Knowledge analysis of grounding copper bar industry

The grounding copper bar is a conductor device used for equipment grounding collection in the field of power engineering. Its main function is to prevent ground potential counterattack accidents and achieve voltage equalization. This device is usually deployed at the transition position from the computer room to the front end of the ground grid, and forms an equipotential reference by connecting to the electrostatic floor voltage equalizing ring or the grounding bar of the power distribution system. In engineering practice, the application of grounding copper bars strictly follows the "Key Points of Anti-Accident Measures for Power System Relay Protection and Safety Automatic Devices" and the improvement measures for high-frequency channels for relay protection promulgated by the National Regulation Center in 1998. These specifications clearly require the laying of special grounding copper bar ring networks in switchyards and protection rooms. In actual construction, projects in different areas have certain differences in the fixing methods of copper bus brackets and the number of connection points of the main ground network. The cable shielding layer is required to be grounded at two points according to standards to offset electromagnetic interference, while communication weak current signal cables are grounded at a single point. In the grounding system, different forms of copper bar products such as Copper Busbar for Uninterrupted Power Stock and Copper Bus Bar Tapped can be selected according to specific access requirements to meet the engineering requirements of uninterruptible power systems and multi-point grounding.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In large power plants or substations where the neutral point of 220kV and above transformers is directly grounded, when a single-phase short circuit to ground occurs in the station, since the ground resistance in the station cannot be zero, the short-circuit current flowing through the ground point will generate a voltage on the resistance, and the area far away from the ground point can be approximately considered to be zero potential. Therefore, there is an uneven potential distribution from high to low on the ground grid from the ground point to the zero potential. The measured data show that when the short-circuit current flows from the center of the ground grid to the ground, there is a significant difference between the potential increase in the center of the ground grid to the remote zero point and the potential rise to the edge of the ground grid.

 

As the capacity of the power grid increases, the short-circuit current level far exceeds the assumed value in early regulations. In engineering practice, great emphasis is placed on controlling the ground resistance value below 0.5Ω, and special attention is paid to the potential distribution when a large short-circuit current enters the ground. For large grounding networks with large grounding currents, in addition to minimizing the grounding resistance, it is also necessary to take necessary voltage equalization measures to balance the potential distribution within the entire protection range. In these application scenarios, Grounding Copper Busbar and Power Distribution Bus Bar serve as the core conductors for voltage equalization and power distribution grounding. Their cross-section selection and laying path are directly related to the uniformity of the ground grid potential distribution.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In actual laying and construction, the installation process of the grounding copper bar directly affects its protective effect. It is usually required to use insulators to set up copper bars with a cross-sectional area of ​​no less than 100 mm² on the cable supports in the cable trench or protection room, and connect them end to end to form a comprehensive ring network. In order to ensure the reliability and corrosion resistance of the connection, each connection point should be crimped and tinned, and large-section insulated wires should be used to reliably connect to the main ground grid at specific grounding points. For scenarios with limited space or specific installation requirements, customized copper bars such as Backplane Bus Bar or Vertical Copper Bonding Busbar can flexibly adapt to the installation environment inside the cabinet or on the wall, providing great convenience for building a tight equipotential bonding network.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

With the development of smart grids and data centers, higher requirements have been placed on the refinement and standardization of grounding systems. In addition to the traditional switchyard and protection room ring network, special grounding components are also widely introduced in various terminal boxes, communication base stations and automation equipment. For example, Wall Mounted copper Ground Bar Kit and Earthing terminal copper busbar kit are widely used for nearby grounding of distributed equipment due to their modularity and easy installation. In some underground systems or harsh environments with extremely high anti-corrosion requirements, Tinned Copper Ground Bar for Underground System (tinned copper ground bar for underground systems) has become an ideal choice to ensure the long-term stability of the ground path due to its excellent anti-oxidation and corrosion resistance.

 

 

If you need engineering drawing confirmation, sample trial production or batch supply, please contact our technical team. We will provide a matching Copper ground Bus Bar solution based on your grounding system design and laying environment.