FYFH-1.8BT-E Enhanced Section Insulator (25kV)
Enhanced-insulation inter-phase section insulator per TB/T 3036-2016 for severe-service 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-E |
|---|---|
| Drawing No. | CWLFD1.8BT-E-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 (designed for 2000-4000m high-altitude service) |
| Materials | High-strength aluminum alloy body; arc-resistant insulating elements; reinforced creepage; enlarged air gap geometry |
| Installation | In-line series suspension on the contact wire; both ends mechanically connected to the contact wire |
The FYFH-1.8BT-E combines the inter-phase capability of the FYFH-1.8BT with the enhanced insulation geometry of the -E variant. It is designed and manufactured per TB/T 3036-2016 for inter-phase electrical sectioning of 25kV AC electrified railway overhead contact systems in severe-service environments.
The air insulation gap is enlarged to ≥430mm and creepage distance is reinforced for high-altitude lines (2000-4000m), coastal and salt-fog regions, and heavy-pollution industrial corridors — sites where both inter-phase stress and severe pollution must be managed simultaneously.
A high-strength aluminum alloy body carries the contact wire tensile load; arc-resistant insulating elements with reinforced creepage deliver inter-phase separation. Rated for 27.5kV systems, line speeds up to 200 km/h, -40°C to +70°C and altitudes up to 4,000 m.
Henan Chuangwit Railway Equipment provides datasheets, type test reports and project engineering support for the FYFH-1.8BT-E enhanced inter-phase variant.
Frequently Asked Questions
Which line scenarios is this model intended for?
Suitable for phase separation (out-of-phase) electrical sectioning on lines up to 200 km/h, especially severe service environments such as high altitude, heavy pollution, coastal areas and tunnels.
What does the enhanced insulation design comprise?
On the reinforced phase-separation structure, the air gap is enlarged to ≥430 mm and the creepage distance reinforced, forming dual insulation redundancy against phase voltage difference combined with heavy pollution.
What is the maximum permissible passing speed?
Maximum permissible passing speed ≤200 km/h, for phase-break sections on speed-raised and conventional trunk lines.
Which parameters matter when selecting for high-altitude phase-break sections?
Altitude ≤4000 m, applicable to phase-break sections at 2000-4000 m; operating temperature -40°C to +70°C; selection should be verified against severe service conditions.
Performance
Operating Conditions
Designed for severe-service outdoor railway environments combining inter-phase stress with high altitude, coastal/salt-fog, or heavy-pollution conditions.
Mechanical Performance
Aluminum alloy body carries full contact wire tension; reinforced insulation geometry supports enlarged air gap without increasing installation envelope excessively.
Electrical Performance
Enhanced arc-resistant insulation with air gap ≥430mm and extended creepage provides inter-phase separation per TB/T 3036-2016 for 27.5kV systems in severe-service inter-phase applications.
Applications
Inter-Phase + Severe Service
Inter-phase sectioning in high-altitude or heavy-pollution zones.
High-Altitude Boundaries
Substation feeding boundaries on plateau lines.
Coastal & Salt-Fog
Inter-phase sectioning on coastal corridors with salt pollution.
Cold Regions
Operation down to -40°C.
