FYFH-1.8BT Inter-Phase Section Insulator (25kV)
Shuttle-type Type B inter-phase section insulator per TB/T 3036-2016 for 25kV AC railway OCS, up to 200 km/h.
This image shows a representative model of the series; the actual product may vary in appearance.
Specifications
| Model | FYFH-1.8BT |
|---|---|
| Drawing No. | CWLFD1.8BT-00 |
| 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 (designed to TB/T 3036-2016) |
| 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
What is the difference between the BT type and the in-phase (AT) type?
Compared with the FYFH-1.8AT in-phase type, this model is the BT version with reinforced creepage distance and optimized insulation geometry, intended for phase separation (out-of-phase) electrical sectioning scenarios.
What are the typical installation locations?
Suitable for phase-separation electrical sectioning on speed-raised lines up to 200 km/h and conventional trunk lines, including traction substation exits, section post junctions and inter-station phase-break sections.
What are the key insulation parameters?
Air insulation clearance ≥300 mm with reinforced creepage distance design; rated voltage 27.5 kV for 25kV power-frequency single-phase AC traction power supply systems.
What design considerations support inspection and maintenance?
Clear visible interruption gaps at both ends facilitate maintenance and inspection; manufactured to TB/T 3036-2016 and delivered after passing factory inspection unit by unit (batch by batch).
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 Performance
Shuttle-type profile with controlled pantograph contact through the insulating zone; aluminum alloy body carries full contact wire tension; reinforced creepage geometry.
Electrical Performance
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.
