Product Overview
The JN22B-40.5/31.5 indoor HV earthing switch complies with national standard GB1985-2004 and IEC 62271-102:2002; it is used in three-phase 50 Hz power systems with a rated voltage of 40.5 kV and can be combined with KYN61-40.5 and other high-voltage switchgear cubicles for earthing protection during maintenance of high-voltage equipment. It is an improved version of the original earthing switch, with a simple, compact structure, consistent performance and easy small-angle operation, and can use the connecting and transmission parts of the JN15-12.
Type Designation
JN22(B)-40.5/31.5-□: JN - indoor earthing switch; 22 - design serial number; (B) - improved type; 40.5/31.5 - maximum voltage (kV) / 4 s thermal short-time current (kA); □ - phase spacing (mm).
Main Technical Parameters
| No. | Item | Unit | Data |
|---|---|---|---|
| 01 | Rated voltage | kV | 40.5 |
| 02 | Rated short-time withstand current (4 s) | kA | 31.5 |
| 03 | Rated short-circuit closing current (peak) | kA | 80 |
| 04 | Rated peak withstand current | kA | 80 |
| 05 | Phase spacing | mm | 300、350、400 |
| 06 | Rated insulation level (1-min power-frequency withstand, to earth and between phases) | kV | 95 |
| - | Rated insulation level (lightning impulse voltage, to earth and between phases) | kV | 185 |
Outline & Installation Dimensions
Figure: outline and installation dimensions of JN22(B)-40.5/31.5
Service Conditions
- Altitude not exceeding 1000 m;
- Ambient air temperature: maximum +40℃, minimum -25℃;
- Seismic intensity not exceeding 8 degrees;
- Installed in locations without fire or explosion hazards, severe dust, chemical corrosion or violent vibration.
Related Products
Earthing switches of the same series and other types available:
- JN2-40.5/25 indoor HV earthing switch
- JN15-12/31.5 indoor HV earthing switch
- JN22-40.5/31.5 indoor HV earthing switch
Other high-voltage switchgear:
