Overview
The LBHB-12 series of environmentally friendly gas-insulated ring main units are distribution switchgear that use vacuum arc extinguishing chambers for arc extinguishing, with environmentally friendly gas as the main insulating medium and a small amount of solid insulating support components.
Environmental protection vacuum circuit breakers: semi-solid seal, fully solid seal, (upper isolation knife, upper grounding knife, lower vacuum circuit breaker) (lower isolation knife, lower grounding knife, upper vacuum circuit breaker) can be customized according to customer requirements, State grid requirements, and project requirements. Engineering requirements: When local power supply bureaus need to select and match.
Usage environment
1. Maximum temperature : +40℃
2. Minimum temperature : -25℃
3. 24-hour average temperature : ≤35℃
4. Maximum average relative humidity: 24-hour average ≤95%, monthly average ≤90%
5. Altitude : ≤1500 meters (conventional type, under standard (dryer)(nitrogen) inflation pressure)
6. The altitude can be negotiated based on special operating conditions that exceed the normal usage environment
Technical Parameter
| Item | Vacuum circuit breaker | Isolation/grounding knife |
| Rated voltage | 12KV | 12KV |
| Power frequency withstand voltage | 42/48KV | 42/48KV |
| Lightning impulse withstand voltage | 75/85KV | 75/85KV |
| Rated current | 630A | 630A |
| Short-circuit and turn off the power supply | 63 | 53 |
| Short-circuit withstand current | 25 | 25 |
| Short circuit duration | 45 | 45 |
| Mechanical life | 10000 | 3000 |
| Gas pressure | 0.025(20℃) | |
| Annual leakage frequency | <0.05% | |
| Arc extinguishing mode | Vacuum arc extinguishing | |
| Class of protection | (IP67/Air tank) (3%/Enclosure) | |
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