Use epoxy resin insulators, conductive parts made of silver-plated electrolytic copper(99.9%).
The blades are directly connected to the drive shaft. Contact elements are overdimensioned according to the requirements in order to guarantee, together with a high contact pressure between blades and contacts, a reduced ohmic resistance at the contact surface and a minimum metal wear-off during the life of the grounding switch, with the necessary robustness to withstand thermal and mechanical stresses under short-circuit conditions.
Normal usage conditions:
1. The altitude does not exceed 1000m;
2. Ambient air temperature: upper limit +40℃, lower limit -25℃;
3. The earthquake intensity does not exceed 8 degrees;
4. Installed in places without risk of fire, explosion, severe dust, chemical corrosion and severe vibration.
| Item | Unit | Data | ||
| Rated voltage | kV | 35 | ||
| Maximum voltage | kV | 40.5 | ||
| Rated short-time withstand current | kA | 31.5 | ||
| Rated short-circuit duration | s | 4 | ||
| Rated short-circuit making current | kA | 80 | ||
| Rated peak withstand current | kA | 80 | ||
| Phases center distance | mm | 280, 300, 350, 400 | ||
| Rated insulation level | PF withstand voltage(1 min) | kV | Phase to earth | 95 |
| Lightning impulse withstand voltage | Phase to phase | 185 | ||
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