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文章根据电路理论建立了中低压电力线路载波幅频特性的物理和数学模型，通过计算机计算绘出了中低压电力线路载波幅频特性曲线，得出了中低压电力线路载波幅值随频率及距离变化的一般规律，找出了中低压电力线路载波的理想频段：３８０／２２０Ｖ线路上，当用户处无阻波器时，载波信号衰减很快，而且相邻两用户间的距离越短载波信号衰减越快；当相邻两用户间的距离为１０ｍ时，信号传送距离约２００ｍ，频段为０．１～１０ｋＨｚ；当用户处有阻波器时，载波信号衰减很小，在３０ｋｍ范围内可用频段为０．１～２００ｋＨｚ。１０ｋＶ线路上，较合适的频段为０．３～５００ｋＨｚ。
Based on the circuit theory, the paper establishes the physical and mathematical models of the amplitude-frequency characteristics of medium- and low-voltage power line carriers. The amplitude-frequency characteristics of medium- and low-voltage power line carriers are plotted by computer. The general rule of change is to find the ideal frequency band of medium and low voltage power line carrier: on 380 / 220V line, when the user has no blocker, the carrier signal decays quickly and the distance between two adjacent users is shortened. The carrier signal attenuation When the distance between two adjacent users is 10m, the signal transmission distance is about 200m and the frequency band is 0.1 to 10kHz. When the user has the wave filter, the signal attenuation of the carrier is small, and the available frequency band within the range of 30km Is 0.1 ~ 200kHz. 10kV line, the more appropriate frequency band is 0.3 ~ 500kHz.