Harmonic distortion is generally not taken into account within domestic installations and the associated wiring systems, as its potential is considered sufficiently small to be neglected. Standards to limit harmonic manifestations in the low voltage (LV) network are available, but these can be breached as a consequence of advancements in power electronics in some modern household devices contributing higher levels of harmonic distortion than permitted. While these devices individually might not be considered serious in terms of system level harmonic distortion manifestations, electrical equipment failures and insulation failures - increasingly being derived from harmonic cable heating - suggest a different story. A 10% increase in THD in a circuit will result in an increase of 10% in cable heat. Recently, attempts have been made to offer harmonic derating factors for building electrical circuit design in BS7671, but this approach currently prioritizes large power devices. This article explores the need for harmonic considerations during the design stage of electrical services engineering projects. Best practice suggestions, in the context of the dissemination of heat caused by harmonics related to household load deployments/configurations, are also provided based on the analysis conducted with real household data. This is further extended to a practical distribution network where the effect of harmonic heating at the network level is explored. The results suggest that the harmonics in the distribution network can amass to cause a cumulative effect on the network. Furthermore, it can be observed from the results that in a distribution network containing (domestic) solar photo voltaic (PV) systems, the harmonic heating issue can be reduced. This benefit is not without consequence however, as increasing PV penetration does not reduce the harmonic content of the overall system and therefore presents a further concern that may need to be addressed in due time.

中文翻译：

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随着非线性（家庭）负载和嵌入式发电的增加，智能建筑和配电网络中的谐波加热分析

在家庭安装和相关的布线系统中通常不考虑谐波失真，因为它的潜力被认为小到可以忽略不计。限制低压 (LV) 网络中谐波表现的标准是可用的，但由于一些现代家用设备中电力电子技术的进步，这些标准可能会被破坏，导致谐波失真水平高于允许水平。虽然就系统级谐波失真表现而言，这些设备单独可能不被认为是严重的，但电气设备故障和绝缘故障——越来越多地源自谐波电缆加热——表明了一个不同的故事。电路中 THD 增加 10% 将导致电缆热量增加 10%。最近，已经尝试为 BS7671 中的建筑电路设计提供谐波降额因子，但这种方法目前优先考虑大功率设备。本文探讨了在电气服务工程项目的设计阶段考虑谐波的必要性。在与家庭负载部署/配置相关的谐波引起的热量传播的背景下，还根据对真实家庭数据进行的分析提供了最佳实践建议。这进一步扩展到实际的配电网络，其中探索了网络级别的谐波加热的影响。结果表明，配电网络中的谐波可以累积，从而对网络产生累积效应。此外，从结果可以看出，在包含（家用）太阳能光伏 (PV) 系统的配电网络中，可以减少谐波加热问题。然而，这种好处并非没有后果，因为增加光伏渗透并不会减少整个系统的谐波含量，因此提出了可能需要及时解决的进一步问题。