The 11kv earth switch JN15-12/31.5 is a specific model of high-voltage grounding switch designed for indoor installation in 12kV-rated electrical systems. Its primary function is to provide a safe, reliable, and visible earth (ground) connection to isolated high-voltage circuits or equipment. This ensures personnel safety during maintenance by discharging residual energy and preventing accidental re-energization.
The indoor high-voltage grounding switch consists of a bracket, grounding knife assembly, static contact, sensor, shaft, crank arm, compression spring, conductive sleeve, and flexible connector. Note: The bracket is constructed from thin steel sheets bent and welded together; the remaining components are assembled. It is commonly used as an integral safety component within metal-enclosed switchgear (like KYN28A-12) for 10kV distribution networks.
Key Specifications
JN15-12/31.5
- JN15: Model designation (J = Grounding Switch, N = Indoor)
- 12: Rated voltage of 12 kilovolts (kV).
- 31.5: Rated short-time withstand current (short-circuit current) of 31.5 kiloamperes (kA) for a specified duration (typically 2-4 seconds).
Indoor high-voltage earthing switches have a wide range of applications. Please specify the product model and specifications, the installation position of the operating crank arm (left or right), and whether to configure a live display device. If the user has special requirements, please consult with the manufacturer in advance when ordering.
Technical Parameters
| No. | Item | Data | |
| 1 | Rated Current | 24kA | |
| 2 | Rated short-time withstand current | 31.5kA | |
| 3 | Rated short-time making current | 80kA | |
| 4 | Rated peak withstand current | 80kA | |
| 5 | Rated short-circuit duration | 4s | |
| 6 | Rated insulation level | 1min power frequency withstand voltage | 65kV |
| Lightning impulse voltage | 125kV | ||
| 7 | Mechanical life | 2000times | |
Working Principle
- When the earthing switch is closed, the applied torque causes the main shaft to overcome the resistive torque, driving the crank arm to rotate in the closing direction. This causes the operating lever on the earthing switch to pass the dead point of the compression spring, releasing its energy and rapidly closing the earthing switch to the closed position. The earthing switch assembly maintains firm contact with the flange (blade) of the stationary contact via a disc spring.
- When opening the earthing switch, the applied torque causes the main shaft to overcome the main torque and spring force, driving the crank arm to rotate in the opening direction. This causes the compression spring of the earthing switch to pass the dead point, releasing its energy and preparing for the next closing. The earthing switch and its closing speed are independent of the operator's speed.
Environmental Condition
- Altitude not exceeding 1000 meters;
- Ambient temperature not exceeding 40°C and not falling below -10°C;
- Daily average relative humidity not exceeding 95°C and monthly average not exceeding 90°C;
- Earthquake intensity not exceeding magnitude 8.
- The installation site must not be exposed to gases, vapors, chemical precipitation, smoke, dust, dirt, or explosive or corrosive substances that could seriously affect the insulation and conductivity of the grounding switch;
- The installation site must not be subject to frequent and severe vibrations.
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Packing
Carton
Wooden Case
Pallet
FAQ
Q: Could you send me dimension drawings?
A: Sure, please leave message to us, we'll reply to you within 24 hours.
Q: Why is it used?
A: To safely discharge trapped electrical energy and prevent accidental re-energization, reducing electrocution risks.
Q: Where is it typically installed?
A: Inside metal-enclosed switchgear (like KYN series) for indoor substations or power distribution systems.
Q: How is it operated?
A: Usually manually via a handle on the switchgear panel; some support motorized remote control.
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