72.5kV, suitable for three-phase AC 50/60Hz high-voltage transmission system.
Insulation performance: lightning impulse withstand voltage 185kV (to ground), power frequency withstand voltage 100kV (to ground), higher fracture withstand voltage value, ensuring electrical isolation reliability after disconnection.
The 72.5kV GW4 isolation switch, with its high insulation strength, modular design, and ability to adapt to harsh environments, has become a key equipment for safe operation and maintenance of high-voltage power systems. The selection should be based on current requirements, operating methods, and pollution levels (recommended for environments of level II or below).
| 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 |
Used for line isolation, equipment maintenance, or changing the operation mode of the power grid under no-load conditions, it cannot disconnect load/short-circuit current and needs to be used in conjunction with circuit breakers.
Optional single-sided or double-sided grounding knife switch, synchronously isolating the main circuit and grounding circuit
Substation and power plant: isolate equipment such as generators and transformers, and use circuit breakers to switch the operation mode of the power grid.
Power distribution in industrial and mining enterprises: isolation and equipment protection of high current power sources in high energy consuming scenarios such as metallurgy and chemical industry.
Transmission line segmentation: 72.5kV high-voltage lines are segmented for maintenance or fault isolation, forming visible breakpoints.
