,20,25 |
| 07 | Rated short-circuit closing current (peak) | kA | 31. 5,40,50,63 |
| 08 | Mechanical life | times | 10000 |
| 09 | Rated current breaking times | times | 10000 |
| 10 | Rated short-circuit breaking current breaking times | times | 30 |
| 11 | Power frequency withstand voltage (110111); phase-to-phase, phase-to-ground/break | KV | 42/49 |
| 12 | Lightning impulse withstand voltage (peak); phase-to-phase, phase-to-ground/break | kV | 75/85 |
| 13 | Secondary circuit 101111 power frequency withstand voltage | XV | 2 |
| 14 | Net weight | KG | 140 |
| No. | ITEM | UNIT | VALUE |
| 01 | Contact opening distance | mm | 9+1-0.5 |
| 02 | Contact overtravel | mm | 3+1-0.5 |
| 03 | Breaking speed | m/s | 1. 2±0. 2 |
| 04 | Closing speed | m/s | 0. 6±0. 2 |
| 05 | Contact bounce time during closing | ms | ≤2 |
| 06 | Phase-to-phase distance | mm | 135±1. 5 |
| 07 | External live air insulation distance | mm | 240±2 |
| 08 | External creepage distance | cm/kV | 3. 8 |
| 09 | Different periods of three-phase breaking | ms | ≤2 |
| 10 | Conductive circuit resistance of each phase | μΩ | ≤150 |
| 11 | Closing time | ms | ≤45 |
| 12 | Breaking time | ms | ≤45 |
| 13 | Rated power of energy storage motor | W | ≯40 |
| 14 | Rated voltage of energy storage motor | V | AC220 |
| 15 | Rated closing operation voltage | V | AC220 |
| 16 | Highest/lowest closing operation voltage | V | AC264/143 |
| 17 | Rated breaking operation voltage | V | AC220 |
| 18 | Highest/lowest breaking operation voltage | V | AC264/143 |
| 19 | Highest/lowest motor voltage | V | AC242/187 |
| 20 | Rated pressure of SF6 gas (gauge pressure) | MPa | 0 |