FYFH-1.8BT Shuttle-Type Section Insulator (Type B, Inter-Phase) for 25kV OCS
TB/T 3036-2016 | Inter-phase sectioning | 27.5kV | Enhanced insulation
Specifications
| Model | FYFH-1.8BT |
|---|---|
| Standard | TB/T 3036-2016 Section Insulators for Electrified Railway OCS |
| Rated Voltage | 27.5kV rated (25kV AC 50Hz single-phase traction supply) |
| Design Speed | Up to 200 km/h (TB/T 3036-2016 upper limit) |
| Operating Temperature | -40°C to +70°C |
| Altitude | ≤ 4,000 m |
| Materials | High-strength aluminum alloy body; arc-resistant insulating elements (silicone rubber / porcelain); reinforced creepage |
| Installation | In-line series suspension on the contact wire; both ends mechanically connected to the contact wire |
The FYFH-1.8BT shuttle-type section insulator (Type B inter-phase variant) is designed and manufactured per TB/T 3036-2016 for inter-phase electrical sectioning on 25kV AC electrified railway overhead contact systems. Compared with the FYFH-1.8AT in-phase variant, the -BT version adds enhanced creepage distance and reinforced insulation geometry to handle inter-phase stress where adjacent OCS sections belong to different supply phases.
A high-strength aluminum alloy body carries the contact wire tensile load; arc-resistant insulating elements (silicone rubber or porcelain) with reinforced creepage provide inter-phase separation. Rated for 27.5kV systems, line speeds up to 200 km/h, -40°C to +70°C operating temperature and altitudes up to 4,000 m.
Typical applications include inter-phase sectioning points on mainline railways and at substation feeding boundaries. The unit is installed in-line with the contact wire as a horizontal series suspension with mechanical end connections.
Henan Chuangwit Railway Equipment provides datasheets, type test reports and project engineering support for the FYFH-1.8BT inter-phase variant.
Frequently Asked Questions
When is the FYFH-1.8BT used versus FYFH-1.8AT?
Use FYFH-1.8BT at inter-phase sectioning points where adjacent OCS sections belong to different supply phases; use FYFH-1.8AT for in-phase sectioning within a single supply zone.
What is the speed rating?
Up to 200 km/h per TB/T 3036-2016 upper limit, depending on sub-model and installation conditions.
Does it require special installation?
Installation is the same in-line series suspension as the -AT variant, but the inter-phase geometry requires verification of creepage distance per site-specific pollution severity.
Performance
Operating Conditions
Designed for continuous outdoor railway service from -40°C to +70°C at altitudes to 4,000 m, including humid and polluted atmospheres and inter-phase feeding boundaries.
Mechanical
Shuttle-type profile with controlled pantograph contact through the insulating zone; aluminum alloy body carries full contact wire tension; reinforced creepage geometry.
Electrical
Enhanced arc-resistant insulation with reinforced creepage provides inter-phase separation per TB/T 3036-2016 for 27.5kV systems, verified by type tests.
Applications
Inter-Phase Sectioning
Sectioning points where adjacent OCS sections belong to different supply phases.
Substation Feeding Boundaries
Boundaries between traction substation feeding zones.
Polluted & Coastal Areas
Reinforced creepage withstands high-pollution environments.
Cold Regions
Operation down to -40°C.