Composition and structure of grounding device?

Answer 1

Composition of grounding device

The grounding device consists of a grounding body and a grounding wire. The metal conductor that is buried in the ground and directly in contact with the ground is called the grounding body, and the metal conductor that connects the necessary grounding part of the electrical device with the grounding body is called the grounding wire. for the grounding grid.

The grounding body is a metal body buried in the soil, such as steel pipe, angle steel, flat steel, etc., with a length of about 2.5 meters. The grounding body can be buried horizontally or vertically. When burying horizontally, flat steel is generally used to make the grounding body, and the burial depth should not be less than 0.6 meters. When buried vertically, steel pipes and angle steels with a wall thickness of about 3.5 mm or more are generally used.

Weld the flat steel on the grounding body as the lead-out conductor, and weld the bolt on the lead-out conductor to connect with the grounding wire. The ground wire generally adopts insulated copper wire and bare copper wire. The minimum cross-sectional area of the ground wire is 1.5 mm2 for insulated copper wire and 4 mm2 for bare copper wire. The above is the composition of the grounding device.

grounding device.

Grounding device structure

The grounding device can provide simple, effective, and economical protection for the bearing to prevent bearing damage caused by working current or system fault current and lightning current passing through the bearing. Its working principle is: that the grounding wire transmits the current on the car body directly to the axle through the grounding device, and then forms a grounding loop through the wheel and the rail.

At present, the more common axle end grounding device structures on subways, passenger cars, and EMU vehicles are: the grounding body provides a conducting circuit for the bearing current and realizes the insulation from the axle box; the axle box cover realizes the installation of the grounding body and the axle box; friction The disk cooperates with the carbon brush located on the grounding body to provide a reliable conduction circuit for the bearing current and realize low wear; the bearing pressure plate realizes the bearing positioning and friction disk installation.

The axle box cover for subway and bus grounding devices has a metal labyrinth structure to achieve bearing sealing. The CRH1 EMU does not have a labyrinth structure on the axle box cover to achieve bearing sealing but relies on the good sealing performance of the bearing itself. The contact points of the carbon brushes of the above structures are close to the center of rotation and have the advantages of low linear speed and low wear. The above is the grounding device structure.

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From the above introduction, we can understand the composition of grounding device and grounding device structure. Grounding device is used in many places of life. Grounding device plays an important role in many fields. If you are interested in a grounding device, give You recommend an excellent grounding device supplier Sichuan Sunlight intelligent electric equipment Co., Ltd. This company strictly controls the production process of grounding devices, and the products produced are of high quality, so you can buy with confidence. If necessary, welcome to browse and purchase.