Analysis of Ground copper bus bar industry knowledge

Grounding bar holes are a core conductor device in the field of power engineering, mainly used for equipment grounding collection. Its core function is to prevent ground potential counterattack accidents, achieve voltage equalization protection, and provide guarantees for the safe operation of power systems. It is usually deployed from the computer room to the front end of the ground grid, forming an equipotential reference by connecting the static floor voltage equalization ring or the distribution system grounding bar. Typical specifications include telecommunications-specific 400 * 120 * 6mm copper bars, 20 air busbars (400 * 120 * 6mm), etc.

In power engineering, the application of Copper bus bars for earthing systems must strictly comply with relevant regulations, such as the "Key Points for Anti accident Measures of Power System Relay Protection and Safety Automatic Devices" and the improvement measures for high-frequency channels of relay protection issued by the National Research Center in 1998, which clearly require the laying of dedicated grounding copper bar ring networks in switch fields and protection rooms. However, in actual construction, there are regional differences in the fixing method of Earthing terminal copper busbar kit and the number of main grid connection points. In addition, the cable shielding layer needs to be grounded at two points according to the standard to offset electromagnetic interference, while communication weak current signal cables use single-point grounding to ensure the stability of equipment operation.

In power plants and substations, in order to ensure the safety of equipment and personnel, a grounding grid covering the entire plant or station needs to be arranged. All primary and secondary equipment must be connected to the grounding grid. Many major accidents in the power system are related to the performance of the grounding grid and the grounding connection of equipment. The core technical requirements of the Ground bus bar electrical panel are mainly reflected in two aspects: the voltage difference within the network and specific technical indicators. When a single-phase short circuit is grounded in the station, due to the inability of the grounding resistance to be zero, the short-circuit current will generate uneven potential on the grounding network. The farther away from the short-circuit grounding point, the greater the voltage difference, which can seriously damage equipment insulation, cause interference, and even burn cables or terminal boxes.

In terms of technical specifications for Copper ground bus bars, the original "Technical Code for Grounding Design of Power Equipment" (SDJ8-79) has clear requirements for the grounding resistance of neutral point direct grounding systems. In areas with high soil resistivity, the resistance can be relaxed to 5 Ω, but the contact potential and step potential need to be verified. After construction, the potential distribution curve needs to be measured and drawn. With the increase of power grid capacity, more attention is paid to controlling the grounding resistance below 0.5 Ω in engineering, and voltage equalization measures are taken to ensure balanced potential distribution within the protection range.

At present, secondary equipment has generally achieved computerization, which requires both a good operating environment and the ability to withstand harsh environments such as electromagnetic interference, overvoltage impact, and voltage rise in the power grid. Therefore, grounding issues are particularly critical, mainly divided into five categories: safety grounding.

For personal safety considerations, the secondary equipment cabinet and the equipment shell inside the cabinet need to be grounded to the Copper busbar for uninterruptible power stock inside the screen through a dedicated grounding wire. With the help of channel steel brackets and flat steel connections, all equipment can be connected to the ground grid; Logical grounding requires connecting the dedicated grounding potential connection position of secondary equipment (especially foreign equipment) to the grounding bar inside the screen, and in most cases, synchronously connecting the equipment casing is required.

To ensure personal and equipment safety, the grounding of analog circuits requires grounding the TA and TV circuits at one point. TVs or TAs that are electrically connected to each other should be grounded at one point in the control room, while independent circuits are usually grounded at one point on site; AC power grounding requires the use of isolation transformers to prevent equipment from being affected by lightning strikes or operating overvoltage. Automation and communication equipment can prioritize DC power supply to reduce UPS power configuration and maintenance pressure.

The grounding wire of the printer power supply inside the screen must not be connected to the Copper bus bar tapped inside the screen to prevent interference; The grounding of cable shielding layer needs to be differentiated according to different scenarios. The cables connecting primary and secondary equipment should be grounded at two points, while the cables transmitting weak current analog signals should be grounded at a single point.

At present, there are many non-standard practices in the installation of Power distribution bus bars in power plants and substations in various provinces and cities: some connect the grounding bars inside each protection screen with cables, some directly place the copper bars on cable supports or rivet them with rivets, some only connect the two ends of the copper bars to the main ground grid, and some do not directly connect the grounding bars in the on-site terminal box to the copper bars in the cable trench. It is unclear whether the copper bars in the switch field and control protection room need to be connected, and there is even a misconception that "without high-frequency protection, there is no need to lay copper bars".

In response to these issues, it is necessary to clarify the core principles of Backplane bus bar installation: strictly following industry standards, selecting fixed methods and connection points reasonably based on the actual site scenario, and balancing pressure equalization effect and construction standardization; Pay attention to the control of grounding resistance and the balance of potential distribution to avoid grounding failure caused by improper construction; Distinguish the grounding requirements of different devices and cables, eliminate interference hazards, ensure the overall stability and reliability of the grounding system, and lay a solid foundation for the safe operation of the power system. Xiamen Apollo Stamping Welding Technology Co., Ltd is deeply involved in the field of power equipment, specializing in Copper grounding bus bar products. These products strictly comply with the industry standards and technical requirements mentioned above, and can be adapted to various power scenarios such as power plants and substations, providing reliable support for grounding systems.

If you have procurement needs, technical consultation or customization requirements for Ground copper bus bars, please feel free to contact us. We will provide professional solutions and high-quality product services based on your actual scenario, and look forward to working together with you for a win-win situation.