As the core component of mobile power supply equipment, the power supply distance of the tubular conductor bar cannot be infinitely extended. In practical engineering applications, the power supply distance is constrained by multiple factors and needs to be scientifically designed according to specific working conditions. Understanding these limiting factors helps to plan the conductor bar system reasonably, ensuring the stability and safety of power transmission.

　　Voltage drop is the primary factor determining the distance of power supply. As the transmission distance increases, the voltage loss caused by line resistance will gradually accumulate. According to industry standards, it is usually required that the terminal voltage drop should not exceed 5% -10% of the rated voltage. For example, in a 380V system, the terminal voltage should not be lower than 342V. The cross-sectional area of the conductor directly affects the resistance, and the larger the cross-sectional area, the smaller the voltage drop at the same distance. Therefore, long-distance power supply often requires the selection of conductor bar with larger cross-sections or the use of power supply systems with higher voltage levels.

　　The choice of conductor material also affects the power supply distance. Copper conductors have better conductivity than aluminum alloys and can achieve longer power supply distances under the same cross-sectional area. For example, under the condition of rated current of 250A, the effective power supply distance of copper conductor  conductor bar can usually increase by 15% -20% compared to aluminum alloy conductor of the same specification. However, considering cost factors, aluminum alloy conductors still have economic advantages in medium distance applications. For particularly long power supply distances, segmented power supply can be used, and power access points can be added at appropriate locations.

　　The ambient temperature has an indirect impact on the power supply distance. The resistance of a conductor increases with temperature, and in high-temperature workshops or outdoor sunlight environments, the actual voltage drop will increase by 5% -8% compared to normal temperature conditions. Sufficient margin should be reserved during design, and if necessary, the cross-sectional area of the conductor should be increased or the power supply section should be shortened. At the same time, the heating of the conductor caused by high current will also form positive feedback, and good heat dissipation conditions can appropriately extend the effective power supply distance.

　　The contact quality of current collectors is often overlooked as a limiting factor. When supplying power over long distances, the accumulation of contact resistance from multiple collectors can exacerbate voltage loss. Keeping the pressure of the collector spring moderate and the contact surface clean can effectively reduce this loss. For power supply distances exceeding 150 meters, it is recommended to increase the number of collectors to share the current load and avoid overheating and damage to individual collectors.

　　The installation method will also change the actual power supply capacity. Aerial installation is more conducive to heat dissipation than trench laying, and can extend the power supply distance by about 10% under the same conditions. Maintain reasonable spacing between installation brackets to avoid excessive sagging and mechanical stress, as these details can affect the efficiency of electrical energy transmission. On lines with bends or slopes, the impact of additional resistance also needs to be considered.

　　Special protective requirements may shorten the available distance. In corrosive environments such as chemical and mining, the addition of protective sleeves can increase line impedance. The structural design of explosion-proof conductor bar can also result in larger voltage drops than ordinary models. These special occasions require calculating correction factors in advance, appropriately shortening the design distance or increasing the conductor specifications.

　　The maintenance condition is crucial for maintaining the design distance. Regularly checking whether the conductor connection points are oxidized and cleaning the conductive dust on the insulation surface can maintain the original electrical performance of the circuit. Recording voltage fluctuation data during operation helps to promptly detect power supply capacity degradation caused by line aging.

　　The application of modern intelligent monitoring technology provides new ideas for extending the power supply distance. Installing online voltage monitoring devices can real-time monitor the voltage status of each section of the line, and with the help of automatic voltage regulation equipment, it can compensate for voltage losses caused by distance within a certain range. This dynamic adjustment method is more flexible than traditional fixed designs.

　　Overall, the power supply distance of the tubular  conductor bar needs to be determined based on the conductor parameters, environmental conditions, and electricity demand. In conventional applications, the economic power supply distance of copper conductor  bar is usually within 200 meters, and under special designs, it can reach over 300 meters. By rational selection, optimized layout, and standardized maintenance, the power supply distance can be expanded on the premise of safety and reliability, meeting the mobile power supply needs of various industrial scenarios.