12-40.5kV High Voltage Indoor Earthing Switch

What is an earthing switch?

An earthing switch is an electrical device used in switch cabinets. Its main function is to connect electrical equipment to the ground to ensure the safe operation of electrical equipment. It can carry current for a certain period of time under abnormal conditions (e.g. short-circuit current), but is not required to carry current under normal circuit conditions. It is suitable for 12KV- 40.5KV and below, AC 50Hz power system, and can be used with various types of high-voltage switchgear for grounding protection.

Main structure of earthing switch: bracket, grounding knife assembly, fixed contact, sensor, shaft, arm, compression spring, conductive sleeve, soft connection. The bracket is bent by a thin steel plate and welded into parts, and the rest are assembled parts.

Earth switch working principle

1. When the operating mechanism is used to close the earthing switch, the torque acts as a torque to overcome the resistance torque, and the rotating arm rotates in the closing direction, and the operating lever on the grounding knife passes the compression spring to release the point, and the compression spring releases the energy. Make the earthing switch close quickly, in the closing position. The grounding knife on the grounding knife assembly is firmly and reliably contacted by the flange portion of the disc spring and the stationary contact.
2. During the opening operation, the acting torque causes the main shaft to overcome the main torque and the spring force, and drives the arm to rotate in the opening direction, and the grounding knife compression spring passes the dead point, and the compression spring energy storage ends, so as to prepare for the next closing.
3. The earthing switch and closing speed are independent of the operating speed of the person.

(Motorised earth switches)

Normal Working Environment

1. Altitude: ≤1000m
2. Ambient temperature at -10℃ to +40℃
3. Earthquake intensity: ≤8 degree
4. Pollution level: II
5. Relative humidity: Daily average≤95%, monthly average≤90%

The advantages of earthing switches mainly include the following aspects: First, earthing switches can effectively protect electrical equipment and avoid personal injury and property losses caused by leakage of electrical equipment; secondly, earthing switches can improve the reliability and stability of electrical equipment. safety, reducing equipment failure rates and maintenance costs; finally, earthing switches can improve the safety performance of electrical equipment and ensure the normal operation of electrical equipment in various harsh environments.

When using an earthing switch, you need to pay attention to the following points: First, the earthing switch should be selected and installed according to the specified electrical specifications to ensure its normal operation; secondly, the earthing switch should be inspected and maintained regularly to ensure its reliability and Stability; Finally, when using the earthing switch, you should pay attention to safe operation to avoid personal injury and property damage caused by improper operation.

(Application of earthing switch in switch cabinet)

In short, the earthing switch is a very important electrical equipment. Its role is not only to protect electrical equipment, but also to improve the reliability and safety performance of electrical equipment. When using an earthing switch, you need to pay attention to its electrical specifications and installation requirements, conduct regular inspection and maintenance, and pay attention to safe operation.

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