Neutral conductor loss on the upstream network of an electrical installation, as well as unintentional islanding operation, are two critical issues directly related to the safety of both human life and equipment of the electrical installation. Furthermore, another critical issue is meter tampering, which affects the operation and development of national power sectors. The state-of-the-art methods deal with those issues separately, without providing a holistic solution; moreover, they are facing several challenges in the prospect of mass storage installations at buildings. This article introduces a new scheme for the detection of neutral loss at the upstream network, the unintentional islanding conditions, and meter tampering simultaneously. In this context, a suitable technical solution is given by using one low-power H-bridge inverter and a current transformer, along with voltage and current measuring instruments. The detection scheme is based on the injection of a (zero-sequence) 12th harmonic voltage component in series with the utility voltage and the monitoring of the corresponding harmonic current component. The theoretical analysis of the proposed technique is discussed, whereas its effectiveness is validated through simulation and experimental results.

中文翻译：

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电力装置中的中性线丢失、孤岛和电表篡改检测

电力装置上游网络的中性导体损耗以及意外孤岛操作是直接关系到电力装置的人身和设备安全的两个关键问题。此外，另一个关键问题是抄表，影响国家电力部门的运行和发展。最先进的方法单独处理这些问题，没有提供整体解决方案；此外，他们在建筑物中安装海量存储的前景面临着一些挑战。本文介绍了一种同时检测上游网络中性点丢失、无意孤岛情况和电表篡改的新方案。在此背景下，通过使用一台小功率H桥逆变器和电流互感器，以及电压和电流测量仪器，给出了合适的技术解决方案。该检测方案基于注入与市电电压串联的（零序）12 次谐波电压分量并监测相应的谐波电流分量。讨论了所提出技术的理论分析，并通过仿真和实验结果验证了其有效性。