JN15-12/31.5 Indoor High-Voltage Earthing Switch, 10KV Ring Main Unit Earthing Protection Disconnector Switch

The JN15 indoor high-voltage earthing switch is a high-voltage electrical equipment suitable for indoor 3~12kV three-phase AC 50Hz power systems. It is mainly used in conjunction with various types of high-voltage switchgears, and can also be used for earthing protection during the maintenance of high-voltage equipment. Its working environment requires an altitude of no more than 1000 meters, an ambient temperature of -10℃ to +40℃, and an earthquake intensity of ≤8 degrees. It is suitable for places without fire, explosion hazards, severe dust, chemical corrosion and severe vibration. This earthing switch is composed of components such as a bracket, an earthing knife assembly, a static contact, and a sensor. The bracket is formed by welding thin steel plates. Its working principle is to drive the main shaft to rotate through the operating mechanism, and use the compression spring energy storage to realize fast switching-on and switching-off actions. When closing, the earthing knife contacts the static contact through a disc spring. This product focuses on reducing volume and weight in structural design, and the switching speed is not affected by manual operation speed.

The product model of JN15 indoor high-voltage earthing switch is JN15, which is suitable for indoor 3-12kV three-phase AC 50Hz power systems. It has a certain closing capacity to protect other electrical equipment in the switchgear from damage. It can be used in conjunction with various high-voltage switchgears and serves as earthing protection during the maintenance of high-voltage electrical equipment. The applicable environmental conditions include an ambient air temperature upper limit of +40℃, a lower limit of -10℃, an altitude of no more than 1000 meters, an earthquake intensity of no more than 8 degrees, and places without fire, explosion hazards, severe dust, chemical corrosion and severe vibration.

The working principle of the JN15 indoor high-voltage earthing switch is to drive the main shaft to rotate through the operating mechanism, and use the compression spring energy storage to realize fast switching-on and switching-off actions. When closing, the earthing knife reliably contacts the static contact through a disc spring. I. Environmental Conditions 1. Applicable to the following environmental conditions: a. Altitude no more than 1000 meters. b. Ambient temperature not higher than +40℃ and not lower than -10℃. c. Relative humidity: daily average no more than 95%, monthly average no more than 90%. d. Earthquake intensity no more than 8 degrees. 2. Not applicable to the following places: a. Installation places with gases, vapors, chemical precipitates, smoke, dust and dirt, as well as explosive and corrosive substances that seriously affect the insulation and conductive capacity of the earthing switch. b. Installation places with frequent and severe vibrations. II. Structure and Working Principle 1. Main Structure: The earthing switch consists of a bracket, an earthing knife assembly, a static contact, a sensor, a shaft, a crank arm, a compression spring, a conductive sleeve, and a flexible connection. Note: The bracket is formed by bending thin steel plates and then welding into components; the rest are all assembled parts. 2. Working Principle: a. When the operating mechanism is used to close the earthing switch, the torque causes the main shaft to overcome the resistance torque, driving the crank arm to rotate in the closing direction, and the operating rod on the earthing knife passes through the dead point of the compression spring. The compression spring releases energy, enabling the earthing switch to close quickly and stay in the closed position. The earthing knife on the earthing knife component firmly and reliably contacts the flange of the static contact through a disc spring. b. During the opening operation, the applied torque causes the main shaft to overcome the main torque and the spring force, driving the crank arm to rotate in the opening direction, and the earthing knife compression spring passes through the dead point, ending the compression spring energy storage for the next closing. c. The closing speed of the earthing switch is independent of the human operation speed.