JN22-40.5/31.5 Indoor High Voltage Earthing Switch

The JN22-40.5/31.5 indoor high voltage grounding switch is an advanced high-voltage grounding device independently developed and optimized by professional high-voltage electrical research institutions. Designed for 40.5kV, 50Hz AC power systems, the product fully complies with the national standard GB1985 for AC high-voltage isolating switches and grounding switches.

It is specially configured to match KYN□-40.5 series and other mainstream 40.5kV indoor high-voltage switchgear, providing reliable grounding locking and safety isolation for high-voltage electrical equipment during maintenance and overhaul. With stable mechanical performance, excellent dynamic and thermal stability, and standardized manufacturing precision, the JN22-40.5/31.5 ensures safe, grounded circuit protection and effectively eliminates residual voltage risks, becoming an essential safety component for medium and high-voltage power distribution systems.

• Ambient air temperature: upper limit +40℃, lower limit -25 ℃;
• Altitude: 1000m and below;
• Relative humidity: monthly average is not more than 90%,
• The daily average is not more than 95%;
• The surrounding air should not be corroded or flammable gas and water vapor body obvious pollution;
• No regular strenuous exercise
• Pollution resistance grade: Ⅱ.
• If the conditions of use exceed the above provisions, the user and the manufacturer shall negotiate to determine.

The JN22-40.5/31.5 high voltage grounding switch is widely applied in 35kV–40.5kV level medium and high-voltage power distribution projects, serving as core safety grounding equipment for power system maintenance and fault protection.

It is commonly used in urban grid substations, industrial enterprise central power stations, mining power distribution rooms, large commercial power distribution centers, and new energy power plant booster stations. Matched with 40.5kV indoor metal-clad switchgear, it provides reliable grounding protection for power outage maintenance, effectively preventing accidental power transmission and residual voltage hazards. Suitable for conventional power grid renovation, industrial power upgrading, and large-scale infrastructure power supply projects, it guarantees standardized and safe operation of high-voltage power systems.

Before installation, confirm that the model, rated voltage and short-circuit withstand current parameters match the supporting 40.5kV switchgear and system requirements. Verify the installation size and reserved mounting position inside the cabinet to ensure accurate assembly.

Fix the grounding switch firmly on the cabinet mounting bracket with standard fasteners, ensuring stable installation without shaking or displacement. Assemble and adjust the mechanical operating linkage to guarantee flexible opening and closing actions with no jamming or dead points.

Complete reliable main grounding connection to the cabinet grounding busbar to ensure low-resistance grounding performance. After installation, perform multiple manual operation tests to check contact closure accuracy and mechanical linkage consistency. Finally, conduct overall insulation inspection and mechanical debugging before official put-into-service.

JN22-40.5/31.5 vs Conventional 40.5kV Grounding Switch

1. Standard Compliance    JN22-40.5/31.5 is developed based on professional high-voltage institute technology and fully meets GB1985 official standards, with stricter type-test indicators. Ordinary grounding switches usually adopt simplified standards with weaker stability margin.

2. Matching Adaptability     This model is specially optimized for KYN-40.5 series switchgear with perfect cabinet matching size and linkage precision. General grounding switches have universal size but poor mechanical coordination with mainstream 40.5kV cabinets.

3. Safety & Stability          JN22-40.5/31.5 features stronger dynamic and thermal stability, 31.5kA high short-circuit withstand capability, suitable for heavy-load and high-standard power grid projects. Ordinary models are only applicable for conventional light-load distribution scenarios.

4. Mechanical Reliability     Optimized mechanical structure ensures flexible operation, precise closing stroke and long mechanical life. Traditional grounding switches are prone to jamming and loose linkage after long-term operation.

5. Application Grade       JN22-40.5/31.5 is suitable for substations, industrial heavy-duty power distribution and key infrastructure projects, while ordinary grounding switches are only suitable for ordinary general distribution projects.

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