27.5kV isolation switch in the GW4 series is designed specifically for railway contact networks and specific high-voltage scenarios
Conductive circuit: Copper tube soft connection reduces mechanical stress, and contact finger spring pressure optimization ensures contact stability.
Insulation configuration: Anti fouling ceramic insulator with a creepage distance of ≥ 31mm/kV (designed for Class III pollution), suitable for complex environments such as humidity and salt spray
The 27.5kV isolation switch is adapted to railway and industrial scenarios through customized design (such as anti fouling and high current specifications). When selecting, special attention should be paid to the rated current, operating mechanism type, and environmental adaptability.
| Rated voltage | 15kV |
| Rated lightning impulse voltage (peak value) | To earth:95kV Across the isolating:105kV |
| 1 min rated power frequency voltage(virtual value) | To earth:45KV Across the isolating:50kV |
| Insulator creepage distance ratio | ≥3.1cm/kV(IV Level pollution area) |
| Rated current | 630/1250/1600/2000/2500/3150A |
| (4S)Rated short circuit current | 20kA/31.5kA/40kA |
| Rated current peak tolerance | 40kA |
| Across the isolating distance | 170mm |
| Phase to phase distance | 450mm |
Railway overhead contact system: The line segmentation and equipment maintenance isolation of electrified railway power supply system, such as the switching of dead zone in the overhead contact system.
Substation isolation: Used in conjunction with circuit breakers in 27.5kV distribution lines to form visible disconnection points.
Industrial power distribution: power isolation and equipment protection for high current scenarios such as metallurgy and mining.
