Modular design to meet the different needs of users
Miniaturized design with high technical performance
Adapting to various forms of operating mechanisms
maintenance free operation
Short on-site installation cycle and high operational reliability
Main electrical parameters of 252kV GIS:
Project | Parameter | |
Rated voltage | 252 kV | |
Rated insulation level | 1min power frequency withstand voltage (break/ground) | （460+145）kV/460kV |
Lightning impulse withstand voltage (break/ground) | （1050+200）kV/1050 kV | |
Rated frequency | 50 Hz | |
Rated current | 3150、4000 A | |
Rated short-circuit breaking current | 50 kA | |
Rated peak withstand current | 125 kA | |
Short time withstand current (effective value) | 50 kA/3s | |
SF6 gas leakage rate | <0.3%/year | |
SF6 gas humidity | Electrolytic decomposition products (handover acceptance value/long-term operation allowable value) | ≤150/300uL/L |
No electrolytic decomposition products (handover acceptance value/long-term operation allowable value) | ≤250/500uL/L | |
Partial discharge | Each interval/individual insulation component | ≤5/3Pc |
Structural layout | Circuit breaker | Three phase distribution box |
Main busbar | Three phase common box | |
Circuit breaker operating mechanism | Hydraulic and spring mechanism | |
Circuit breaker operation mode | Split phase operation, three-phase mechanical linkage | |
Spacing size | 1.8-2.2m | |
