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Based on GIS technology,It integrates all necessary functions indispensable for a switch cell such as circuit breakers,disconnecting switches and earthing switches in a metal - enclosed enclosure (cast aluminum) filled with SF6 gas as a module,and is mounted with two or three bushings according to the wiring requiremen of a substation.Through connection of insulation bushing with substation bus and incoming and outgoing wires,HGIS is of packaged structure with each phase as independent support.Three-phase HGIS module is like a complete high voltage compartment with all live electrical equipment except the bus in enclosed assembly.HGIS equipment features simple structure,compactness,high dependability,easy installation and maintenance,which provides new options forthe construction,renovation and extension of a substation.It is a suitable for power system of three-phase,AC 50Hz and rated voltage of 126kV.
Technical datas:
| Item | Unit | Data | |
| Rated voltage | kV | 126 | |
| Rated current/Rated current of main busbar | A | 2500/3150 | |
| Rated frequency | Hz | 50 | |
| Rated short-time withstand current,3s | kA/s | 40/3 | |
| Rated peak withstand current | kA | 100 | |
| Rated insulation level | Rated power frequecy withstand voltage for 1m (to earth/between poles) | kV | 230 |
| Rated power frequency withstand voltage for 1m (breakers) | kV | 230+73 | |
| Rated lighting impulse withstand voltage (to earth/between poles) | kV | 550 | |
| Rated lighting impulse withstand voltage(breakers) | kV | 550+103 | |
| Radio influence level (at 1.1 times rated pole voltage) | µV | ≤500 | |
| Prtial discharge(full gap) | pC | <5 | |
| Rated SF6 pressure (20°c) | Rated voltage(Breaker) | 0.6 | 0.6 |
| Alarm pressure (Breaker) | 0.55 | 0.55 | |
| Blocking pressure (Breaker) | 0.5 | 0.5 | |
| Rated voltage (Other gas room) | 0.4 | 0.5 | |
| Alarm pressure (Other gas room) | 0.3/0.35(PT) | 0.4 | |
| SF6 annual leakage rate | % | ≤0.5 | |
HGIS 126kV Circuit Breaker