Metal Oxide Surge Arresters
SBKT Series in Tube Design for applications up to 800 kV
Surge arrester housed in polymer housing developed for the protection of outdoor high voltage equipment, HVDC, SC and SVC applications against atmospheric or system immanent overvoltage.
Our arresters with silicone housing in tube design of the SBKT series are available for applications up to 800 kV.
Similar to porcelain housed arresters, Tridelta uses a hollow insulator as housing for the arresters. The composite insulator is made of a Fibreglass Reinforced Plastic tube (FRP), with silicone rubber sheds directly molded onto it. Composite insulators do have a very high mechanical stability.
As for all our arresters with silicone housing, Tridelta uses high-quality LSR silicone which keeps its hydrophobic and UV-resistant/non ageing properties over the complete service life and ensures excellent artificial pollution performance. An outstanding sealing system prevents from any moisture ingress and assures a long service life.
Our arresters with silicone housing in tube design of the SBKT series are available for applications up to 800 kV.
Similar to porcelain housed arresters, Tridelta uses a hollow insulator as housing for the arresters. The composite insulator is made of a Fibreglass Reinforced Plastic tube (FRP), with silicone rubber sheds directly molded onto it. Composite insulators do have a very high mechanical stability.
As for all our arresters with silicone housing, Tridelta uses high-quality LSR silicone which keeps its hydrophobic and UV-resistant/non ageing properties over the complete service life and ensures excellent artificial pollution performance. An outstanding sealing system prevents from any moisture ingress and assures a long service life.
Field of application
Protection of transformers, switch-gears and plants against atmospheric and switching overvoltages
Selection of metal oxide (Zn0) surge arresters
The selection of the rated and the continuous operating voltage of the arresters is depending on the neutral point treatment of the network. Guidelines for selection: see VDE 0675- 5 and IEC 60099-5
Arrester properties
Glass fibre reinforced resin (GFRR) tube with silicone rubber sheds
Absolutely unbreakable pressure relief characteristics
Very high bending strength
Design
Type tested according to IEC 60099-4
Colour: grey RAL 7040
Fittings: Al alloy
Connections: clamps, screws, nuts stainless steel (aluminum and other materials on request)
Optional accessories
Monitoring spark gap, surge counter, diagnostic appliance
| Product | SBKT size I | SBKT size II | |
|---|---|---|---|
| High System Voltage Us | kV | 550 | 800 |
| Max. Rated Voltage Ur | kV | 444 | 624 |
| max. Nominal Discharge Current ln (at 8/20μs) waveshape | kA | 20 | 20 |
| max. Thermal Energy Absorption Capability | kJ per kV of Ur | 10 | 18 |
| max. Line Discharge Class | 4 | 5 | |
| Arrester Classification | SM,SH | SM,SH | |
| Qrs (accor. IEC 60099-4 Edt. 3.0) | 3.6 | 4.4 | |
| High Current Withstand Strength 4/10 μs | kA | 100 | 100 |
| Max. Low Current Withstand Strength 2ms | A | 1700 | 2600 |
| Max. Short Circuit / Pressure Relief Capability | kA – 0.2s | 65 | 80 |
| Mechanical Strength: Specific short-term load SSL | Nm | 12,000 | 23,000 |
Related Products
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