Model：VITD24/1250-25
Category：VI for 24KV embedded poles
| Main Technical Parameter | ||
| Rated voltage | 24kV | |
| Rated current | 1250A | |
| Rated frequency | 50Hz | |
| Rated short-time Power frequency withstand voltage | 79kV | |
| Rated lightning impulse withstand voltage | 145kV | |
| Rated short-circuit breaking current | 25kA | |
| Rated short-circuit making current(peak) | 63kA | |
| Breaking operations of rated short circuit breaking current | 30 times | |
| Rated breaking current of single capacitor bank | 400A | |
| Rated short-time withstand current | 25kA | |
| Rated peak withstand current | 63kA | |
| Rated duration of short-circuit | 4 s | |
| Mechanical endurance | 10000 times | |
| Closing force due to bellow and atmosphere | 120±50N | |
| Force required to hold contacts open at full storke | 190±60N | |
| Circuit resistance at lowest rated contact force | ≤20μΩ | |
| Storage life | 20 years | |
| Contacts limit erosion | 3mm | |
| Weight of movable parts | ≤1.2kg | |
| MECHANICAL DATA REQUIRED FOR THE MATCHED VACUUM SWITCHGEAR | ||
| Clearance between open contacts | 13±1 mm | |
| Contact connection stroke | 3.5±0.5mm | |
| Average opening speed(average of 75% contact gap) | 1.5±0.2m/s | |
| Average closing speed(average of last 30% contact gap) | 0.8±0.2m/s | |
| Rated added extemal contact final force | 2500±200N | |
| Contact bouncing duration at closing operation | ≤2 ms | |
| Closing and opening non-simultaneity of three-phase contacts | ≤1 ms | |
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