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.
JN22B-40.5 indoor AC high-voltage grounding switch is an improved product of the JN22 type grounding switch, and its performance has reached the domestic advanced level. The main electrical performance complies with the requirements of GB/T 1985 “AC High Voltage Isolating Switch and Grounding Switch” and IEC129. It is suitable for power systems with AC 50Hz of 40.5kV and below. It can be used with various types of high-voltage switchgear and can also be used as a high-voltage switch. Used for grounding protection during maintenance of electrical equipment. This type of switch can be used in conjunction with live display devices.
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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