Overview
FKN12-12 compressed air load switch, FKRN12-12 series compressed air load switch – fuse combination device, suitable for controlling and protecting power equipment such as transformers, cables, overhead lines, etc. in three-phase distribution systems of 12kV and below.
Especially suitable for terminal substations and box type substations in urban and rural power grids. And it is applicable to the control and protection of ring networks and dual radiation power supply units
Operating Conditions
1. Altitude: ≤ 1000 meters
2. The environment temperature: upper limit +40℃, lower limit -25℃
3. Relative humidity: daily average value is not greater than 95%, monthly average is not greater than 90%;
4. There is no fire, explosion hazard, serious pollution, Places subject to chemical corrosion and severe vibration.
5. Pollution level: II
Model and meaning
Technical Data
| Item | Unit | Parameter | |||
| FKN12A-12D | FKRN12A-12D | ||||
| Rated voltage | kV | 12 | |||
| Rated frequency | Hz | 50 | |||
| Rated current | A | 630 | 125 | ||
| Rated insulation level | 1min power frequency withstand voltage | To ground,alternatc | kV | 42 | |
| lsolation fracture | 48 | ||||
| Lightning impulse withstand voltage(peak value) | To ground,alternatc | 75 | |||
| lsolation fracture | 85 | ||||
| Rated short time withstand current | Load switch | kA | 20 | / | |
| Earthing switch | 20 | ||||
| Rated shortcircuit duration | Load switch | s | 4 | / | |
| Earthing switch | 2 | ||||
| Rated short circuit making current(peak value) | kA | 50 | / | ||
| Rated breaking current | Rated active load Breaking current | A | 630 | / | |
| Closed loop breaking current | 630 | / | |||
| 5% active load Breaking current | 31.5 | / | |||
| Cable charging breaking current | 10 | / | |||
| Switching off no-load transformer Compressor capacity | kVA | 1250 | |||
| Rated short circuit breaking current(current limiting fuse) | kA | / | 31.5 | ||
| Rated transfer current | A | / | 1200 | ||
| Impactor output energy | J | / | 1±0.5 | ||
| Mechanical life | Times | 2000 | |||
| Item | Unit | Parameter |
| Fracture opening distance | mm | ≥175 |
| Center distance between phases | 210±2 | |
| Air gap between phases | ≥125 | |
| Trip | 210±4 | |
| Overtravel | ≥40 | |
| Three phase closing in different periods | ms | ≤10 |
| Three phase opening in different periods | ≤5 | |
| Inherent opening time of shunt release | 40~ 65 | |
| Main circuit resistance | μΩ | ≤130 |
Overall and mounting dimensions(mm)
