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In this paper, we have proposed a current-bypass anti-tampering algorithm for single-phase and three-phase smart meters by using a single chip solution from Analog Devices together with the proper threshold of the unbalance current difference between phase and neutral lines. Essentially, the current bypass anti-tampering algorithm is implemented to help the smart meter overcoming the tampering events of bypassing the main line and load line for both single-phase and three-phase power systems. Practically experimental results show that the proposed algorithm offers a wide dynamic range of tampering event detection, a low-probability of false detection, and a fast speed of tampering detection. Furthermore, in the case of small energy measurement, the proposed algorithm still yields a precise and accurate tampering detection capability, making it suitable for real application.

Recently, a powerline communication technology (PLC) has gained a tremendous attention to advanced metering infrastructure (AMI) systems. In this paper, narrowband and broadband PLC technologies have been experimentally examined with a smart meter. Specifically, the communication throughput and distance measurements are evaluated in several situations, including no-load and with-load situations. The experimental results indicate that the investigated broadband PLC has achieved a better performance than the narrowband PLC in terms of throughput because the broadband PLC exploits a much wider bandwidth than the narrowband PLC. In terms of distance, the broadband and narrowband PLCs have achieved a comparable performance such that they both are able to reach a maximum distance of 1.5km in the laboratory test. Therefore, the analysis presented in this paper would help in designing appropriate powerline communication network for better and efficient data transfer in AMI systems. Keywords-Powerline communication (PLC); Broadband over powerline communication (BPL); G3 powerline communication (G3-PLC); Advanced metering infrastructure (AMI)I.

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