Ceramic LV bushings
Ceramic LV bushings
Ceramic LV bushings
Ceramic LV bushings – catalogue file
DownloadCeramic / porcelain material
| Ceramic group | Ceramic group | Ceramic group | Ceramic group | |||||
|---|---|---|---|---|---|---|---|---|
| Sub-Group | C-110 | C-120 | C-130 | C-221 | ||||
| Silicious Porcelain | Aluminous porcelain Standard strength | Aluminous porcelain High strength | Steatite low/loss angle |
|||||
| Properties | Properties | Properties | Symbols | Units | AL2O3 <30% | AL2O3 30-50% | AL2O3 >50% | |
| Apparent prosity (open) | max. | max. | Pa | Volume % | 0.0 | 0.0 | 0.0 | 0.0 |
| Bulk density | min. | min. | δa | g/cm3 | 2,2 | 2,3 | 2,5 | 2,7 |
| Flexural strength | min. | unglazed | Rf | N/mm2 | 50 | 90 | 140 | 140 |
| min. | glazed | Rf | N/mm2 | 60 | 110 | 160 | - | |
| Modulus of elasticity | min | E | GPa | 60 | 70 | 100 | 100 | |
| Mean coefficient linear expansion | α 20-100°C | 10-6K-1 | 3-6 | 3-6 | 4-7 | 6-8 | ||
| α 20-300°C | 10-6K-1 | 3-6 | 3-6 | 5-7 | 7-9 | |||
| α 20-600°C | 10-6K-1 | 4-7 | 5-7 | 5-7 | 8-9 | |||
| Specific heat capacity | 20°-100°C | cp | J/kgK | 750÷900 | 750÷900 | 750÷900 | 790÷920 | |
| Thermal conductivity | 20°-100°C | λ | W/mK | 1÷2,5 | 1,2÷2,6 | 1,5÷4,0 | 2,3÷2,8 | |
| Resistance to thermal shock | min. | Δt | K | 150 | 150 | 150 | 100 | |
| Electric strength | min. | Ed | kV/mm | 20 | 20 | 20 | 20 | |
| Withstand voltage | min. | U | kV | 30 | 30 | 30 | 30 | |
| Relative permittivity | 48÷62 Hz | εr | 6÷7 | 6÷7 | 6÷7,5 | 6 | ||
| Dissipational 20°C | max. | 48÷62 Hz | tanδ | 10-3 | 25 | 25 | 30 | 1,5 |
| max. | 1 kHz | tanδ | 10-3 | - | - | - | - | |
| max. | 1 MHz | tanδ | 10-3 | 12 | 12 | 15 | 1,2 | |
| Volume resistivity in terms of temperature | min. | 20°C | ρv | Ωcm | 1013 | 1013 | 1013 | 1012 |
| min. | 200°C | ρv | Ωcm | 108 | 108 | 108 | 1011 | |
| min. | 600°C | ρv | Ωcm | 104 | 104 | 104 | 107 | |
| Temperature corresponding to a volume resistivity | min. | 100 MΩcm | tK100 | °C | 200 | 200 | 200 | 500 |
| min. | 1 MΩcm | tK1 | °C | 350 | 350 | 350 | 800 |
Sulphur cement = excellent mechanical performances and max use temperature 90°C - Reduced assembly time
Portland cement = max use temperature 200°C - Drying time in mould is longer
Ceramic low voltage bushings
Ceramic low voltage bushings
Ceramic low voltage bushings
| Ref. | 1 | 2 | 3 | H1 | H2 | H3 | H4 | D1 | D2 | D3 | Weight |
|---|---|---|---|---|---|---|---|---|---|---|---|
| kV | kV | kV | mm | mm | mm | mm | mm | mm | mm | kg | |
| BAR363/3 | 3 | 1,2 | 7 | 45 | 10 | 9,5 | 7,5 | 12,5 | 6,5 | M3 | 0,010 |
| BAR363/4 | 3 | 1,2 | 7 | 45 | 10 | 9,5 | 7,5 | 12,5 | 6,5 | M4 | 0,012 |
| BAR364/5 | 3 | 1,5 | 7 | 80 | 15 | 15 | 10 | 20 | 11 | M5 | 0,033 |
| BAR364/6 | 3 | 1,5 | 7 | 90 | 15 | 15 | 10 | 20 | 11 | M6 | 0,045 |
| BAR351 | 1,5 | 1,5 | 3,5 | 100 | 38 | 8 | 7 | 30 | 16 | M8 | 0,12 |
| BAR352 | 4 | 1,5 | 12 | 150 | 46 | 12 | 16 | 39 | 25 | M12 | 0,32 |
2 - Nominal Voltage (Un) - 20 MHz
3 - Rated Power Frequency Withstand Voltage, dry (50 Hz, 1 min)
H - Height insulating part
H2 - Usable Height support
H3 - Height with 1 male rod