Ring Main Unit (RMU), Series XGN15-12
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Series XGN15-12 ring main units (RMU) are 3-phase AC 12kV, 50Hz, main and branch busbar series indoor power distribution devices. They are widely used in load center substations and box type substations in factories, residential areas and high-rise buildings to control and protect power systems. This equipment series is equipped with SF6 load break switches, and when compared to other similar products, feature a better insulation and arc quenching performance, ensuring the short circuit breaker and improved safety levels, thus guaranteeing a safe, reliable performance.
Technical parameters
| Project | Unit | Data |
| Rated voltage | KV | 12 |
| Rated frequency | HZ | 50 |
| Rated current | A | 630 |
| Maximum fuse current | A | 125 |
| Rated short-time withstand Current | KA | 25 |
| Rated duration of short circuit | S | 4 |
| Rated peak withstand current | KA | 63 |
| Rated short-circuit making current | KA | 63 |
| Rated active load breaking current | A | 630 |
| Closed loop breaking current | A | 630 |
| Rated cable charging current | A | 10 |
| Main circuit resistance | μΩ | ≤ 150 |
| Transfer current | A | 1700 |
| Rated short circuit breaking current | KA | 50 |
| Main loop resistance (without fuse) | Μω | ≤ 250 |
| Earthing switch rated short time withstand current | KA | 25 |
| Earthing switch rated duration of short-circuit | S | 3 |
| Earthing switch rated peak withstand current | KA | 63 |
| Protection class | | IP3X |
Working conditions
| Item | Data |
| Ambient temperature | -10℃- +40℃ |
| Ambient humidity | Daily average humidity≤2.2x10-3MPa |
| Altitude | ≤1000m |
| Others | Seismic intensity: ≤ magnitude 8; the place without fire and explosion danger, serious pollution, chemical corrosion and strenuous vibration |
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