Low-voltage power line is a wired communication channel which is very complex. Its stability is poor and the communications are extremely easy to be destroyed. In this paper, we propose a combination couphng method of a transformer and a Chebyshev band-pass filter. Then we have carefully analyzed the structure of the coupled circuits and the principles of selecting components. The point-to-point communication capabilities are tested in the laboratory and the field, respectively. The results have demonstrated that the method proposed could completely meet the energy consumption information acquisition system for electric power consumer test technology specification of National Grid. The success ratio of the communication surpasses 98％ at 110 meters distance in the field environment. At the same time, the ratio is more than 80％ at 150 meters distance. This has indicated that the coupling circuit performance can effectively satisfy automatic metering reading.%低压电力线是一种通信环境十分恶劣的有线信道,其通信的稳定性差且极易被破坏.提出一种变压器与Chebyshev带通滤波器相结合的耦合方法,分析了耦合电路的结构和元件的设计原则.分别对实验室和现场环境中点对点通信能力进行数据统计,结果显示完全满足国家电网用电信息采集系统的检验技术规范,在现场环境中距离110m的范围内通信成功率超过98%,距离150 m时也可达80%以上,这表明了依照此方法设计的耦合电路性能完全能满足集中自动抄表要求.
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