Used for line isolation, equipment maintenance, or power grid operation mode switching under no-load conditions, it cannot disconnect loads or short-circuit currents and needs to be used in conjunction with circuit breakers.
Can be configured with single-sided or double-sided grounding knife switches (such as GW4-126D/DW type) to achieve linkage isolation between the main circuit and grounding
The 126kV GW4 isolation switch, with its modular design, high reliability, and ability to adapt to complex environments, has become the core equipment for safe operation and maintenance of high-voltage power grids. Selection should focus on current capacity, grounding configuration, and pollution level matching.
| 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 |
High voltage transmission lines: 126kV substation busbar segmentation, transformer neutral point isolation, and line no-load switching.
Equipment maintenance isolation: When cooperating with circuit breaker power-off maintenance, visible electrical breakpoints are formed.
Industrial power system: power isolation and protection of high-voltage distribution systems in large industrial and mining enterprises.
